CN110361265B - Method and device for continuously measuring characteristics of mixture of mine reaction type high polymer material and coal rock after grouting - Google Patents
Method and device for continuously measuring characteristics of mixture of mine reaction type high polymer material and coal rock after grouting Download PDFInfo
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Abstract
The invention relates to a method and a device for continuously measuring the characteristics of a coal-rock mixture after grouting a reactive polymer material for a coal mine, wherein after plastic deformation of a coal (rock) body is carried out through loading, the reactive polymer material slurry is injected into a central hole of a coal (rock) sample, the flowing condition of the reactive polymer material slurry in a secondary fracture of the coal (rock) body is simulated, and the temperature change condition of the coal (rock) body after the injection of the polymer material is comprehensively tested through a temperature measuring port arranged on a heat-insulating cylinder, so that a reliable technical means is provided for the safety application feasibility analysis of the reactive polymer material for the mine; the application effect of the injected reaction type high polymer material on the water plugging operation of the coal (rock) body is represented by measuring the permeability coefficient of the coal (rock) body after the injection of the reaction type high polymer material; the reinforcing effect of the coal (rock) body subjected to plastic deformation before and after the injection of the reactive polymer material is reflected through the comparison test of the uniaxial compressive strength of the coal (rock) body before and after the injection of the reactive polymer material.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and relates to a method and a device for continuously measuring the characteristics of a mixture of a mine reactive polymer material and coal and rock after grouting.
Background
Efficient, clean and low-carbon utilization of coal is an important part of society, and related technologies are developing toward the benefit. The clean utilization of coal is greatly promoted, which is helpful to promote the revolution of social energy production and consumption modes. Meanwhile, due to the complex geological conditions of the coal seam under the coal mine, the mines mined from a plurality of coal seam groups adopt a downward mining method, and the aim is to reduce the threat degree of gas disasters of the underlying coal seam by mining the coal seam to form the effect of pressure relief and permeability increase on the mining of the underlying coal seam. However, in the development and exploitation processes of the underlying coal seam, the roof of the underlying coal seam is usually positioned in the fissure zone due to the exploitation of the overlying coal seam, so that the stability of the surrounding rock of the roadway is poor, and the control difficulty is increased. And with the increase of the mining depth, the mining stress concentration degree formed by the mining of the overlying coal seam is higher, the mining influence range is larger, and the mining influence time is longer, so that the maintenance of the underlying coal seam roadway becomes a key problem to be solved urgently.
Aiming at the problem, at present, except for improving a roadway supporting mode, most mines adopt a process of injecting a reaction type high polymer material into a roof to reinforce the roof. The process is also widely applied to underground cross-cut coal uncovering, mining and roadway tunneling of the coal mine and prevention and control engineering of mine water damage. However, since the reactive polymer material generates a large amount of reaction heat during the curing process, whether the heat will cause spontaneous combustion of the coal is the key point for evaluating the application feasibility of the reactive polymer material. Meanwhile, whether the permeability and strength of the mixture formed by the solidified reactive polymer material and secondary fractures in the coal (rock) body meet the requirements of water plugging or reinforcement is also the key point of consideration for selecting any reactive polymer material for a mine. At present, no related testing method or device is available in the coal industry for continuously measuring the temperature, permeability and strength of a mixture of a reaction type high polymer material and coal (rock) after grouting.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for continuously measuring the temperature, permeability, and strength of a mixture of a coal mine reactive polymer material and a coal rock after grouting, which can measure the permeability and the temperature of different positions of a coal (rock) test piece after plastic deformation during the injection of the reactive polymer material, and can realize a comparison test of the strength of the coal (rock) test piece before and after the injection of the reactive polymer material, thereby providing a reliable technical means for scientific evaluation of the safety performance and the operation effect of the reactive polymer material.
One of the purposes of the invention is realized by the following technical scheme:
a method for continuously measuring the characteristics of a mixture of a mining reaction type high polymer material and coal rock after grouting comprises the following steps:
s1: cutting a coal (rock) sample collected under a coal mine into a cylinder shape; then, drilling a hole in the center of the coal (rock) sample along the axial direction, and penetrating the coal (rock) sample;
s2: placing the prepared torus coal (rock) sample on a steel bottom plate, wrapping the coal (rock) sample in the circumferential direction by using a heat-insulating cylinder, placing a steel top cover plate on the top of the coal (rock) sample, placing a spring in a central drilling hole of the coal (rock) sample, and then integrally placing the coal (rock) sample on a pressurizing device;
s3: starting a pressurizing device to gradually apply axial stress to the coal (rock) sample, stopping pressurizing after a stress-strain curve of the coal (rock) sample reaches a peak value through observation, and recording the axial stress value at the moment;
s4: connecting a temperature measuring port on the heat-insulating cylinder with a temperature sensor, pouring the prepared reactive polymer material slurry into a central drill hole of a coal (rock) sample, and forming a constraint boundary on the reactive polymer material in the central drill hole by using a hardboard;
s5: recording the readings of the temperature sensors on the temperature measurement ports until the reading change of the temperature sensors within 120min is less than 0.5 ℃;
s6: after the temperature test is finished, taking out the coal (rock) sample, removing the polymer material and the spring which are reacted and cured in the central hole of the coal (rock) sample, uniformly coating the epoxy resin on the lower end surface of the coal (rock) sample, then bonding the sealing rubber mat and the epoxy resin layer, and placing the sealing rubber mat on the bottom plate of the infiltration cylinder body; connecting and fastening the bottom plate of the infiltration cylinder body and the annular sealing barrel by using bolts;
s7: uniformly coating epoxy resin on the upper end surface of a coal (rock) sample, then bonding a sealing rubber mat with an epoxy resin layer, placing a top plate of a permeable cylinder body on the epoxy resin layer, and connecting and fastening the top plate of the permeable cylinder body with an annular sealing barrel by using bolts;
s8: opening a valve at the air inlet end, communicating the air inlet with a high-pressure helium gas source, and adjusting the pressure of helium gas to be a preset value; then opening a valve at the gas outlet end, enabling the high-pressure helium to flow to the gas outlet end through the coal (rock) sample annular entity under the action of the pressure difference between the gas inlet end and the gas outlet end, reading the numerical value of a flow meter at the gas outlet end, recording the gas flow of the helium at the moment after the numerical value is stable, and further obtaining the corresponding numerical value of the permeability coefficient;
s9: after the permeability coefficient of the coal (rock) sample is tested, the bolts and the annular sealing barrel of the top plate and the bottom plate of the permeation cylinder body are dismounted, and a blade is used for scraping the sealing rubber gasket; and then placing the coal (rock) sample on a steel bottom plate, arranging the steel bottom plate with the coal (rock) sample under the pressurizing device, then opening the pressurizing device, and repeating S3 to finish the test.
