CN111622807B - Mine in-situ filling physical evaluation system and method - Google Patents
Mine in-situ filling physical evaluation system and method Download PDFInfo
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- CN111622807B CN111622807B CN202010740787.0A CN202010740787A CN111622807B CN 111622807 B CN111622807 B CN 111622807B CN 202010740787 A CN202010740787 A CN 202010740787A CN 111622807 B CN111622807 B CN 111622807B
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011548 physical evaluation Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 80
- 238000007405 data analysis Methods 0.000 claims abstract description 25
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 238000011156 evaluation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000011148 porous material Substances 0.000 claims description 25
- 239000011159 matrix material Substances 0.000 claims description 13
- 238000012512 characterization method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims 5
- 238000012856 packing Methods 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 4
- 238000010223 real-time analysis Methods 0.000 abstract description 3
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- 238000005259 measurement Methods 0.000 description 5
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a mine in-situ filling physical evaluation system and a method, which relate to the technical field of in-situ filling physical evaluation, and the mine in-situ filling physical evaluation system provided by the invention comprises an in-situ mechanical test device, a data acquisition instrument and a cloud data analysis unit which are sequentially connected; the in-situ mechanical testing device is used for acquiring a plurality of mechanical parameters of the in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument; the data acquisition instrument is used for receiving a plurality of mechanical parameters and establishing a mechanical information database; the cloud data analysis unit is used for analyzing and evaluating parameters in the mechanical information database in real time and giving an early warning. The mine in-situ filling body mechanical evaluation system provided by the invention is suitable for real-time analysis and accurate evaluation of the mechanical properties of the in-situ filling body in the whole time sequence (filling stage, maintenance stage and bearing stage), has strong universality, is integrated with multi-parameter acquisition and processing, and can provide theoretical and technical support for the safety production of filling mining.
Description
Technical Field
The invention relates to the technical field of in-situ filling physical evaluation, in particular to a mine in-situ filling physical evaluation system and method.
Background
The filling mining method has the advantages that other mining methods cannot replace the filling mining method in the aspects of improving the mine recovery rate, reducing the depletion rate, controlling the ground pressure, reducing the emission of industrial solid waste and the like. At present, the traditional filling design method is still adopted for mines at home and abroad, namely filling proportion tests are carried out in the surface laboratory environment, and the strength of test blocks in the 28d curing age is tested. Because the underground stope filling slurry is different from a ground laboratory in the flowing deposition, consolidation and maintenance processes, the in-situ filling slurry has non-uniform characteristics, the in-situ strength distribution is discrete and has larger difference from the design strength, so that technicians have certain blindness in the aspects of underground filling retaining wall arrangement, filling body strength design and quality control, and great hidden danger is brought to the safe production of filling mines.
In addition, in the prior art, an in-situ filling body stress testing instrument is usually a soil pressure box, is easy to embed, is suitable for long-term measurement of the compressive stress of soil bodies in structures such as earth-rock dams, earth embankments, slopes and roadbeds, is matched with a portable manual reading instrument, can directly display stress values, and is simple and visual to measure. However, the soil pressure box can only test the unidirectional stress of the soil body, the mechanical property of the in-situ filling body cannot be tested, and because the filling slurry is a mixture of tailings, cement and water, the soil pressure box is different from the conventional contact medium soil body, the pressed surface of the soil pressure box cannot be completely contacted with the filling body, the precision of test data is low, and the continuous collection of the test data cannot be realized.
Disclosure of Invention
The invention aims to provide a mine in-situ filling physical evaluation system and method, which are suitable for real-time analysis and accurate evaluation of the mechanical properties of an in-situ filling body in the whole time sequence (filling stage, maintenance stage and bearing stage) process, have strong universality and integrated multi-parameter acquisition and processing, and can provide theoretical and technical support for the safety production aspect of filling mining.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, the invention provides a mine in-situ filling physical evaluation system, which comprises an in-situ mechanical testing device, a data acquisition instrument and a cloud data analysis unit which are sequentially connected;
the in-situ mechanical testing device is used for acquiring a plurality of mechanical parameters of the in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument;
the data acquisition instrument is used for receiving a plurality of mechanical parameters and establishing a mechanical information database;
the cloud data analysis unit is used for analyzing and evaluating parameters in the mechanical information database in real time and giving an early warning.
