CN111985101A - Deep well impact dangerous roadway branch unloading coupling scour prevention method - Google Patents
Deep well impact dangerous roadway branch unloading coupling scour prevention method Download PDFInfo
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Abstract
The invention discloses a deep well impact dangerous roadway branch-unloading coupling anti-impact method, belonging to the technical field of mine coal mining prevention and control, and comprising the following steps: s1, adopting a dynamic damage model of the axial force of the anchor rod to preliminarily optimize the parameters of coal mine coal bed blasting on a computer; according to the deep well impact dangerous roadway unloading coupling anti-impact method, selection of a roadway rock burst prevention and control method, optimization design of key parameters and reasonable combination and collocation are utilized, numerical simulation and field actual measurement are combined, a pressure relief blasting design optimization technology taking 'field actual measurement of blasting vibration basic parameters → analysis of blasting vibration mechanism → numerical simulation optimization of multiple groups of blasting schemes → field inspection of danger relieving effect of preferred schemes' as steps is established, and when reasonable anti-impact design is carried out, double effects of pressure relief engineering on 'pressure relief force' and 'damage support' of a roadway are fully considered, so that the method has important significance for mine guarantee safety production.
Description
Technical Field
The invention relates to the technical field of mine coal mining prevention and control, in particular to a deep well impact dangerous roadway branch-unloading coupling anti-impact method.
Background
The coal mine is a region for mining coal resources in a coal-rich mining area by human beings, and is generally divided into a mineworker coal mine and an open pit coal mine, when a coal seam is far away from the ground surface, coal is generally excavated to an underground excavation roadway, the mineworker coal mine is the mineworker coal mine, when the coal seam is very close to the ground surface, the surface soil layer is generally directly peeled to excavate the coal, the open pit coal mine is the open pit coal mine, most coal mines in China belong to the mineworker coal mine, the roadways, the wells, the excavation surfaces and the like are generally included, wherein the thick deep-well coal seam means the coal seam mined by the mineworkers for more than 3.5m and mined for more than 10 m.
The coal mining depth is large, the geological conditions are complex, coal rock has impact tendency, and the problem of severe rock burst disaster is faced during mining.
On the one hand, the strengthening of the pressure relief work can play a positive effect of releasing the elastic energy, but the unreasonable parameter design can cause the surrounding rock of the roadway and the supporting structure thereof to be seriously damaged, so that the supporting surrounding rock fails and the surrounding rock loses the self-bearing capacity; on the other hand, if the pressure relief is insufficient, surrounding rocks at the shallow part of the roadway can accumulate a large amount of compression elastic energy, high-energy vibration is easy to occur under the action of mining disturbance, and even if the supporting strength of the roadway is high, huge damage caused by impact cannot be resisted.
Disclosure of Invention
The invention aims to provide a deep well impact dangerous roadway branch-unloading coupling anti-impact method, which aims to solve the problems that on one hand, the positive effect of releasing elastic energy can be achieved by strengthening pressure-relief work, but the unreasonable parameter design can cause serious damage to roadway surrounding rocks and supporting structures thereof, so that the supporting surrounding rocks are invalid, and the surrounding rocks lose self-bearing capacity; on the other hand, if the pressure relief is insufficient, surrounding rocks at the shallow part of the roadway can accumulate a large amount of compression elastic energy, high-energy vibration is easy to occur under the action of mining disturbance, and even if the roadway support strength is high, the problem of huge damage caused by impact cannot be resisted.