Further, step S1 specifically includes the following steps:
s11: cutting a coal (rock) sample collected in a coal mine into a cylinder with the diameter of 200mm and the height of 400mm, polishing the end face and the annular surface of the coal (rock) sample by using abrasive paper, measuring the distances in four orthogonal directions of the center of the end face by using a vernier caliper by taking the center of the end face of the coal (rock) sample as a reference, and if the deviation of any two tests is less than 0.5mm, the size of the coal (rock) sample meets the test requirements;
s12: the coring device is used for coring the prepared cylindrical coal (rock) sample with the diameter of 200mm and the height of 400mm along the axial direction at the center of the coal (rock) sample, so that a drill hole with the diameter of 40mm is formed in the center of the cylindrical coal (rock) sample, and the coring depth is equal to the height of the coal (rock) sample.
Further, step S2 specifically includes the following steps:
s21: the steel bottom plate is provided with a circular groove with the diameter slightly larger than the outer diameter of the coal (rock) sample for positioning the coal (rock) sample; the heat-insulating cylinder is made of polystyrene foam and has the function of isolating the temperature of the coal (rock) sample from the outside after the reactive polymer material is injected; the steel top cover plate is annular, the inner diameter of the steel top cover plate is slightly smaller than the inner diameter of the coal (rock) sample, and the outer diameter of the steel top cover plate is slightly larger than the outer diameter of the coal (rock) sample;
s22: the spring is placed in the central hole of the coal (rock) sample, the outer diameter of the spring is equal to the inner diameter of the steel top cover plate, the height of the spring is flush with the upper surface of the steel top cover plate, the compression deformation of a certain degree is generated in the process of pressurizing the coal (rock) sample by the pressurizing device, the spring is also subjected to compression deformation, and the compression deformation enables the gap between the ring of the spring and the ring to be reduced, so that the coal (rock) scraps on the inner surface of the coal (rock) sample are prevented from falling off.
Further, step S4 specifically includes the following steps:
s41: after recording the axial stress value when the stress-strain curve reaches the peak value, removing the steel top cover plate; connecting a temperature measuring port arranged on the heat-insulating cylinder with a temperature sensor; the temperature measurement ports are arranged one at every 60 degrees by taking the center of the coal (rock) sample as a reference, and six ports are used as a group; arranging one group at every 50mm by taking a plane which is 50mm away from the end face as a reference along the axial direction of the coal (rock) sample; the temperature sensor is an ultrasonic temperature sensor, but is not limited to the temperature sensor;
s42: injecting a certain amount of reactive polymer material slurry into the central hole of the coal (rock) sample, and covering the upper end surface of the coal (rock) sample by using a hardboard to prevent the polymer material slurry injected into the central hole from overflowing due to expansion.
Further, step S5 specifically includes the following steps:
s51: starting the temperature sensors immediately after the high polymer material slurry is injected, and recording the readings and the corresponding moments of each temperature sensor at intervals of 10 s;
s52: stopping recording the readings of the temperature sensor until the reading change of the temperature sensor is less than 0.5 ℃ within 120 min; and observing whether the temperature of each test point in the coal (rock) sample exceeds 140 ℃ specified in AQ1089-2011, wherein if the temperature exceeds the temperature, the reactive polymer material does not meet the requirements of engineering application.
Further, step S6 specifically includes the following steps:
s61: after the temperature test is finished, coring the coal (rock) sample by using a coring device at the central position of the coal (rock) sample along the axial direction, removing the polymer material which is reacted and solidified in the central hole of the coal (rock) sample, and forming a drill hole with the diameter of 40mm at the center of the polymer material; uniformly coating epoxy resin on the lower end face of the coal (rock) sample, and bonding the sealing rubber mat with the epoxy resin layer; the epoxy resin is used for sealing the lower end face of the coal (rock) sample, so that the test result is prevented from being influenced by the outflow of test gas from the lower end face in the process of measuring the permeability coefficient of the coal (rock) sample; the sealing rubber pad is made of rubber and is in a step disc shape, the small diameter of the sealing rubber pad is equal to the diameter of the circular groove on the bottom plate of the infiltration cylinder body, and the large diameter of the sealing rubber pad is larger than the small diameter; a cylinder with the height larger than the sum of the thickness of the sealing rubber mat and the height of the coal (rock) sample is arranged in the center of the bottom plate of the infiltration cylinder body, and dense openings are formed in the cylinder to ensure that gas enters the coal (rock) sample from the openings of the cylinder;
s62: the two ends of the infiltration cylinder body bottom plate and the two ends of the annular sealing barrel are respectively provided with a corresponding flange, bolt holes are formed in the flanges, the infiltration cylinder body bottom plate and the annular sealing barrel are fastened through bolts, and the outer edge of the sealing rubber mat is extruded to seal the bottom end face of the coal (rock) sample; be equipped with the sieve mesh on the annular seal bucket inlayer, and the annular seal bucket internal diameter is greater than the external diameter of coal (rock) appearance for test gas flows its annular surface via coal (rock) appearance centre bore, through the sieve mesh, and flows by the gas outlet that sets up on the annular seal bucket outer wall.
Further, step S7 specifically includes the following steps:
s71: uniformly coating epoxy resin on the upper end surface of the coal (rock) sample, and bonding the sealing rubber mat with the epoxy resin layer; the epoxy resin is used for sealing the upper end face of the coal (rock) sample, so that the test result is prevented from being influenced by the outflow of test gas from the upper end face in the process of measuring the permeability coefficient of the coal (rock) sample;
s72: the top plate of the permeation cylinder body and the bottom plate of the permeation cylinder body have the same size, and the upper part of the top plate of the permeation cylinder body is provided with an air inlet for providing a channel for the flow of test gas; and connecting and fastening the top plate of the infiltration cylinder body and the annular sealing barrel by bolts.