Further, the in situ mechanical testing device includes a frame and a plurality of sensors mounted on the frame.
Further, the plurality of sensors includes at least two of a vibrating wire stress sensor, a pore water pressure sensor, a matrix suction sensor, a temperature-humidity-conductance integrated sensor, and an inclination measuring instrument.
Further, the vibrating wire stress sensor comprises a pressure-bearing round shell, a stress sensing module and a temperature compensation module positioned in the stress sensing module, wherein the stress sensing module is connected with the pressure-bearing round shell.
Further, the outer surface of the frame is in a cube structure.
Further, the vibrating wire stress sensors are configured into three, the three vibrating wire stress sensors are respectively installed on different surfaces of the frame, and the surfaces on which the three vibrating wire stress sensors are installed are orthogonal;
the pore water pressure sensor is arranged on the side surface of the frame, and the pore water pressure sensor is vertically arranged;
the inclination measuring instrument is arranged at the bottom of the frame;
the substrate suction sensor and the temperature-humidity-conductivity integrated sensor are both arranged at the side of the inclination measuring instrument.
Further, the in-situ mechanical testing device is configured to be a plurality of, and a plurality of in-situ mechanical testing devices are connected with one end of a multi-core cable through connecting terminals, and the other end of the multi-core cable is connected with the data acquisition instrument.
The invention also provides a mine in-situ filling physical evaluation method adopting the mine in-situ filling physical evaluation system, which comprises the following steps:
the in-situ mechanical testing device is arranged at a preset position of a goaf to be filled in advance;
in the whole time sequence process of the underground in-situ filling body, the in-situ mechanical testing device acquires a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument;
the data acquisition instrument establishes a mechanical information database;
the cloud data analysis unit analyzes and evaluates various mechanical parameters in the mechanical information database in real time, monitors the mechanical state of the in-situ filling body according to a preset stress early warning value, and automatically alarms once the mechanical parameters monitored in real time reach early warning conditions.
Further, the full time sequence comprises a filling stage, a maintenance stage and a bearing stage;
in the filling stage and the maintenance stage, the cloud data analysis unit establishes a cooperative characterization method of four indexes of matrix suction, temperature, water content and conductivity, and evaluates the internal mechanical properties of the in-situ filling body;
in the bearing stage, the cloud data analysis unit establishes a collaborative characterization method of two indexes of three-dimensional stress and pore water pressure, and evaluates the internal mechanical properties of the in-situ filling body.
Further, the preset stress early warning value includes:
pouring filling slurry into a cube test mould, removing the mould, putting into a standard curing box for curing under the conditions of actual temperature and humidity of a pit stope, and carrying out mechanical strength test after the test piece is cured to obtain a uniaxial compressive strength value of a full stress-strain curve of the filling body, namely a stress early warning value of the in-situ filling body.
The mine in-situ filling physical evaluation system and method provided by the invention can have the following beneficial effects:
when the mine in-situ filling body mechanical evaluation system is used, the in-situ mechanical testing device monitors multiple mechanical parameters of the in-situ filling body and transmits the multiple mechanical parameters to the data acquisition instrument, the data acquisition instrument establishes a mechanical information database after receiving the multiple mechanical parameters, the cloud data analysis unit analyzes data in the mechanical information database in real time so as to monitor the evolution process of mechanical properties in the in-situ filling body, and when a certain parameter or a certain part of parameter exceeds a limit, the cloud data analysis unit alarms.
Compared with the prior art, the mine in-situ filling physical evaluation system provided by the first aspect of the invention is suitable for real-time analysis and accurate evaluation of the mechanical properties of the in-situ filling body in the whole time sequence (filling stage, maintenance stage and bearing stage), has strong universality, is integrated with multi-parameter acquisition and processing, and can provide theoretical and technical support for the safety production aspect of filling mining.
