CN113216981A - Method for relieving danger of rock burst of deep-buried roadway - Google Patents
Method for relieving danger of rock burst of deep-buried roadway Download PDFInfo
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- CN113216981A CN113216981A CN202110556502.2A CN202110556502A CN113216981A CN 113216981 A CN113216981 A CN 113216981A CN 202110556502 A CN202110556502 A CN 202110556502A CN 113216981 A CN113216981 A CN 113216981A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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Abstract
The invention discloses a method for relieving danger caused by rock burst of a deep-buried roadway, which comprises the following steps of: (1) a roadway support layer, a soft energy absorption layer and a hard rock primary layer which define roadway wall rock mass of the roadway; (2) selecting a plurality of sections along the roadway, and drilling a plurality of blasting pressure relief holes in each section; (3) the blasting and grouting integrated system is formed by respectively filling a PVC pipe, a blasting unit, clay foam mud, grouting holes and the like into each blasting pressure relief hole; (4) igniting the blasting unit for detonation to enable the soft energy absorption layer and the roadway support layer to form radial cracks and circumferential tangential cracks; (5) and after blasting, adopting a high-pressure cement grouting machine to perform grouting reinforcement on the roadway support layer through the grouting hole of the PVC pipe. The invention solves the problem of relieving rock burst of a deep-buried roadway by a blasting pressure relief method.
Description
Technical Field
The invention relates to the field of mine underground roadway punching removal methods, in particular to a method for relieving dangers of rock burst of a deep-buried roadway.
Background
Rock burst is a dynamic destruction phenomenon of brittle fracture of rock mass like explosion due to the fact that surrounding rock strength cannot bear excessive stress concentration in the construction and operation processes of deep-buried underground engineering, and often causes outburst type destruction, equipment damage and casualties of an excavation working face. People can not completely master the occurrence conditions of the rock burst, so that the development arrangement and the mining mode are unreasonable, precautionary measures are not taken in advance or are incomplete, and high stress concentration and rock burst danger of local coal bed sections are inevitably formed. Therefore, these sections must be monitored and endangered in time during coal mining to ensure safe production.
The existing danger relieving means of rock burst comprise blasting pressure relief, drilling pressure relief, induced blasting and the like. The blasting pressure relief is a danger relieving measure for reducing the stress concentration degree of a rock body with an impact danger by using a deep hole blasting method; the drilling pressure relief is based on the drilling impact phenomenon generated during drilling by a construction drilling cutting method, a certain crushing area is formed around each drilling hole, and after the crushing areas are developed, a rock stratum fracture pressure relief area is formed, so that danger relief measures for eliminating or slowing the rock burst danger are taken; the induced blasting is a danger relieving measure which artificially induces rock burst by utilizing more explosive amount to blast under the condition that the danger of the rock burst is detected, so that the rock burst is generated in a certain time and place, and further, the greater damage is avoided.
At present, the blasting pressure relief method is widely applied to rock burst danger relieving, and a person skilled in the art proves that the blasting pressure relief method is suitable for the rock burst danger relieving of deep-buried underground engineering by combining experiments. However, the traditional rock burst pressure relief danger relieving means has the following problems:
(1) the requirement for long-term suppression of roadway rock burst: the blasting pressure relief technology has a good effect of preventing and controlling rock burst in the roadway in a short period, but along with the increase of the service life of the roadway, the stress transfer weakens the surrounding rock of the roadway, the supporting strength of the roadway is reduced, and the inner side support and the external pressure relief of the roadway cannot be simultaneously met. Meanwhile, under the action of compressive stress induced by gradual excavation and tunneling of the roadway, micro-fractures formed locally in the surrounding rock are further gathered and communicated, and the integrity of the surrounding rock is greatly reduced. Therefore, the conflict between the inner side support and the external pressure relief of the roadway is solved, and the establishment of a long-term coordination mechanism of the inner side support and the external pressure relief of the roadway is the urgent necessity for relieving the danger of rock burst.
(2) Blasting causes the destruction of roadway support structures: the traditional rock burst pressure relief danger relieving means neglects the damage to the stability of the surrounding rock of the roadway due to the burst spread, and lacks means for repairing, observing and repairing the supporting area of the roadway after the burst and evaluating the repairing quality in the actual engineering, so that the damage rate of the surrounding rock damage in the running and excavation processes of the roadway is gradually improved.
(3) Observation problems for blast zone: the method is influenced by the underground complex natural environment, lacks of visual observation of a blasting area, has blindness in selection of blasting parameters such as explosive types, explosive loading amount and explosive charging structure, is easy to misjudge dangerous sources such as explosive gas and ventilation conditions, influences safety standards for dividing blasting dangerous areas, and threatens life and property safety.