Further, step S8 specifically includes the following steps:
s81: the valve at the air inlet end is arranged on an air inlet pipeline, and the air inlet pipeline is connected with an air inlet on a top plate of the infiltration cylinder body; opening a valve at the air inlet end and connecting a high-pressure helium gas source; the high-pressure helium gas source has no physical and chemical reaction with the coal (rock) body, so that the gas is applied to test the permeability coefficient of the coal (rock) body to reflect the flow resistance property of the gas source to the medium;
s82: the high-pressure helium gas source is connected with the gas inlet pipeline through a pressure reducing valve and is used for controlling the pressure value of the helium gas at the gas inlet end of the coal (rock) sample;
s83: adjusting the pressure reducing valve to enable the pressure value of helium gas at the gas inlet end to meet the test requirement, then opening a valve at the gas outlet end, and recording the value of a flowmeter at the gas outlet end; the gas outlet end flowmeter is a mass flowmeter, but is not limited to the flowmeter;
s84: when the flow meter reading of the gas outlet end is within 1h continuously and the relative deviation is less than 1%, indicating that the flow of the helium gas reaches a stable state, immediately recording the gas flow of the helium gas at the moment, and further acquiring a corresponding permeability coefficient value; the permeability coefficient of the coal (rock) sample is calculated according to the following formula:
in the formula: q is the flow rate of helium per unit area, m3/(m2.d)；R1Is the inner diameter of the coal (rock) sample, m; r0Is the outer diameter of the coal (rock) sample, m; p is a radical of0The pressure of helium gas at the gas inlet end of the coal (rock) sample is MPa; p is a radical of1The helium gas pressure at the gas outlet end of the coal (rock) sample is MPa; lambda is the permeability coefficient of coal (rock) sample, m2/(MPa2.d)。
Further, step S9 specifically includes the following steps:
s91: after the permeability coefficient of the coal (rock) sample is tested, the bolts and the annular sealing barrel of the top plate and the bottom plate of the permeation cylinder body are dismounted, and a blade is used for scraping the sealing rubber gasket;
s92: placing the coal (rock) sample on a steel bottom plate, arranging the steel bottom plate with the coal (rock) sample under a pressurizing device, then starting the pressurizing device, repeating S3 until the stress-strain curve of the coal (rock) sample reaches the peak value, stopping pressurizing, and recording the axial stress at the moment;
s93: judging the effect of the polymer material on reinforcement by comparing the axial stress when the stress-strain curve of the coal (rock) sample before and after the injection of the reactive polymer material reaches the peak value; if the axial stress when the stress-strain curve of the coal (rock) sample after the injection of the reactive polymer material reaches the peak value is larger than that before the injection, the polymer material has obvious effective effect on reinforcement, otherwise, the stress-strain curve is not.
On the other hand, the invention provides a device for continuously measuring the characteristics of a mixture of a mine reaction type high polymer material and coal and rock after grouting, which comprises a cylindrical coal (rock) sample, wherein a drill hole penetrates through the center of the cylindrical coal (rock) sample along the axial direction, a steel bottom plate is arranged at the bottom of the coal (rock) sample, a steel top cover plate is arranged at the top of the coal (rock) sample, a spring is arranged in the drill hole, and the drill hole is filled with high polymer material slurry and a hard board for restraining the boundary of the high polymer material slurry; still including the heat preservation drum that is used for wrapping up coal (rock) appearance outer wall, be equipped with a plurality of temperature measurement ports on the heat preservation drum to and the temperature sensor who is connected with the temperature measurement port, still including be used for to coal (rock) appearance applys axial stress's press, the press can show axial stress numerical value and stress-strain curve.
Through this device, temperature and the intensity characteristic of detectable mining macromolecular material post-grouting and coal petrography mixture are specifically as follows:
axial stress is gradually applied to the coal (rock) sample by starting the press, the pressurizing can be stopped after the stress-strain curve of the coal (rock) sample reaches the peak value by observation, and the axial stress value at the moment is recorded so as to detect the strength characteristic.
After injecting the high polymer material slurry, starting the temperature sensors, and recording the readings and the corresponding moments of each temperature sensor at intervals of 10 s; and stopping recording the readings of the temperature sensor until the reading change of the temperature sensor is less than 0.5 ℃ within 120min continuously. And observing whether the temperature of each test point in the coal (rock) sample exceeds 140 ℃ specified in AQ1089-2011, wherein if the temperature exceeds the temperature, the reactive polymer material does not meet the requirements of engineering application.
On the other hand, the invention provides a device for continuously measuring the characteristics of a mixture of a mining reaction type high polymer material and coal and rock after grouting, which comprises an annular sealing barrel and a cylindrical coal (rock) sample in the annular sealing barrel, wherein a drill hole penetrates through the center of the cylindrical coal (rock) sample along the axial direction, epoxy resin layers are arranged on the upper end surface and the lower end surface of the coal (rock) sample, sealing rubber gaskets are bonded on the epoxy resin layers on the two surfaces, the sealing rubber gasket on the lower end surface is connected with a permeation cylinder body bottom plate, the upper end surface is connected with a permeation cylinder body top plate, and the annular sealing barrel is connected with the permeation cylinder body bottom plate and the permeation cylinder body top plate in a sealing manner; the annular sealing barrel comprises an inner layer and an outer layer, wherein the inner layer is provided with sieve pores, the outer layer is provided with an air outlet, the air outlet is connected with an air outlet pipeline, and the air outlet pipeline is provided with an air outlet end valve and an air outlet end flowmeter; a cylindrical pipeline penetrating through the drilled hole is arranged in the middle of the bottom plate of the infiltration cylinder body, and dense holes are formed in the cylindrical pipeline; the center of the top plate of the infiltration cylinder body is provided with an air inlet communicated with the drill hole and the outside and connected with an air inlet pipeline, the air inlet pipeline is provided with an air inlet end valve and a pressure reducing valve, and the air inlet pipeline is connected with a high-pressure helium gas source.