Compared with the prior art, the mine in-situ filling physical evaluation method provided by the second aspect of the invention can realize in-situ filling body in-situ mechanical property multi-parameter test, and the cloud data analysis unit can monitor the in-situ filling body mechanical state in real time and automatically alarm when the monitored parameters are out of range, so that engineering personnel can accurately manage and control the in-situ filling body.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a mine in-situ filling physical evaluation system provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a vibrating wire stress sensor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a tilt meter according to an embodiment of the present invention;
FIG. 4 is a schematic three-dimensional structure of an in-situ mechanical testing device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an installation structure of a mine in-situ filling physical evaluation system provided by an embodiment of the invention;
FIG. 6 is a block diagram of a method for mechanically evaluating in-situ filling forces of a mine provided by an embodiment of the invention;
FIG. 7 is a schematic illustration of an in-situ mechanical testing arrangement of a test stope provided by an embodiment of the present invention;
FIG. 8 is a graph of pore water pressure test data for a first point location provided in an embodiment of the present invention;
fig. 9 is a three-dimensional stress test data diagram of a first point according to an embodiment of the present invention.
Icon: 1-an in-situ mechanical testing device; 11-a frame; 12-vibrating wire stress sensor; 121-a pressure-bearing round shell; 122-a stress sensing module; 13-pore water pressure sensor; 14-matrix suction sensors; 15-temperature-humidity-conductance integrated sensor; 16-an inclinometer; 161-tilt sensor; 2-a data acquisition instrument; 3-cloud data analysis unit; 4-a mechanical information database; 5-ore pillar; 6-filling body; 7-filling the retaining wall; 8-a first point location; 9-a second point location; 10-a third point location; 101-fourth point.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
An embodiment of the first aspect of the present invention provides a mine in-situ filling physical evaluation system, as shown in fig. 1, including an in-situ mechanical testing device 1, a data acquisition instrument 2 and a cloud data analysis unit 3, which are sequentially connected; the in-situ mechanical testing device 1 is used for acquiring a plurality of mechanical parameters of the in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument 2; the data acquisition instrument 2 is used for receiving a plurality of mechanical parameters and establishing a mechanical information database 4; the cloud data analysis unit 3 is used for analyzing and evaluating parameters in the mechanical information database 4 in real time and giving early warning.
The in-situ mechanical testing device 1 can monitor multiple mechanical parameters of the in-situ filling body at the same time and transmit the multiple mechanical parameters to the data acquisition instrument 2, so that the mechanical property monitoring of the in-situ filling body is realized, the data acquisition instrument 2 establishes the mechanical information database 4 after receiving the multiple mechanical parameters, so that the cloud data analysis unit can analyze and evaluate data in the mechanical information database in real time, and when a certain parameter or a certain part of parameters exceed a limit, the cloud data analysis unit can alarm, thereby providing theoretical and technical support for the safety production aspect of filling mining.
In some embodiments, in situ mechanical testing device 1 includes a frame 11 and a variety of sensors mounted on frame 11.
The frame 11 provides a larger installation space for each sensor, and a plurality of sensors can be installed at different positions of the frame 11 so as to monitor the mechanical properties of the in-situ filling body more comprehensively. In addition, according to different monitoring functions of different sensors, the sensors can be transversely, longitudinally and vertically arranged on the frame 11, and the monitoring result is more accurate.
Among the various sensors are at least two of vibrating wire stress sensor 12, pore water pressure sensor 13, matrix suction sensor 14, temperature-humidity-conductance integrated sensor 15, and inclinometer 16.
Of course, the type of sensor is not limited to the above.