In order to achieve the purpose, the invention provides the following technical scheme: a deep well impact dangerous roadway branch-unloading coupling scour prevention method comprises the following steps:
s1, adopting a dynamic damage model of the axial force of the anchor rod, carrying out preliminary optimization on the parameters of coal mine coal bed blasting on a computer, and respectively carrying out numerical calculation on the explosive quantities of 2kg, 3kg, 4kg, 5kg, 6kg, 7kg and 8kg and the hole depths of 10m, 12m, 15m and 18 m;
s2, comprehensively considering the influence and pressure relief effect of blasting on a supporting structure, selecting coal bed blasting with parameters of 12m and 15m of hole depth and 2 kg-6 kg of explosive amount as a relatively good blasting scheme, and testing the optimization effect of pressure relief blasting design of a roadway through field actual measurement to ensure the practicability of the optimization result on the field;
s3, performing drilling peeping analysis on the coal seam blasting pressure relief effect, and performing drilling peeping by using an intelligent drilling television imager to detect the structure of a rock stratum in a rock stratum drilling hole;
s4, analyzing the peeping result:
(1): drilling a test hole: a common coal side anchor rod drilling machine can be used for drilling a phi 28mm hole, a side hole is drilled at the waist line position, and a top hole is drilled at the center line position of a top plate;
(2): cleaning the coal dust in the drilled hole: flushing the drill hole by water before and after blasting, cleaning up coal dust and drill slag in the drill hole, and opening a water valve of a drilling machine to flush the drill hole for 2min to the maximum after the hole is drilled to a specified position;
(3): the specific test process is as follows: after the drilling is finished, the drill pipe is placed for 30min, after water in the hole is drained, the equipment is started, the probe is pushed to the bottom of the hole at a constant speed of 1m/min by using a steel rod capable of being lengthened, the clarity of the probe is ensured in the whole process, and the probe is prevented from being shielded by water or pulverized coal;
s5, designing 4 testing stations in total, wherein the single-hole dosage is respectively 2kg, 3kg, 4kg and 5kg, each testing station respectively comprises 1 blasting pressure relief hole and 5 peepholes, the hole diameter of each blast hole is 42mm, the hole depth is 15m, the distances from the peepholes to the blast holes are respectively 1m, 2m, 3m, 4m and 5m, the hole diameter is 42mm, and the hole depth is 15 m;
s6, detecting the coal body peep holes before and after blasting, comparing the crack development conditions in the holes before and after blasting, counting the positions of the holes each meter of which contains the length of a crack zone, drawing a corresponding histogram for analysis, and uniformly counting the crack length in the range of 10m before and after blasting because more collapsed holes appear in the deep parts in the holes after blasting and the peeping result of more than 10m is poor;
s7, counting the crack of the survey station with the dosage of 2kg, and displaying the anchoring section 0-3 m away from the lane wall by all the 5 peephole peeping results; the crack statistical condition of the testing station with the dosage of 3kg, the maximum crack width increase value of an anchoring section 0-3 m away from the roadway side is 5.35%, and 10% of the crack width is used as the judgment standard of support damage; the crack statistical condition of the testing station with the dosage of 4kg, the maximum crack width increase value of an anchoring section 0-3 m away from the roadway side is 7.67%, and 10% of the crack width is used as the judgment standard of support damage; the statistical condition of the cracks of the observation station with the dosage of 5kg, the cracks are increased in different degrees outside the anchoring section, the crack growth amplitude is reduced along with the increase of the distance between the peephole and the blast hole, and the crack width increase values of the 5 peepholes in the section of 3-10 m are 523.17%, 274.55%, 101.17%, 51.74% and 14.25% respectively;
and S8, analyzing the coal bed blasting pressure relief effect by a drilling cutting method, respectively analyzing the blasting pressure relief effect of 12m hole depth and 2kg, 4kg and 5kg of explosive quantity, respectively taking drilling cuttings once at positions 1.5m away from two sides of a blasting hole before and after blasting, and then measuring the average value of the drilling cuttings twice to respectively obtain drilling cuttings curves before and after blasting.
Compared with the prior art, the invention has the beneficial effects that: according to the deep well impact dangerous roadway unloading coupling anti-impact method, selection of a roadway rock burst prevention and control method, optimization design of key parameters and reasonable combination and collocation are utilized, numerical simulation and field actual measurement are combined, a pressure relief blasting design optimization technology taking 'field actual measurement of blasting vibration basic parameters → analysis of blasting vibration mechanism → numerical simulation optimization of multiple groups of blasting schemes → field inspection of danger relieving effect of preferred schemes' as steps is established, and when reasonable anti-impact design is carried out, double effects of pressure relief engineering on 'pressure relief force' and 'damage support' of a roadway are fully considered, so that the method has important significance for mine guarantee safety production.