Through this device, the permeability characteristic of detectable mining macromolecular material post-grouting and coal petrography mixture is as follows specifically:
the high-pressure helium gas source has no physical and chemical reaction with the coal (rock) body, so that the gas can truly and objectively reflect the flow resistance property of the gas source to the medium by applying the gas to test the permeability coefficient of the coal (rock) body; the high-pressure helium gas source is connected with the gas inlet pipeline through a pressure reducing valve and is used for controlling the pressure value of the helium gas at the gas inlet end of the coal (rock) sample; adjusting the pressure reducing valve to enable the pressure value of helium gas at the gas inlet end to meet the test requirement, then opening a valve at the gas outlet end, and recording the value of a flowmeter at the gas outlet end; the gas outlet end flowmeter is a mass flowmeter, but is not limited to the flowmeter; when the flow meter reading of the gas outlet end is within 1h continuously and the relative deviation is less than 1%, the flow of the helium gas can be considered to reach a stable state, the gas flow of the helium gas at the moment is recorded immediately, and then a corresponding permeability coefficient value can be obtained; the permeability coefficient of the coal (rock) sample is calculated according to the following formula:
in the formula: q is the flow rate of helium per unit area, m3/(m2.d)；R1Is the inner diameter of the coal (rock) sample, m; r0Is the outer diameter of the coal (rock) sample, m; p is a radical of0The pressure of helium gas at the gas inlet end of the coal (rock) sample is MPa; p is a radical of1The helium gas pressure at the gas outlet end of the coal (rock) sample is MPa; lambda is the permeability coefficient of coal (rock) sample, m2/(MPa2.d)。
The invention has the beneficial effects that:
the invention discloses a method and a device for continuously measuring the temperature, permeability and strength of a mixture of a coal mine reaction type high polymer material and a coal rock after grouting, wherein the coal (rock) body is subjected to plastic deformation through loading, the reaction type high polymer material slurry is injected into a central hole of a coal (rock) sample, the flowing condition of the reaction type high polymer material slurry in a secondary fracture of the coal (rock) body is simulated, and the temperature change condition of the coal (rock) body after the high polymer material is injected is comprehensively tested through a temperature measuring port arranged on a heat-insulating cylinder, so that a reliable technical means can be provided for the safety application feasibility analysis of the mine reaction type high polymer material; the application effect of the injected reaction type high polymer material on the water plugging operation of the coal (rock) body is accurately represented by measuring the permeability coefficient of the coal (rock) body after the injection of the reaction type high polymer material; through the comparison test of the uniaxial compressive strength of the coal (rock) body before and after the injection of the reaction type high polymer material, the reinforcing effect of the coal (rock) body subjected to plastic deformation before and after the injection of the reaction type high polymer material can be truly and objectively reflected, and a technical support is provided for evaluating the safety performance and application effect of operations of top plate reinforcement, water plugging and the like implemented by the injection of the reaction type high polymer material.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a device for continuously measuring temperature and strength of a mixture of a mining reactive polymer material and coal rock after grouting;
FIG. 2 is a schematic structural diagram of a device for continuously measuring the permeability of a mixture of a mining reactive polymer material and coal rock after grouting.
Reference numerals: 1-coal (rock) sample; 2-a heat preservation cylinder; 3-a spring; 4-a temperature measurement port; 5-a steel top cover plate; 6-a steel bottom plate; 7-infiltrating the bottom plate of the cylinder body; 8-ring-shaped sealing barrel; a 9-epoxy resin layer; 10-sealing the rubber mat; 11-infiltrating the cylinder top plate; 12-a gas outlet pipeline; 13-an air intake line; 14-inlet valve; 15-a pressure reducing valve; 16-an outlet end flowmeter; 17-an air inlet; 18-air outlet.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
On one hand, the method for continuously measuring the characteristics of the mixture of the mining reactive polymer material and the coal rock after grouting comprises the following steps:
s1: cutting a coal (rock) sample collected under a coal mine into a cylinder shape; then, drilling a hole in the center of the coal (rock) sample along the axial direction, and penetrating the coal (rock) sample;
s2: placing the prepared torus coal (rock) sample on a steel bottom plate, wrapping the coal (rock) sample in the circumferential direction by using a heat-insulating cylinder, placing a steel top cover plate on the top of the coal (rock) sample, placing a spring in a central drilling hole of the coal (rock) sample, and then integrally placing the coal (rock) sample on a pressurizing device;
s3: starting a pressurizing device to gradually apply axial stress to the coal (rock) sample, stopping pressurizing after a stress-strain curve of the coal (rock) sample reaches a peak value through observation, and recording the axial stress value at the moment;
s4: connecting a temperature measuring port on the heat-insulating cylinder with a temperature sensor, pouring the prepared reactive polymer material slurry into a central drill hole of a coal (rock) sample, and forming a constraint boundary on the reactive polymer material in the central drill hole by using a hardboard;
s5: recording the readings of the temperature sensors on the temperature measurement ports until the reading change of the temperature sensors within 120min is less than 0.5 ℃;
s6: after the temperature test is finished, taking out the coal (rock) sample, removing the polymer material and the spring which are reacted and cured in the central hole of the coal (rock) sample, uniformly coating the epoxy resin on the lower end surface of the coal (rock) sample, then bonding the sealing rubber mat and the epoxy resin layer, and placing the sealing rubber mat on the bottom plate of the infiltration cylinder body; connecting and fastening the bottom plate of the infiltration cylinder body and the annular sealing barrel by using bolts;
s7: uniformly coating epoxy resin on the upper end surface of a coal (rock) sample, then bonding a sealing rubber mat with an epoxy resin layer, placing a top plate of a permeable cylinder body on the epoxy resin layer, and connecting and fastening the top plate of the permeable cylinder body with an annular sealing barrel by using bolts;
s8: opening a valve at the air inlet end, communicating the air inlet with a high-pressure helium gas source, and adjusting the pressure of helium gas to be a preset value; then opening a valve at the gas outlet end, enabling the high-pressure helium to flow to the gas outlet end through the coal (rock) sample annular entity under the action of the pressure difference between the gas inlet end and the gas outlet end, reading the numerical value of a flow meter at the gas outlet end, recording the gas flow of the helium at the moment after the numerical value is stable, and further obtaining the corresponding numerical value of the permeability coefficient;
s9: after the permeability coefficient of the coal (rock) sample is tested, the bolts and the annular sealing barrel of the top plate and the bottom plate of the permeation cylinder body are dismounted, and a blade is used for scraping the sealing rubber gasket; and then placing the coal (rock) sample on a steel bottom plate, arranging the steel bottom plate with the coal (rock) sample under the pressurizing device, then opening the pressurizing device, and repeating S3 to finish the test.
Step S1 specifically includes the following steps:
s11: cutting a coal (rock) sample collected in a coal mine into a cylinder with the diameter of 200mm and the height of 400mm, polishing the end face and the annular surface of the coal (rock) sample by using abrasive paper, measuring the distances in four orthogonal directions of the center of the end face by using a vernier caliper by taking the center of the end face of the coal (rock) sample as a reference, and if the deviation of any two tests is less than 0.5mm, the size of the coal (rock) sample meets the test requirements;
s12: the coring device is used for coring the prepared cylindrical coal (rock) sample with the diameter of 200mm and the height of 400mm along the axial direction at the center of the coal (rock) sample, so that a drill hole with the diameter of 40mm is formed in the center of the cylindrical coal (rock) sample, and the coring depth is equal to the height of the coal (rock) sample.