The function of each sensor is explained in detail below:
the vibrating wire stress sensor 12 can realize interface stress transmission with the filling body, monitor the stress change in the in-situ filling body, and the measuring range of the vibrating wire stress sensor 12 is 0-4MPa; the pore water pressure sensor 13 can test the pore water pressure of the in-situ filling body, and the measurement range of the pore water pressure sensor 13 is 0-4MPa; the matrix suction sensor 14 can test the matrix suction of the in-situ filling body, and the measurement range of the matrix suction sensor 14 is 0-2.5MPa; the temperature-humidity-conductivity integrated sensor 15 can test three parameters of the temperature, the humidity and the conductivity of the in-situ filling body at the same time, the temperature measurement range of the temperature-humidity-conductivity integrated sensor 15 is-25 ℃ to +65 ℃, the water content measurement range is 0-100%, and the conductivity measurement range is 0-2.3S/m; the inclinometer 16 is capable of testing the inclination angle of an in situ mechanical testing device, with the inclinometer 16 measuring in the range of-15 deg. +15 deg.. The sensor can fully monitor the change condition of the mechanical property inside the in-situ filling body and collect the mechanical property parameters of the in-situ filling body.
Specifically, as shown in fig. 2, the vibrating wire stress sensor 12 includes a pressure-bearing circular shell 121, a stress sensing module 122, and a temperature compensation module located in the stress sensing module 122, wherein the stress sensing module 122 is connected with the pressure-bearing circular shell 121. The pressure-bearing round shell 121 is of a stressed structure, deformation of the pressure-bearing round shell 121 is transmitted to the stress sensing module 122 in the form of an electric signal, and the stress sensing module 122 transmits stress parameters corresponding to the deformation of the pressure-bearing round shell 121 to the data acquisition instrument 2 in the form of the electric signal. In addition, a temperature compensation module is arranged in the stress sensing module 122, and can improve the accuracy of stress test data and ensure the accuracy of the obtained stress parameters.
As shown in fig. 3, the inclination measuring instrument 16 includes an inclination sensor 161, and the inclination sensor 161 is connected to the data acquisition instrument 2 by a cable.
In at least one embodiment, as shown in FIG. 4, the outer surface of the frame 11 is of a cubic configuration. The sensors may be on the respective surfaces of the frame 11 without affecting each other when the respective sensors are mounted.
Specifically, the frame 11 is a metal frame, and the side length thereof is 30cm to 60cm.
Of course, the outer surface of the frame 11 may have a rectangular parallelepiped structure or other shape.
In at least one embodiment, the vibrating wire stress sensors 12 are configured in three, the three vibrating wire stress sensors 12 are respectively mounted on different surfaces of the frame 11, and the surfaces on which the three vibrating wire stress sensors 12 are mounted are orthogonal; the pore water pressure sensor 13 is installed at the side of the frame 11, and the pore water pressure sensor 13 is installed vertically; the inclination measuring instrument 16 is mounted at the bottom of the frame 11; both the substrate suction sensor 14 and the temperature-humidity-conductivity integrated sensor 15 are mounted laterally of the inclinometer 16.
The three vibrating wire stress sensors 12 are used for respectively monitoring stress parameters in three directions of the in-situ filling body, namely, the transverse direction, the vertical direction and the longitudinal direction, and are assembled into a three-dimensional stress sensor for comprehensively monitoring the stress condition of the surface of the in-situ filling body; the pore water pressure sensor 13 can be specifically arranged on an upright post on the side surface of the frame 11 to obtain pore water pressure of the in-situ filling body; the inclination measuring instrument 16 is arranged at the bottom of the frame 11, so that the position of the inclination measuring instrument 16 relative to the frame 11 can be stable; the matrix suction sensor 14 and the temperature-humidity-conductivity integrated sensor 15 are both arranged at the side of the inclination measuring instrument 16, so that normal monitoring of the performance parameters of the in-situ filling body can be ensured, and meanwhile, the frame 11 protects the matrix suction sensor and the temperature-humidity-conductivity integrated sensor.
Taking fig. 4 as an example for specific illustration, the frame 11 includes a top surface, a bottom surface and four side surfaces, three vibrating wire stress sensors 12 are respectively distributed on the top surface and two adjacent side surfaces of the frame 11, the pore water pressure sensor 13 is distributed on one of the remaining two side surfaces of the frame 11, and the inclination measuring instrument 16, the matrix suction sensor 14 and the temperature-humidity-conductivity integrated sensor 15 are located in the frame 11 and are mounted on the bottom surface of the frame 11.