Drawings
FIG. 1 is a graphical representation of the drilling cuttings volume before and after 2KG charge blasting pressure relief in accordance with the present invention;
FIG. 2 is a graphical representation of the drilling cuttings volume before and after 4KG charge blasting pressure relief in accordance with the present invention;
FIG. 3 is a graphical representation of the drilling cuttings volume before and after 5KG charge blasting pressure relief in accordance with the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a deep well impact dangerous roadway branch-unloading coupling scour prevention method comprises the following steps:
s1, adopting a dynamic damage model of the axial force of the anchor rod, carrying out preliminary optimization on the parameters of coal mine coal bed blasting on a computer, and respectively carrying out numerical calculation on the explosive quantities of 2kg, 3kg, 4kg, 5kg, 6kg, 7kg and 8kg and the hole depths of 10m, 12m, 15m and 18 m;
s2, comprehensively considering the influence and pressure relief effect of blasting on a supporting structure, selecting coal bed blasting with parameters of 12m and 15m of hole depth and 2 kg-6 kg of explosive amount as a relatively good blasting scheme, and testing the optimization effect of pressure relief blasting design of a roadway through field actual measurement to ensure the practicability of the optimization result on the field;
s3, performing drilling peeping analysis on the coal seam blasting pressure relief effect, and performing drilling peeping by using an intelligent drilling television imager to detect the structure of a rock stratum in a rock stratum drilling hole;
s4, analyzing the peeping result:
(1): drilling a test hole: a common coal side anchor rod drilling machine can be used for drilling a phi 28mm hole, a side hole is drilled at the waist line position, and a top hole is drilled at the center line position of a top plate;
(2): cleaning the coal dust in the drilled hole: flushing the drill hole by water before and after blasting, cleaning up coal dust and drill slag in the drill hole, and opening a water valve of a drilling machine to flush the drill hole for 2min to the maximum after the hole is drilled to a specified position;
(3): the specific test process is as follows: after the drilling is finished, the drill pipe is placed for 30min, after water in the hole is drained, the equipment is started, the probe is pushed to the bottom of the hole at a constant speed of 1m/min by using a steel rod capable of being lengthened, the clarity of the probe is ensured in the whole process, and the probe is prevented from being shielded by water or pulverized coal;
s5, designing 4 testing stations in total, wherein the single-hole dosage is respectively 2kg, 3kg, 4kg and 5kg, each testing station respectively comprises 1 blasting pressure relief hole and 5 peepholes, the hole diameter of each blast hole is 42mm, the hole depth is 15m, the distances from the peepholes to the blast holes are respectively 1m, 2m, 3m, 4m and 5m, the hole diameter is 42mm, and the hole depth is 15 m;
s6, detecting the coal body peep holes before and after blasting, comparing the crack development conditions in the holes before and after blasting, counting the positions of the holes each meter of which contains the length of a crack zone, drawing a corresponding histogram for analysis, and uniformly counting the crack length in the range of 10m before and after blasting because more collapsed holes appear in the deep parts in the holes after blasting and the peeping result of more than 10m is poor;
s7, counting the crack of the survey station with the dosage of 2kg, and displaying the anchoring section 0-3 m away from the lane wall by all the 5 peephole peeping results; the crack statistical condition of the testing station with the dosage of 3kg, the maximum crack width increase value of an anchoring section 0-3 m away from the roadway side is 5.35%, and 10% of the crack width is used as the judgment standard of support damage; the crack statistical condition of the testing station with the dosage of 4kg, the maximum crack width increase value of an anchoring section 0-3 m away from the roadway side is 7.67%, and 10% of the crack width is used as the judgment standard of support damage; the statistical condition of the cracks of the observation station with the dosage of 5kg, the cracks are increased in different degrees outside the anchoring section, the crack growth amplitude is reduced along with the increase of the distance between the peephole and the blast hole, and the crack width increase values of the 5 peepholes in the section of 3-10 m are 523.17%, 274.55%, 101.17%, 51.74% and 14.25% respectively;
and S8, analyzing the coal bed blasting pressure relief effect by a drilling cutting method, respectively analyzing the blasting pressure relief effect of 12m hole depth and 2kg, 4kg and 5kg of explosive quantity, respectively taking drilling cuttings once at positions 1.5m away from two sides of a blasting hole before and after blasting, and then measuring the average value of the drilling cuttings twice to respectively obtain drilling cuttings curves before and after blasting.