Step S2 specifically includes the following steps:
s21: the steel bottom plate is provided with a circular groove with the diameter slightly larger than the outer diameter of the coal (rock) sample for positioning the coal (rock) sample; the heat-insulating cylinder is made of polystyrene foam and has the function of isolating the temperature of the coal (rock) sample from the outside after the reactive polymer material is injected; the steel top cover plate is annular, the inner diameter of the steel top cover plate is slightly smaller than the inner diameter of the coal (rock) sample, and the outer diameter of the steel top cover plate is slightly larger than the outer diameter of the coal (rock) sample;
s22: the spring is placed in the central hole of the coal (rock) sample, the outer diameter of the spring is equal to the inner diameter of the steel top cover plate, the height of the spring is flush with the upper surface of the steel top cover plate, the compression deformation of a certain degree is generated in the process of pressurizing the coal (rock) sample by the pressurizing device, the spring is also subjected to compression deformation, and the compression deformation enables the gap between the ring of the spring and the ring to be reduced, so that the coal (rock) scraps on the inner surface of the coal (rock) sample are prevented from falling off.
Step S4 specifically includes the following steps:
s41: after recording the axial stress value when the stress-strain curve reaches the peak value, removing the steel top cover plate; connecting a temperature measuring port arranged on the heat-insulating cylinder with a temperature sensor; the temperature measurement ports are arranged one at every 60 degrees by taking the center of the coal (rock) sample as a reference, and six ports are used as a group; arranging one group at every 50mm by taking a plane which is 50mm away from the end face as a reference along the axial direction of the coal (rock) sample; the temperature sensor is an ultrasonic temperature sensor, but is not limited to the temperature sensor;
s42: injecting a certain amount of reactive polymer material slurry into the central hole of the coal (rock) sample, and covering the upper end surface of the coal (rock) sample by using a hardboard to prevent the polymer material slurry injected into the central hole from overflowing due to expansion.
Step S5 specifically includes the following steps:
s51: starting the temperature sensors immediately after the high polymer material slurry is injected, and recording the readings and the corresponding moments of each temperature sensor at intervals of 10 s;
s52: stopping recording the readings of the temperature sensor until the reading change of the temperature sensor is less than 0.5 ℃ within 120 min; and observing whether the temperature of each test point in the coal (rock) sample exceeds 140 ℃ specified in AQ1089-2011, wherein if the temperature exceeds the temperature, the reactive polymer material does not meet the requirements of engineering application.
Step S6 specifically includes the following steps:
s61: after the temperature test is finished, coring the coal (rock) sample by using a coring device at the central position of the coal (rock) sample along the axial direction, removing the polymer material which is reacted and solidified in the central hole of the coal (rock) sample, and forming a drill hole with the diameter of 40mm at the center of the polymer material; uniformly coating epoxy resin on the lower end face of the coal (rock) sample, and bonding the sealing rubber mat with the epoxy resin layer; the epoxy resin is used for sealing the lower end face of the coal (rock) sample, so that the test result is prevented from being influenced by the outflow of test gas from the lower end face in the process of measuring the permeability coefficient of the coal (rock) sample; the sealing rubber pad is made of rubber and is in a step disc shape, the small diameter of the sealing rubber pad is equal to the diameter of the circular groove on the bottom plate of the infiltration cylinder body, and the large diameter of the sealing rubber pad is larger than the small diameter; a cylinder with the height larger than the sum of the thickness of the sealing rubber mat and the height of the coal (rock) sample is arranged in the center of the bottom plate of the infiltration cylinder body, and dense openings are formed in the cylinder to ensure that gas enters the coal (rock) sample from the openings of the cylinder;
s62: the two ends of the infiltration cylinder body bottom plate and the two ends of the annular sealing barrel are respectively provided with a corresponding flange, bolt holes are formed in the flanges, the infiltration cylinder body bottom plate and the annular sealing barrel are fastened through bolts, and the outer edge of the sealing rubber mat is extruded to seal the bottom end face of the coal (rock) sample; be equipped with the sieve mesh on the annular seal bucket inlayer, and the annular seal bucket internal diameter is greater than the external diameter of coal (rock) appearance for test gas flows its annular surface via coal (rock) appearance centre bore, through the sieve mesh, and flows by the gas outlet that sets up on the annular seal bucket outer wall.
Step S7 specifically includes the following steps:
s71: uniformly coating epoxy resin on the upper end surface of the coal (rock) sample, and bonding the sealing rubber mat with the epoxy resin layer; the epoxy resin is used for sealing the upper end face of the coal (rock) sample, so that the test result is prevented from being influenced by the outflow of test gas from the upper end face in the process of measuring the permeability coefficient of the coal (rock) sample;
s72: the top plate of the permeation cylinder body and the bottom plate of the permeation cylinder body have the same size, and the upper part of the top plate of the permeation cylinder body is provided with an air inlet for providing a channel for the flow of test gas; and connecting and fastening the top plate of the infiltration cylinder body and the annular sealing barrel by bolts.
Step S8 specifically includes the following steps:
s81: the valve at the air inlet end is arranged on an air inlet pipeline, and the air inlet pipeline is connected with an air inlet on a top plate of the infiltration cylinder body; opening a valve at the air inlet end and connecting a high-pressure helium gas source; the high-pressure helium gas source has no physical and chemical reaction with the coal (rock) body, so that the gas is applied to test the permeability coefficient of the coal (rock) body to reflect the flow resistance property of the gas source to the medium;
s82: the high-pressure helium gas source is connected with the gas inlet pipeline through a pressure reducing valve and is used for controlling the pressure value of the helium gas at the gas inlet end of the coal (rock) sample;
s83: adjusting the pressure reducing valve to enable the pressure value of helium gas at the gas inlet end to meet the test requirement, then opening a valve at the gas outlet end, and recording the value of a flowmeter at the gas outlet end; the gas outlet end flowmeter is a mass flowmeter, but is not limited to the flowmeter;
s84: when the flow meter reading of the gas outlet end is within 1h continuously and the relative deviation is less than 1%, indicating that the flow of the helium gas reaches a stable state, immediately recording the gas flow of the helium gas at the moment, and further acquiring a corresponding permeability coefficient value; the permeability coefficient of the coal (rock) sample is calculated according to the following formula:
in the formula: q is the flow rate of helium per unit area, m3/(m2.d)；R1Is the inner diameter of the coal (rock) sample, m; r0Is the outer diameter of the coal (rock) sample, m; p is a radical of0The pressure of helium gas at the gas inlet end of the coal (rock) sample is MPa; p is a radical of1The helium gas pressure at the gas outlet end of the coal (rock) sample is MPa; lambda is the permeability coefficient of coal (rock) sample, m2/(MPa2.d)。
Step S9 specifically includes the following steps:
s91: after the permeability coefficient of the coal (rock) sample is tested, the bolts and the annular sealing barrel of the top plate and the bottom plate of the permeation cylinder body are dismounted, and a blade is used for scraping the sealing rubber gasket;
s92: placing the coal (rock) sample on a steel bottom plate, arranging the steel bottom plate with the coal (rock) sample under a pressurizing device, then starting the pressurizing device, repeating S3 until the stress-strain curve of the coal (rock) sample reaches the peak value, stopping pressurizing, and recording the axial stress at the moment;
s93: judging the effect of the polymer material on reinforcement by comparing the axial stress when the stress-strain curve of the coal (rock) sample before and after the injection of the reactive polymer material reaches the peak value; if the axial stress when the stress-strain curve of the coal (rock) sample after the injection of the reactive polymer material reaches the peak value is larger than that before the injection, the polymer material has obvious effective effect on reinforcement, otherwise, the stress-strain curve is not.