In some embodiments, as shown in fig. 5, the in-situ mechanical testing device 1 is configured in a plurality, the ore pillars 5 are arranged on two sides of the filling body 6, and the in-situ mechanical testing devices 1 are connected with one end of a multi-core cable through a connecting terminal, and the other end of the multi-core cable is connected with the data acquisition instrument 2.
It should be noted that the length of the multi-core cable should meet the design requirement, and marks are made near the end of the multi-core cable, so that the multi-core cable is easy to identify.
An embodiment of the second aspect of the present invention is to provide a method for mechanically evaluating in-situ filling forces of a mine, where the method for mechanically evaluating in-situ filling forces of a mine provided by the embodiment of the second aspect of the present invention uses the system for mechanically evaluating in-situ filling forces of a mine, including:
the in-situ mechanical testing device 1 is placed at a preset position of a goaf to be filled in advance;
in the whole time sequence process of the underground in-situ filling body, the in-situ mechanical testing device 1 acquires a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument 2;
the data acquisition instrument 2 establishes a mechanical information database 4;
the cloud data analysis unit 3 analyzes and evaluates various mechanical parameters in the mechanical information database 4 in real time, monitors the mechanical state of the in-situ filling body according to a preset stress early warning value, and automatically alarms once the mechanical parameters monitored in real time reach early warning conditions.
Compared with the prior art, the mine in-situ filling body mechanical evaluation method provided by the embodiment of the second aspect of the invention can realize in-situ filling body mechanical property multi-parameter test, and the cloud data analysis unit 3 can monitor the in-situ filling body mechanical state in real time and automatically alarm when the monitored parameters are out of range, so that engineering personnel can accurately manage and control the in-situ filling body mechanical property.
Before the underground goaf begins to be installed, it is necessary to check whether the performance of the in-situ mechanical testing device 1 and the data acquisition instrument 2 are working properly.
Specifically, the in-situ mechanical testing device 1 can be adjusted to a preset position through a fixed pulley fixed on the goaf roof, the data acquisition instrument 2 is arranged on the outer side of the filling retaining wall 7, and a storage battery power supply or 220V alternating current power supply is selected according to the field working condition.
In addition, the cables of the in-situ mechanical testing device 1 should be left with allowance when being laid, and the cables are forbidden to be mutually intertwined when being gathered together, and the cables are led out of the outer side of the filling retaining wall 7 and then connected with the data acquisition instrument 2, so that the redundant cables are wound and hung on the reinforcing steel bars near the data acquisition instrument 2, and the reinforcing steel bars are prevented from being damaged by rolling equipment.
Specifically, as shown in fig. 6, the full-time sequence includes a filling phase, a maintenance phase, and a carrying phase;
in the filling stage and the maintenance stage, the cloud data analysis unit 3 establishes a cooperative characterization method of four indexes of matrix suction, temperature, water content and conductivity, and evaluates the internal mechanical properties of the in-situ filling body;
in the bearing stage, the cloud data analysis unit 3 establishes a collaborative characterization method of two indexes of three-dimensional stress and pore water pressure, and evaluates the internal mechanical properties of the in-situ filling body.
Specifically, monitoring of four indexes of the suction force, the temperature, the water content and the conductivity of the substrate is realized through the substrate suction sensor 14 and the temperature-humidity-conductivity integrated sensor 15; the three vibrating wire stress sensors 12 and the pore water pressure sensors 13 are used for monitoring two indexes of three-dimensional stress and pore water pressure.
The collaborative characterization method specifically can include constructing a stress line graph under a rectangular coordinate system.
In some embodiments, the pre-stress pre-warning value comprises: pouring filling slurry into a cube test mould, removing the mould, putting into a standard curing box for curing under the conditions of actual temperature and humidity of a pit stope, and carrying out mechanical strength test after the test piece is cured to obtain a uniaxial compressive strength value of a full stress-strain curve of the filling body, namely a stress early warning value of the in-situ filling body.
The side length of the cube test mold is 7.07cm, and the cube test mold can float at about 7.07 cm.