Example 1
A deep well impact dangerous roadway branch-unloading coupling scour prevention method comprises the following steps:
s1, adopting a dynamic damage model of the axial force of the anchor rod, carrying out preliminary optimization on the parameters of coal mine coal bed blasting on a computer, and respectively carrying out numerical calculation on the explosive quantities of 2kg, 3kg, 4kg, 5kg, 6kg, 7kg and 8kg and the hole depths of 10m, 12m, 15m and 18 m;
s2, comprehensively considering the influence and pressure relief effect of blasting on a supporting structure, selecting coal bed blasting with parameters of 12m and 15m of hole depth and 2kg to 6kg of explosive amount as a relatively good blasting scheme, and testing the optimization effect of pressure relief blasting design of a roadway through field actual measurement to ensure the practicability of the optimization result on the field;
s3, performing drilling peeping analysis on the coal seam blasting pressure relief effect, and performing drilling peeping by using an intelligent drilling television imager to detect the structure of a rock stratum in a rock stratum drilling hole;
s4, analyzing the peeping result:
(1): drilling a test hole: a common coal side anchor rod drilling machine can be used for drilling a phi 28mm hole, a side hole is drilled at the waist line position, and a top hole is drilled at the center line position of a top plate;
(2): cleaning the coal dust in the drilled hole: flushing the drill hole by water before and after blasting, cleaning up coal dust and drill slag in the drill hole, and opening a water valve of a drilling machine to flush the drill hole for 2min to the maximum after the hole is drilled to a specified position;
(3): the specific test process is as follows: after the drilling is finished, the drill pipe is placed for 30min, after water in the hole is drained, the equipment is started, the probe is pushed to the bottom of the hole at a constant speed of 1m/min by using a steel rod capable of being lengthened, the clarity of the probe is ensured in the whole process, and the probe is prevented from being shielded by water or pulverized coal;
s5, designing 4 testing stations in total, wherein the single-hole dosage is respectively 2kg, 3kg, 4kg and 5kg, each testing station respectively comprises 1 blasting pressure relief hole and 5 peepholes, the hole diameter of each blast hole is 42mm, the hole depth is 15m, the distances from the peepholes to the blast holes are respectively 1m, 2m, 3m, 4m and 5m, the hole diameter is 42mm, and the hole depth is 15 m;
s6, detecting the coal body peep holes before and after blasting, comparing the crack development conditions in the holes before and after blasting, counting the positions of the holes each meter of which contains the length of a crack zone, drawing a corresponding histogram for analysis, and uniformly counting the crack length in the range of 10m before and after blasting because more collapsed holes appear in the deep parts in the holes after blasting and the peeping result of more than 10m is poor;
s7, counting the crack of the survey station with the dosage of 2kg, and displaying the anchoring section 3m away from the lane wall by all the 5 peephole peeping results; the crack statistical condition of the testing station with the dosage of 3kg, the maximum crack width increase value of an anchoring section 3m away from a roadway side is 5.35%, and 10% of crack width is used as a judgment standard of support damage; the crack statistical condition of the testing station with the dosage of 4kg, the maximum crack width increase value of an anchoring section 3m away from a roadway side is 7.67%, and 10% of crack width is used as a judgment standard of support damage; the statistical condition of the cracks of the observation station with the dosage of 5kg, the cracks grow in different degrees outside the anchoring section, the crack growth amplitude is reduced along with the increase of the distance between the peephole and the blast hole, and the crack width increase values of the 5 peepholes in the 10m section are 523.17%, 274.55%, 101.17%, 51.74% and 14.25% respectively;
and S8, analyzing the coal bed blasting pressure relief effect by a drilling cutting method, respectively analyzing the blasting pressure relief effect of 12m hole depth and 2kg, 4kg and 5kg of explosive quantity, respectively taking drilling cuttings once at positions 1.5m away from two sides of a blasting hole before and after blasting, and then measuring the average value of the drilling cuttings twice to respectively obtain drilling cuttings curves before and after blasting.