(4) The construction period is long, and the cost is high: the traditional explosion pressure relief danger relieving means needs the use of a large number of professional instruments and the mutual cooperation of different workers, the construction procedure is complex, the construction period is long, and the labor cost is high.
Disclosure of Invention
The invention aims to provide a method for relieving danger of rock burst of a deep-buried roadway, which aims to solve the problem existing in the prior art that the rock burst of the deep-buried roadway is relieved by adopting a blasting pressure relief method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a method for relieving danger caused by rock burst of a deep-buried roadway, which is used for establishing a three-layer strong and weak structure comprising a hard original rock layer, a soft energy absorbing layer and a roadway support layer from far to near around the roadway, wherein the roadway support layer is used for supporting the stability of the roadway and has the thickness of 1-2 times of the height of the roadway; the soft energy absorption layer is a soft crushing structure for scattering and absorbing impact shock waves, and the thickness of the soft energy absorption layer is 1-2 times of the height of the roadway; the hard original rock stratum is an undisturbed rock mass on the outer side of the soft energy absorption layer; therefore, the defects and problems still existing in the traditional rock burst pressure relief and danger relieving means are solved.
The invention also establishes an integrated system for blasting and grouting, wherein the integrated system for blasting and grouting comprises a PVC pipe, an explosive package, clay foam mud, a diaphragm, a detonator leg wire and a high-pressure cement grouting machine. The PVC pipe is the main part of blasting and slip casting integration system, divide into the three-section along the axial, and wherein the first section is the blasting section, and the interlude is the hole sealing section, and the third section is the slip casting section that has the through-hole. The blasting section of the PVC pipe is divided into a plurality of explosive loading compartments by a plurality of diaphragms which are axially distributed, the rock body position corresponding to each explosive loading compartment is respectively used as a main blasting point, each explosive loading compartment is respectively provided with an explosive bag and a blasting unit formed by a detonator, so that the explosives are arranged at intervals, and the explosive power is gradually weakened along with the reduction of the distance from the third section of grouting section. And clay foam mud is filled in the hole sealing section for sealing holes. The leg wires of the detonators are connected in parallel and then converged into one strand, and the leg wires are ignited by detonation to detonate the explosive package; the detonator leg wire is wrapped by waterproof insulating tape and is led out of the hole opening of the blasting pressure relief hole; the solid part in the range of the grouting section is provided with 40 plum-blossom-shaped grouting holes with the diameter of 5 mm.
The invention comprises the following steps:
(1) ground penetrating radar observation of blasting area rock mass before blasting
Before observation, cleaning sundries in the roadway, and ensuring that the ground penetrating radar is attached to the surface of the surrounding rock body of the roadway to be detected to the greatest extent; during observation, the ground penetrating radar receiving and transmitting integrated antenna is installed and fixed on the trolley through a support, the ground penetrating radar is debugged, parameter setting is carried out, and a survey area coordinate is established; turning on a power supply, starting transmitting and receiving electromagnetic wave signals by the receiving and transmitting integrated antenna, enabling the trolley to move at a constant speed by clinging to the surface of a roadway wall rock mass of the roadway to be detected, and ensuring that the receiving and transmitting integrated antenna does not touch two side walls of the roadway in the moving process, so that the trolley fixed with the receiving and transmitting integrated antenna can stably move at a constant speed; and after the trolley reaches the designated position, storing observation data, performing data processing, acquiring a ground penetrating radar image of an observation area, and determining the thicknesses of a roadway supporting layer, a soft energy absorption layer and a hard original rock layer through the detection radar image.
And finishing detection, and dismantling the ground penetrating radar exploration system. And collecting a geological survey report of the blasting area, comparing the geological survey report with the ground penetrating radar image of the rock mass of the blasting area, determining blasting parameters such as explosive types, explosive loading amount and explosive loading structure, and providing a theoretical basis for the expansion of the subsequent blasting operation.
(2) Blasting pressure relief and grouting reinforcement
In a roadway with a rock burst danger, well performing roadway support and safety measures; the blasting pressure relief holes are drilled in the surrounding rock along the circumferential direction on a plurality of sections of the roadway, 4-5 blasting pressure relief holes are uniformly distributed in each section, the hole depth is 3-5 times of the height of the roadway, and the blasting pressure relief holes in adjacent sections are staggered in a one-to-one correspondence mode.
According to the comparison analysis of the ground penetrating radar result of the rock mass in the blasting area and the geological survey report, explosive packages corresponding to the rock mass in the blasting area are loaded in the blasting section of the PVC pipe, and a detonator leg wire are arranged; and filling clay foam mud between the hole sealing sections of the PVC pipes for hole sealing after blasting to reduce the influence of blasting on the grouting section, and arranging a plurality of grouting holes in the grouting section of the PVC pipes so as to perform grouting reinforcement on the surrounding rock mass in the roadway supporting area after blasting.