In addition, after the die is disassembled, the die is placed into a standard curing box for curing for 28 days, and after curing is finished, an electrohydraulic servo press is used for mechanical strength test.
The following is a detailed description of specific embodiments:
some subway mine production scale is 750 ten thousand t/a. At present, the land adopts a two-step segmented open stoping subsequent filling mining method, the stage height is 100m, the segmented height is 25m, the length is the horizontal thickness of a ore body, the average thickness is 50m, no gap pillar is reserved between stopes, and the volume of a single stope empty area reaches 10-16 ten thousand m3. Because the mine is stoped safely in the earlier stage, the filling proportion parameters of the whole stope are higher, the filling cost is increased, and meanwhile, in the actual production process, the in-situ filling body has the phenomena of ledge and collapse locally, so that the mine is urgently required to test the internal stress distribution state of the in-situ filling body, and the stope filling proportion parameters are accurately designed.
1) According to the distribution form of the underground mine test stope, arranging an in-situ mechanical test point position at the level of 4 sections of the test stope;
2) Aiming at the mechanical property test requirement of the underground in-situ filling body, the in-situ mechanical testing device 1 consists of a cube metal frame, a vibrating wire stress sensor 12, a pore water pressure sensor 13, an inclination measuring instrument 16 and other modules;
3) As shown in fig. 7, the data acquisition instrument 2 can simultaneously read test data signals of 10 channels, namely, test data of two test points are satisfied, so that cables of the in-situ mechanical testing device 1 of the first point location 8 and the second point location 9 all run out from a filling retaining wall of the second point location 9, and cables of testing devices of the third point location 10 and the fourth point location 101 all run out from a filling retaining wall of the fourth point location 101.
4) Because the optical fibers are not paved in the underground mine test stope, after the in-situ mechanical testing device 1 is installed, the two data acquisition instruments 2 are required to be subjected to data acquisition regularly, and the acquired data are timely transmitted to the notebook computer through the USB interface.
5) The concentration of filling slurry in a test stope is 70%, the sand-lime ratio is 1:10, and the strength of the cementing filling body in the 28d curing age is 3.33MPa. Therefore, in the cloud data analysis unit 3, the stress early warning value of the 4 test points is 3.33MPa, and meanwhile, the acquired data are processed, as shown in fig. 8 and 9, so that the pore water pressure and the three-dimensional stress change inside the 4 test points are obtained.
6) The test data of the in-situ mechanical device of the first point location 8 are shown in fig. 8 to 9, in the full-time test process, the peak value of pore water pressure is 0.15MPa, the vertical stress in the three-dimensional stress is higher than the horizontal stress, and the vertical stress is 1.82MPa, so that the required strength of the underground in-situ filling body is accurately determined, and further, the adjustment of filling proportion parameters of a stope can be scientifically guided.
In summary, the system and the method for evaluating the mechanical properties of the mine in-situ filling body provided by the invention have the following advantages:
1. the in-situ mechanical evaluation system can evaluate the evolution process of the mechanical property of the in-situ filler in real time in the whole time sequence (filling stage, maintenance stage and bearing stage), integrates data acquisition and processing, has a stress early warning function, and is convenient for engineering personnel to accurately manage and control.
2. The in-situ mechanical testing device 1 is assembled in a modularized way, is rapid to install and high in universality, and can realize multi-parameter testing of in-situ mechanical properties of the in-situ filler.