Example 2
It is known from the drilling blasting science that after the cartridge in the drill hole is detonated, the detonation wave propagates in all directions at a certain speed, at the moment after detonation, the explosive gas fills the whole drill hole, the overpressure of the explosive gas acts on the hole wall at the same time, the pressure reaches thousands to tens of thousands of MPa, the coal body near the detonation source is compacted under the action of high temperature and high pressure, and as a result of strong pressure action, a pressure stress field is formed around the detonation hole, the coal body around generates compression deformation under the action of the pressure stress, the coal rock body in the pressure stress field generates radial displacement, and is subjected to the action of tensile stress in the tangential direction to generate tensile deformation, and as the tensile capacity of the coal rock is far lower than the compressive capacity, when the tensile stress exceeds a failure strain value, cracks are generated in the radial direction at first. In the radial direction, due to different particle displacements, the resistances thereof are different, so that shear stress is inevitably generated, and if the shear stress exceeds the shear strength of the coal rock, shear failure is generated, and radial shear cracks are generated, thereby providing the following method;
a deep well impact dangerous roadway branch-unloading coupling scour prevention method comprises the following steps:
s1, adopting a dynamic damage model of the axial force of the anchor rod, carrying out preliminary optimization on the parameters of coal mine coal bed blasting on a computer, and respectively carrying out numerical calculation on the explosive quantities of 2kg, 3kg, 4kg, 5kg, 6kg, 7kg and 8kg and the hole depths of 10m, 12m, 15m and 18 m;
s2, comprehensively considering the influence and pressure relief effect of blasting on a supporting structure, selecting coal bed blasting with parameters of 12m and 15m of hole depth and 2 kg-6 kg of explosive amount as a relatively good blasting scheme, and testing the optimization effect of pressure relief blasting design of a roadway through field actual measurement to ensure the practicability of the optimization result on the field;
s3, performing drilling peeping analysis on the coal seam blasting pressure relief effect, and performing drilling peeping by using an intelligent drilling television imager to detect the structure of a rock stratum in a rock stratum drilling hole;
s4, analyzing the peeping result:
(1): drilling a test hole: a common coal side anchor rod drilling machine can be used for drilling a phi 28mm hole, a side hole is drilled at the waist line position, and a top hole is drilled at the center line position of a top plate;
(2): cleaning the coal dust in the drilled hole: flushing the drill hole by water before and after blasting, cleaning up coal dust and drill slag in the drill hole, and opening a water valve of a drilling machine to flush the drill hole for 2min to the maximum after the hole is drilled to a specified position;
(3): the specific test process is as follows: after the drilling is finished, the drill pipe is placed for 30min, after water in the hole is drained, the equipment is started, the probe is pushed to the bottom of the hole at a constant speed of 1m/min by using a steel rod capable of being lengthened, the clarity of the probe is ensured in the whole process, and the probe is prevented from being shielded by water or pulverized coal;
s5, designing 4 testing stations in total, wherein the single-hole dosage is respectively 2kg, 3kg, 4kg and 5kg, each testing station respectively comprises 1 blasting pressure relief hole and 5 peepholes, the hole diameter of each blast hole is 42mm, the hole depth is 15m, the distances from the peepholes to the blast holes are respectively 1m, 2m, 3m, 4m and 5m, the hole diameter is 42mm, and the hole depth is 15 m;
s6, detecting peep holes of the coal body before and after blasting, comparing the development conditions of cracks in the holes before and after blasting, counting the positions of the holes each meter containing the length of a crack zone, drawing a corresponding histogram for analysis, uniformly counting the crack length within the range of 10m before and after blasting because more collapsed holes appear in the deep parts of the holes after blasting and the peep result of more than 10m is poor, uniformly counting the crack length within the range of 10m before and after blasting, wherein the crack development degree is higher as the distance from a roadway side is closer, the development positions of cracks are mostly concentrated in the interval of 5m away from the coal wall, for two sides, the range has less influence on the supporting quality outside a supporting structure, the integral supporting effect of the roadway is better, but a part of the range is in the longitudinal cracks of 2m, the range covers the anchoring section of an anchor rod, the influence on the supporting quality of the anchor rod is larger, the range is unfavorable to the supporting structure of the side part, and the control capability of, the impact resistance is poor;