On the other hand, as shown in fig. 1, the invention provides a device for continuously measuring the characteristics of a mixture of a mining reaction type polymer material and coal and rock after grouting, which comprises a cylindrical coal (rock) sample 1, wherein a drill hole penetrates through the center of the cylindrical coal (rock) sample 1 along the axial direction, a steel bottom plate 6 is arranged at the bottom of the coal (rock) sample 1, a steel top cover plate 5 is arranged at the top of the coal (rock) sample, a spring 3 is arranged in the drill hole, and polymer material slurry and a hard board for restricting the boundary of the drill hole are filled in the drill hole; still including the heat preservation drum 2 that is used for wrapping up 1 outer wall of coal (rock) appearance, be equipped with a plurality of temperature measurement ports 4 on the heat preservation drum 2 to and the temperature sensor who is connected with temperature measurement port 4, still including be used for to coal (rock) appearance 1 applys axial stress's press, the press can show axial stress numerical value and stress-strain curve.
Through this device, temperature and the intensity characteristic of detectable mining macromolecular material post-grouting and coal petrography mixture are specifically as follows:
axial stress is gradually applied to the coal (rock) sample by starting the press, the pressurizing can be stopped after the stress-strain curve of the coal (rock) sample reaches the peak value by observation, and the axial stress value at the moment is recorded so as to detect the strength characteristic.
After injecting the high polymer material slurry, starting the temperature sensors, and recording the readings and the corresponding moments of each temperature sensor at intervals of 10 s; and stopping recording the readings of the temperature sensor until the reading change of the temperature sensor is less than 0.5 ℃ within 120min continuously. And observing whether the temperature of each test point in the coal (rock) sample exceeds 140 ℃ specified in AQ1089-2011, wherein if the temperature exceeds the temperature, the reactive polymer material does not meet the requirements of engineering application.
On the other hand, as shown in fig. 2, the invention provides a device for continuously measuring the characteristics of a coal-rock mixture after grouting a mining reactive polymer material, which comprises an annular sealing barrel 8 and a cylindrical coal (rock) sample 1 in the annular sealing barrel 8, wherein a drill hole penetrates through the center of the cylindrical coal (rock) sample 1 along the axial direction, epoxy resin layers 9 are arranged on the upper end surface and the lower end surface of the coal (rock) sample, sealing rubber pads 10 are bonded on the epoxy resin layers 9 on the two surfaces, the sealing rubber pad 10 on the lower end surface is connected with a permeation cylinder body bottom plate 7, the upper end surface is connected with a permeation cylinder body top plate 11, and the annular sealing barrel is hermetically connected with the permeation cylinder body bottom plate 7 and the permeation cylinder body top plate 11; the annular sealing barrel comprises an inner layer and an outer layer, wherein the inner layer is provided with sieve pores, the outer layer is provided with an air outlet 18, the air outlet is connected with an air outlet pipeline 12, and the air outlet pipeline 12 is provided with an air outlet end valve and an air outlet end flowmeter 16; a cylindrical pipeline penetrating through the drilled hole is arranged in the middle of the bottom plate 7 of the infiltration cylinder body, and dense holes are formed in the cylindrical pipeline; the center of the top plate 11 of the infiltration cylinder body is provided with an air inlet 17 communicated with the drill hole and the outside and connected with an air inlet pipeline 13, the air inlet pipeline 13 is provided with an air inlet end valve 14 and a pressure reducing valve 15, and the air inlet pipeline 13 is connected with a high-pressure helium gas source.