3. Aiming at the characteristics of underground filling materials and environment, the vibrating wire stress sensor 12 is adopted, so that the interface stress transmission with a filling body can be realized, a temperature compensation module is added, and the accuracy of stress test data is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. The mine in-situ filling physical evaluation method is characterized by adopting a mine in-situ filling physical evaluation system, wherein the mine in-situ filling physical evaluation system comprises an in-situ mechanical test device (1), a data acquisition instrument (2) and a cloud data analysis unit (3) which are connected in sequence;
the in-situ mechanical testing device (1) is used for acquiring a plurality of mechanical parameters of the in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument (2);
the data acquisition instrument (2) is used for receiving a plurality of mechanical parameters and establishing a mechanical information database (4);
the cloud data analysis unit (3) is used for analyzing and evaluating parameters in the mechanical information database (4) in real time and giving an early warning;
the in-situ mechanical testing device (1) comprises a frame (11) and a plurality of sensors arranged on the frame (11);
a plurality of the sensors comprise a vibrating wire stress sensor (12), a pore water pressure sensor (13), a matrix suction sensor (14), a temperature-humidity-conductivity integrated sensor (15) and an inclination measuring instrument (16);
the vibrating wire stress sensor (12) comprises a deformable pressure-bearing round shell (121), a stress induction module (122) and a temperature compensation module positioned in the stress induction module (122), wherein the stress induction module (122) is connected with the deformable pressure-bearing round shell (121);
the pressure-bearing round shell (121) is of a stress structure, deformation of the pressure-bearing round shell (121) is transmitted to the stress induction module (122) in the form of an electric signal, and the stress induction module (122) transmits stress parameters corresponding to the deformation of the pressure-bearing round shell (121) to the data acquisition instrument (2) in the form of an electric signal;
the outer surface of the frame (11) is of a cube structure, and the side length is 30cm-60cm;
the vibrating wire stress sensors (12) are configured into three, the three vibrating wire stress sensors (12) are respectively arranged on different surfaces of the frame (11), and the surfaces on which the three vibrating wire stress sensors (12) are arranged are orthogonal;
the mechanical evaluation method for the mine in-situ filling body comprises the following steps:
the in-situ mechanical testing device (1) is arranged at a preset position of the goaf to be filled in advance through a fixed pulley fixed on the top plate of the goaf;
in the whole time sequence process of the underground in-situ filling body, the in-situ mechanical testing device (1) acquires a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument (2);
the data acquisition instrument (2) establishes a mechanical information database (4);
the cloud data analysis unit (3) analyzes and evaluates various mechanical parameters in the mechanical information database (4) in real time, monitors the mechanical state of the in-situ filling body according to a preset stress early warning value, and automatically alarms once the mechanical parameters monitored in real time reach early warning conditions;
the full time sequence comprises a filling stage, a maintenance stage and a bearing stage;
in the filling stage and the maintenance stage, the cloud data analysis unit (3) establishes a cooperative characterization method of four indexes of matrix suction, temperature, water content and conductivity, and evaluates the internal mechanical properties of the in-situ filling body;
in the bearing stage, the cloud data analysis unit (3) establishes a collaborative characterization method of two indexes of three-dimensional stress and pore water pressure, and evaluates the internal mechanical properties of the in-situ filling body;
the collaborative characterization method comprises the steps of constructing a stress line graph under a rectangular coordinate system;
the preset stress early warning value comprises the following steps:
pouring filling slurry into a cube test mould, removing the mould, putting into a standard curing box for curing under the conditions of actual temperature and humidity of a pit stope, and carrying out mechanical strength test after the test piece is cured to obtain a uniaxial compressive strength value of a full stress-strain curve of the filling body, namely a stress early warning value of the in-situ filling body.
2. The mine in-situ packing mechanics evaluation method as claimed in claim 1, wherein the pore water pressure sensor (13) is installed at a side of the frame (11), and the pore water pressure sensor (13) is installed vertically;
the inclination measuring instrument (16) is mounted at the bottom of the frame (11);
the substrate suction sensor (14) and the temperature-humidity-conductivity integrated sensor (15) are both mounted laterally to the inclinometer (16).
3. The mine in-situ filling physical evaluation method according to claim 1, wherein a plurality of in-situ mechanical test devices (1) are configured, the in-situ mechanical test devices (1) are connected with one end of a multi-core cable through connecting terminals, and the other end of the multi-core cable is connected with the data acquisition instrument (2).
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| CN114459537B (en) * | 2022-01-14 | 2023-03-10 | 中国科学院武汉岩土力学研究所 | Monitoring method for geotechnical structure of landfill |
| CN114491895B (en) * | 2022-04-01 | 2022-08-30 | 广东电网有限责任公司东莞供电局 | Cable laying stress analysis method and device |
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