s7, counting the cracks of the observation station with the dosage of 2kg, wherein all the peeping results of 5 peeping holes show an anchoring section 0-3 m away from the roadway side, the crack development has no obvious change, which indicates that the support influence of the blasting on the position is small, the cracks are increased in different degrees outside the anchoring section, the crack growth amplitude is reduced along with the increase of the distance between the peeping holes and the blasting holes, the crack width increase values of the 7m sections of the 5 peeping holes are respectively 357.14%, 87.5%, 38.23%, 18.22% and 9.18%, and the crack increase rate is 50% to serve as an effective pressure relief range, so that the coal body beyond 2m cannot be fully relieved under the condition of the dosage of 2 kg; the statistical situation of the cracks of the survey station with the dosage of 3kg is that the maximum increase value of the width of the cracks in an anchoring section 2m away from a roadway side is 5.35%, 10% of the maximum increase value is used as a standard for judging support damage, which indicates that the damage of the roadway caused by blasting belongs to an acceptable range, the cracks are increased in different degrees outside the anchoring section, the increase amplitude of the cracks is reduced along with the increase of the distance between a peeping hole and a blast hole, the increase values of the width of the cracks of 5 peeping holes in an 8m section are 426.14%, 217.52%, 73.25%, 22.13% and 9.54%, the increase rate of the cracks is 50% and is used as an effective pressure relief range, and coal bodies in a range of 3m away from the blast hole can be fully relieved under the condition that the dosage of 3 kg; according to the crack statistical condition of the survey station with the dosage of 4kg, the maximum crack width increase value of an anchoring section 2m away from a roadway side is 7.67%, 10% of crack width increase value serves as a standard for judging support damage, the damage of the roadway caused by blasting belongs to an acceptable range, cracks grow in different degrees outside the anchoring section, the crack growth amplitude decreases along with the increase of the distance between a peephole and a blast hole, the crack width increase values of 5 peepholes in a section of 5m are 487.23%, 245.75%, 86.15%, 42.73% and 13.54%, the crack increase rate is 50% and serves as an effective pressure relief range, coal bodies can be fully relieved within a range of 3m away from the blast hole under the condition that the dosage of 4kg, the average crack width increase value of the coal bodies is remarkably increased relative to the dosage of 3kg, and the pressure relief effect is good; according to the crack statistical condition of the observation station with the drug amount of 5kg, cracks grow to different degrees outside the anchoring section, the crack growth amplitude is reduced along with the increase of the distance between the peephole and the blast hole, the crack width increase values of 6m sections of 5 peepholes are 523.17%, 274.55%, 101.17%, 51.74% and 14.25%, the crack increase rate is 50%, and the coal body can be fully decompressed within the range of 4m from the blast hole under the condition that the drug amount is 5 kg. However, from the anchoring section 2m away from the roadway side, after blasting, the maximum increase value of the coal body fracture width reaches 15.42 percent, which exceeds the judgment standard of support damage, and shows that blasting causes obvious damage to roadway support, and the overall impact resistance of the roadway is reduced;
s8, analyzing the blasting pressure relief effect of the coal bed blasting by a drilling cutting method, wherein the drilling cutting method is used for respectively analyzing the blasting pressure relief effect of 12m hole depth and 2kg, 4kg and 5kg dosages, drilling cuttings are respectively taken once at the positions 1.5m away from two sides of a blasting hole before and after blasting, the average value of the drilling cuttings is measured twice, and drilling cutting curves before and after blasting are respectively obtained.
In conclusion, although the pressure relief effect of 5kg explosive blasting is the best, the maximum increase value of the coal body fracture of the anchoring section after blasting reaches 15.42%, the average loss rate of the axial force of the anchor rod also reaches 55%, the supporting quality is seriously influenced, the hole depth is increased to 18m, the average loss rate is reduced to 35%, and the hole depth is still larger; although the pressure relief effect of blasting with 4kg of explosive quantity is weakened relatively to 5kg, the maximum increase value of the fracture of the anchoring end after blasting is only 7.67%, the average loss rate of the fracture on the axial force is only 20% at most, and the blasting with 3kg and 2kg of explosive quantity has small damage to the fracture expansion of a supporting section and the axial force of an anchor rod, but the pressure relief effect is too low to prevent impact, so that the pressure relief effect of roadway support damage under blasting and the pressure relief effect of coal bed blasting are comprehensively considered, and 37075and city coal mine rock burst roadway blasting pressure relief parameters are optimized to be 15m in hole depth, 4kg of explosive quantity and 3-4 m in hole spacing.
The blasting pressure relief dosage of the rock burst roadway is temporarily set to 4kg according to tests, the hole depth is still 15m, on the premise of ensuring the pressure relief effect of the roadway, the axial force loss of the anchor rod caused by blasting dynamic load is effectively reduced, the deformation speed of surrounding rocks is obviously reduced, and the roadway casing repair frequency is reduced to 1 from 3 times per month.