Through this device, the permeability characteristic of detectable mining macromolecular material post-grouting and coal petrography mixture is as follows specifically:
the high-pressure helium gas source has no physical and chemical reaction with the coal (rock) body, so that the gas can truly and objectively reflect the flow resistance property of the gas source to the medium by applying the gas to test the permeability coefficient of the coal (rock) body; the high-pressure helium gas source is connected with the gas inlet pipeline through a pressure reducing valve and is used for controlling the pressure value of the helium gas at the gas inlet end of the coal (rock) sample; adjusting the pressure reducing valve to enable the pressure value of helium gas at the gas inlet end to meet the test requirement, then opening a valve at the gas outlet end, and recording the value of a flowmeter at the gas outlet end; the gas outlet end flowmeter is a mass flowmeter, but is not limited to the flowmeter; when the flow meter reading of the gas outlet end is within 1h continuously and the relative deviation is less than 1%, the flow of the helium gas can be considered to reach a stable state, the gas flow of the helium gas at the moment is recorded immediately, and then a corresponding permeability coefficient value can be obtained; the permeability coefficient of the coal (rock) sample is calculated according to the following formula:
in the formula: q is the flow rate of helium per unit area, m3/(m2.d)；R1Is the inner diameter of the coal (rock) sample, m; r0Is the outer diameter of the coal (rock) sample, m; p is a radical of0The pressure of helium gas at the gas inlet end of the coal (rock) sample is MPa; p is a radical of1The helium gas pressure at the gas outlet end of the coal (rock) sample is MPa; lambda is the permeability coefficient of coal (rock) sample, m2/(MPa2.d)。
According to the method and the device for continuously measuring the temperature, the permeability and the strength of the mixture of the coal mine reaction type high polymer material and the coal rock after grouting, after the coal (rock) body is subjected to plastic deformation through loading, the reaction type high polymer material slurry is injected into the central hole of the coal (rock) sample, the flowing condition of the reaction type high polymer material slurry in the secondary fracture of the coal (rock) body is simulated, and the temperature change condition of the coal (rock) body after the high polymer material is injected is comprehensively tested through the temperature measuring port arranged on the heat preservation cylinder, so that a reliable technical means can be provided for the safety application feasibility analysis of the mine reaction type high polymer material; the application effect of the injected reaction type high polymer material on the water plugging operation of the coal (rock) body is accurately represented by measuring the permeability coefficient of the coal (rock) body after the injection of the reaction type high polymer material; through the comparison test of the uniaxial compressive strength of the coal (rock) body before and after the injection of the reaction type high polymer material, the reinforcing effect of the coal (rock) body subjected to plastic deformation before and after the injection of the reaction type high polymer material can be truly and objectively reflected, and a technical support is provided for evaluating the safety performance and application effect of operations of top plate reinforcement, water plugging and the like implemented by the injection of the reaction type high polymer material.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A method for continuously measuring the characteristics of a mixture of a mining reaction type high polymer material and coal rock after grouting is characterized by comprising the following steps: the method comprises the following steps:
s1: cutting a coal sample or a rock sample collected under a coal mine into a cylindrical shape; then, drilling a hole in the center of the coal sample or the rock sample along the axial direction, and penetrating through the coal sample or the rock sample;
s2: placing the prepared circular ring-shaped coal sample or rock sample on a steel bottom plate, wrapping the coal sample or rock sample in the circumferential direction by using a heat-insulating cylinder, placing a steel top cover plate on the top of the coal sample or rock sample, placing a spring in a central drilling hole of the coal sample or rock sample, and then integrally placing the spring on a pressurizing device;
s3: starting a pressurizing device to gradually apply axial stress to the coal sample or the rock sample, stopping pressurizing after a stress-strain curve of the coal sample or the rock sample reaches a peak value through observation, and recording the axial stress value at the moment;
s4: connecting a temperature measuring port on the heat-insulating cylinder with a temperature sensor, pouring the prepared reactive polymer material slurry into a central drill hole of a coal sample or a rock sample, and forming a constraint boundary on the reactive polymer material in the central drill hole by using a hardboard;
s41: after recording the axial stress value when the stress-strain curve reaches the peak value, removing the steel top cover plate; connecting a temperature measuring port arranged on the heat-insulating cylinder with a temperature sensor; the temperature measurement ports are arranged one at every 60 degrees by taking the center of a coal sample or a rock sample as a reference, and six ports are used as a group; arranging one group at every 50mm by taking a plane which is 50mm away from the end surface as a reference along the axial direction of the coal sample or the rock sample; the temperature sensor is an ultrasonic temperature sensor;
s42: injecting a certain amount of reactive polymer material slurry into a central hole of the coal sample or the rock sample, and covering the upper end surface of the coal sample or the rock sample by using a hardboard to prevent the polymer material slurry injected into the central hole from overflowing due to expansion;
s5: recording the readings of the temperature sensors on the temperature measurement ports until the reading change of the temperature sensors within 120min is less than 0.5 ℃;
s6: after the temperature test is finished, taking out the coal sample or the rock sample, removing the polymer material and the spring which are reacted and cured in the central hole of the coal sample or the rock sample, uniformly coating the epoxy resin on the lower end surface of the coal sample or the rock sample, then bonding the sealing rubber mat and the epoxy resin layer, and placing the sealing rubber mat on the bottom plate of the permeable cylinder body; connecting and fastening the bottom plate of the infiltration cylinder body and the annular sealing barrel by using bolts;
s61: after the temperature test is finished, coring the coal sample or the rock sample by using a coring device at the central position of the coal sample or the rock sample along the axial direction, removing the polymer material which is reacted and solidified in the central hole of the coal sample or the rock sample, and forming a drill hole with the diameter of 40mm at the center of the polymer material; uniformly coating epoxy resin on the lower end face of the coal sample or the rock sample, and bonding the sealing rubber mat with the epoxy resin layer; the epoxy resin is used for sealing the lower end face of the coal sample or the rock sample, so that the test result is prevented from being influenced by the outflow of test gas from the lower end face in the process of measuring the permeability coefficient of the coal sample or the rock sample; the sealing rubber pad is made of rubber and is in a step disc shape, the small diameter of the sealing rubber pad is equal to the diameter of the circular groove on the bottom plate of the infiltration cylinder body, and the large diameter of the sealing rubber pad is larger than the small diameter; a cylinder with the height larger than the sum of the thickness of the sealing rubber mat and the height of the coal sample or the rock sample is arranged in the center of the bottom plate of the permeation cylinder body, and dense openings are formed in the cylinder to ensure that gas enters the coal sample or the rock sample from the openings of the cylinder;
s62: the two ends of the infiltration cylinder body bottom plate and the two ends of the annular sealing barrel are respectively provided with a corresponding flange, bolt holes are formed in the flanges, the infiltration cylinder body bottom plate and the annular sealing barrel are fastened through bolts, and the outer edge of the sealing rubber pad is extruded to seal the bottom end face of the coal sample or the rock sample; the inner layer of the annular sealing barrel is provided with a sieve pore, the inner diameter of the annular sealing barrel is larger than the outer diameter of the coal sample or the rock sample, so that the test gas flows out of the annular surface of the annular sealing barrel through the central hole of the coal sample or the rock sample, passes through the sieve pore and flows out of a gas outlet arranged on the outer wall of the annular sealing barrel, the gas outlet is connected with a gas outlet pipeline, and the gas outlet pipeline is provided with a gas outlet end valve;
s7: uniformly coating epoxy resin on the upper end surface of a coal sample or a rock sample, then bonding a sealing rubber mat with an epoxy resin layer, and placing a top plate of a permeable cylinder body on the epoxy resin layer, wherein the upper part of the top plate of the permeable cylinder body is provided with an air inlet for providing a channel for the flow of test gas; connecting and fastening the top plate of the infiltration cylinder body and the annular sealing barrel by bolts;
s8: opening a valve at the air inlet end, communicating the air inlet with a high-pressure helium gas source, and adjusting the pressure of helium gas to be a preset value; then opening a valve at the gas outlet end, enabling the high-pressure helium to flow to the gas outlet end through the annular entity of the coal sample or the rock sample under the action of the pressure difference between the gas inlet end and the gas outlet end, reading the numerical value of a flow meter at the gas outlet end, recording the gas flow of the helium at the moment after the numerical value is stable, and further obtaining the corresponding numerical value of the permeability coefficient;
s9: after the permeability coefficient of the coal sample or the rock sample is tested, the bolts and the annular sealing barrel of the top plate and the bottom plate of the permeation cylinder body are dismounted, and a blade is used for scraping the sealing rubber gasket; and then placing the coal sample or the rock sample on a steel bottom plate, arranging the steel bottom plate with the coal sample or the rock sample under the pressurizing device, then opening the pressurizing device, and repeating S3 to finish the test.