The method is characterized in that numerical simulation and field actual measurement are combined, a pressure relief blasting design optimization technology taking 'field actual measurement of blasting vibration basic parameters → blasting vibration mechanism analysis → numerical simulation optimization of multiple groups of blasting schemes → field inspection of danger relieving effect of optimized schemes' as steps is established, and the coal industry blasting design is optimized to have the hole depth of 15m, the explosive quantity of 4kg and the hole spacing of 3.5m as the best.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (1)
1. A deep well impact dangerous roadway branch-unloading coupling scour prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1, adopting a dynamic damage model of the axial force of the anchor rod, carrying out preliminary optimization on the parameters of coal mine coal bed blasting on a computer, and respectively carrying out numerical calculation on the explosive quantities of 2kg, 3kg, 4kg, 5kg, 6kg, 7kg and 8kg and the hole depths of 10m, 12m, 15m and 18 m;
s2, comprehensively considering the influence and pressure relief effect of blasting on a supporting structure, selecting coal bed blasting with parameters of 12m and 15m of hole depth and 2 kg-6 kg of explosive amount as a relatively good blasting scheme, and testing the optimization effect of pressure relief blasting design of a roadway through field actual measurement to ensure the practicability of the optimization result on the field;
s3, performing drilling peeping analysis on the coal seam blasting pressure relief effect, and performing drilling peeping by using an intelligent drilling television imager to detect the structure of a rock stratum in a rock stratum drilling hole;
s4, analyzing the peeping result:
(1): drilling a test hole: a common coal side anchor rod drilling machine can be used for drilling a phi 28mm hole, a side hole is drilled at the waist line position, and a top hole is drilled at the center line position of a top plate;
(2): cleaning the coal dust in the drilled hole: flushing the drill hole by water before and after blasting, cleaning up coal dust and drill slag in the drill hole, and opening a water valve of a drilling machine to flush the drill hole for 2min to the maximum after the hole is drilled to a specified position;
(3): the specific test process is as follows: after the drilling is finished, the drill pipe is placed for 30min, after water in the hole is drained, the equipment is started, the probe is pushed to the bottom of the hole at a constant speed of 1m/min by using a steel rod capable of being lengthened, the clarity of the probe is ensured in the whole process, and the probe is prevented from being shielded by water or pulverized coal;
s5, designing 4 testing stations in total, wherein the single-hole dosage is respectively 2kg, 3kg, 4kg and 5kg, each testing station respectively comprises 1 blasting pressure relief hole and 5 peepholes, the hole diameter of each blast hole is 42mm, the hole depth is 15m, the distances from the peepholes to the blast holes are respectively 1m, 2m, 3m, 4m and 5m, the hole diameter is 42mm, and the hole depth is 15 m;
s6, detecting the coal body peep holes before and after blasting, comparing the crack development conditions in the holes before and after blasting, counting the positions of the holes each meter of which contains the length of a crack zone, drawing a corresponding histogram for analysis, and uniformly counting the crack length in the range of 10m before and after blasting because more collapsed holes appear in the deep parts in the holes after blasting and the peeping result of more than 10m is poor;
s7, counting the crack of the survey station with the dosage of 2kg, and displaying the anchoring section 0-3 m away from the lane wall by all the 5 peephole peeping results; the crack statistical condition of the testing station with the dosage of 3kg, the maximum crack width increase value of an anchoring section 0-3 m away from the roadway side is 5.35%, and 10% of the crack width is used as the judgment standard of support damage; the crack statistical condition of the testing station with the dosage of 4kg, the maximum crack width increase value of an anchoring section 0-3 m away from the roadway side is 7.67%, and 10% of the crack width is used as the judgment standard of support damage; the statistical condition of the cracks of the observation station with the dosage of 5kg, the cracks are increased in different degrees outside the anchoring section, the crack growth amplitude is reduced along with the increase of the distance between the peephole and the blast hole, and the crack width increase values of the 5 peepholes in the section of 3-10 m are 523.17%, 274.55%, 101.17%, 51.74% and 14.25% respectively;
and S8, analyzing the coal bed blasting pressure relief effect by a drilling cutting method, respectively analyzing the blasting pressure relief effect of 12m hole depth and 2kg, 4kg and 5kg of explosive quantity, respectively taking drilling cuttings once at positions 1.5m away from two sides of a blasting hole before and after blasting, and then measuring the average value of the drilling cuttings twice to respectively obtain drilling cuttings curves before and after blasting.
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