2. The method for continuously measuring the characteristics of the mine reactive polymer material after grouting and the coal-rock mixture according to claim 1, is characterized in that: step S1 specifically includes the following steps:
s11: cutting a coal sample or a rock sample collected underground in a coal mine into a cylinder with the diameter of 200mm and the height of 400mm, polishing the end face and the annular surface of the coal sample or the rock sample by using abrasive paper, measuring the distances in four orthogonal directions of the center of the end face by using a vernier caliper by taking the center of the end face of the coal sample or the rock sample as a reference, and if the deviation of any two tests is less than 0.5mm, the size of the coal sample or the rock sample meets the test requirements;
s12: and (3) coring the prepared cylindrical coal sample or rock sample with the diameter of 200mm and the height of 400mm by using a coring device along the axial direction at the central position of the coal sample or rock sample, so that a drill hole with the diameter of 40mm is formed at the center of the cylindrical coal sample or rock sample, and the coring depth is equal to the height of the coal sample or rock sample.
3. The method for continuously measuring the characteristics of the mine reactive polymer material after grouting and the coal-rock mixture according to claim 1, is characterized in that: step S2 specifically includes the following steps:
s21: the steel bottom plate is provided with a circular groove with the diameter slightly larger than the outer diameter of the coal sample or the rock sample for positioning the coal sample or the rock sample; the heat-insulating cylinder is made of polystyrene foam and has the function of isolating the temperature of the coal sample or the rock sample from the outside after the reactive polymer material is injected; the steel top cover plate is annular, the inner diameter of the steel top cover plate is slightly smaller than the inner diameter of the coal sample or the rock sample, and the outer diameter of the steel top cover plate is slightly larger than the outer diameter of the coal sample or the rock sample;
s22: the spring is placed in a central hole of the coal sample or the rock sample, the outer diameter of the spring is equal to the inner diameter of the steel top cover plate, the height of the spring is flush with the upper surface of the steel top cover plate, the compression deformation to a certain degree is generated in the process of pressurizing the coal sample or the rock sample by the pressurizing device, the spring is also subjected to compression deformation along with the compression deformation, and the compression deformation enables the gap between the ring and the ring of the spring to be reduced, so that coal scraps or rock scraps on the inner surface of the coal sample or the rock sample are prevented from falling off.
4. The method for continuously measuring the characteristics of the mine reactive polymer material after grouting and the coal-rock mixture according to claim 1, is characterized in that: step S5 specifically includes the following steps:
s51: starting the temperature sensors immediately after the high polymer material slurry is injected, and recording the readings and the corresponding moments of each temperature sensor at intervals of 10 s;
s52: stopping recording the readings of the temperature sensor until the reading change of the temperature sensor is less than 0.5 ℃ within 120 min; and observing whether the temperature of each test point in the coal sample or the rock sample exceeds 140 ℃, wherein if the temperature exceeds the temperature, the reactive polymer material does not meet the requirements of engineering application.
5. The method for continuously measuring the characteristics of the mine reactive polymer material after grouting and the coal-rock mixture according to claim 1, is characterized in that: step S8 specifically includes the following steps:
s81: the valve at the air inlet end is arranged on an air inlet pipeline, and the air inlet pipeline is connected with an air inlet on a top plate of the infiltration cylinder body; opening a valve at the air inlet end and connecting a high-pressure helium gas source; the high-pressure helium gas source has no physical and chemical reaction with the coal body or the rock mass, so that the gas is applied to test the permeability coefficient of the coal body or the rock mass and reflect the flow resistance property of the gas source to the medium;
s82: the high-pressure helium gas source is connected with the gas inlet pipeline through a pressure reducing valve and is used for controlling the pressure value of the helium gas at the gas inlet end of the coal sample or rock sample;
s83: adjusting the pressure reducing valve to enable the pressure value of helium gas at the gas inlet end to meet the test requirement, then opening a valve at the gas outlet end, and recording the value of a flowmeter at the gas outlet end; the gas outlet end flowmeter is a mass flowmeter;
s84: when the flow meter reading of the gas outlet end is within 1h continuously and the relative deviation is less than 1%, indicating that the flow of the helium gas reaches a stable state, immediately recording the gas flow of the helium gas at the moment, and further acquiring a corresponding permeability coefficient value; the permeability coefficient of the coal sample or the rock sample is calculated according to the following formula:
in the formula: q is the flow rate of helium per unit area, m3/(m2.d)；R1Is the inner diameter, m, of the coal or rock sample; r0Is the outer diameter, m, of the coal sample or rock sample; p is a radical of0The pressure of helium gas at the gas inlet end of the coal sample or rock sample is MPa; p is a radical of1The helium gas pressure at the gas outlet end of the coal sample or rock sample is MPa; lambda is the permeability coefficient of the coal or rock sample, m2/(MPa2.d)。
6. The method for continuously measuring the characteristics of the mine reactive polymer material after grouting and the coal-rock mixture according to claim 1, is characterized in that: step S9 specifically includes the following steps:
s91: after the permeability coefficient of the coal sample or the rock sample is tested, the bolts and the annular sealing barrel of the top plate and the bottom plate of the permeation cylinder body are dismounted, and a blade is used for scraping the sealing rubber gasket;
s92: placing the coal sample or the rock sample on a steel bottom plate, arranging the steel bottom plate with the coal sample or the rock sample under a pressurizing device, then starting the pressurizing device, repeating S3 until the stress-strain curve of the coal sample or the rock sample reaches the peak value, then stopping pressurizing, and recording the axial stress at the moment;
s93: judging the effect of the polymer material on reinforcement by comparing the axial stress when the stress-strain curve of the coal sample or the rock sample before and after the injection of the reactive polymer material reaches the peak value; if the axial stress when the stress-strain curve of the coal sample or the rock sample after the reaction type high polymer material is injected reaches the peak value is larger than that before the injection, the high polymer material has obvious effective effect on reinforcement, otherwise, the stress-strain curve is not.
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| CN113358480B (en) * | 2021-05-13 | 2022-08-05 | 太原理工大学 | Coal rock mechanical test device and test method |
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