Placing the installed PVC pipe into a blasting pressure relief hole, defining the boundary of a blasting danger area, detonating each explosive charge of a blasting section of the PVC pipe through a detonator after safety measures are made, forming radial cracks and circumferential tangential cracks on a weak energy absorption layer and a roadway support layer under the action of blasting shock waves and stress waves, wherein the radial cracks formed in the weak energy absorption layer and the roadway support layer are staggered mutually due to different inclination angles of the blasting pressure relief holes of adjacent sections, so that a through crack area is more difficult to form; and after blasting, adopting a high-pressure cement grouting machine to perform grouting reinforcement on the roadway support layer affected by blasting waves through a grouting hole of the PVC pipe grouting section, and infiltrating slurry into the roadway support layer under the action of pressure to reinforce the roadway support area.
(3) Ground penetrating radar detection of blasting effect and grouting quality and regular monitoring of roadway surrounding rock mass
And after blasting pressure relief and grouting consolidation, detecting in the same way by the ground penetrating radar again, and performing nondestructive detection on the rock mass structures of the blasting area and the grouting area.
The damage area change of the profile of the ground penetrating radar before and after blasting of the rock mass in the blasting area and the reduction of the electromagnetic wave speed show better corresponding relation, so that the damage area and position of the blasting area can be obtained.
Abnormal media such as a grouting mass defect area, a void area and the like are scattered under the action of elastic waves and electromagnetic waves, and the positions of the abnormal body and the defect can be determined by detecting a scattering signal of the abnormal body.
Comparing and analyzing the ground penetrating radar result data before and after blasting and grouting, and evaluating blasting effect and grouting quality; and in the later stage, rock stress distribution changes and rock burst possibly occurs along with continuous mining of the working face, and continuous safety monitoring and stability early warning evaluation are carried out on blasting, grouting and supporting and reinforcing roadway surrounding rock structure changes in the process.
In conclusion, the method for solving the danger of the rock burst of the deep-buried roadway based on blasting, grouting and monitoring is designed based on the strong and weak structure theory for controlling the impact of surrounding rocks of the roadway, aiming at the requirements of safely, effectively and quickly solving the danger of the rock burst of the deep-buried roadway, improving the observation resolution of a blasting area, relieving the damage of blasting to a roadway supporting structure, simplifying field operation procedures, reducing related construction cost and inhibiting the occurrence of the disaster of the rock burst of the roadway for a long time.
The invention specifically provides and designs a safe, effective and rapid method for relieving the rock burst of the deep-buried roadway aiming at the problems and requirements in the conventional blasting pressure relief and danger relieving means, and provides a detailed description of the construction process of two subsystems of the system, namely a blasting and grouting integrated system and a ground penetrating radar exploration system.
Compared with the prior art, the invention has the beneficial effects that:
(1) strong and weak anti-impact structures are built around the roadway, the contradiction between the inner side support and the external pressure relief of the roadway is coordinated, the safe, effective and rapid danger relieving requirements of deep-buried underground engineering on rock burst are met, the occurrence of the disaster of the rock burst of the roadway is effectively prevented, and the supporting and pressure relief effects of the roadway are improved.
(2) The adjacent section blasting pressure relief holes are arranged in a staggered mode, cracks formed in the weak energy absorption layer and the roadway support layer after blasting are not communicated with each other, so that the distribution range of the cracks in the weak energy absorption layer after further excavation and operation of the roadway is wider, a full-coverage crack net can be established at the periphery of the roadway support layer, the possibility that cracks in the roadway support layer are communicated to form a serious damage area is reduced, the difficulty of subsequent grouting and reinforcing work is reduced, meanwhile, the surrounding rock body in the roadway reinforcing and supporting area can generate certain degree of coordinated deformation, and the requirement that the roadway inhibits rock burst for a long time is met.
(3) The invention provides an integrated device for blasting and grouting, which simplifies the construction process, reduces the working strength and shortens the working time; the blasting section is divided into a plurality of main blasting points aiming at the rock mass in the blasting area, so that the use of explosives is saved, and the excessive breakage of the rock mass in the fracturing area is avoided; the tunnel support area is reinforced and repaired through the grouting section after blasting, the influence of blasting wave on the surrounding rock body structure of the tunnel support area is reduced, the whole instability of the tunnel support area is prevented, and the service life of the tunnel is prolonged.
(4) The invention provides ground penetrating radar detection of a surrounding rock structure of a roadway before and after blasting and grouting construction, contrasts and analyzes blasting effect, grouting quality and stability detection data of the surrounding rock of the roadway, monitors the surrounding rock of the roadway periodically during mining of a working face, grasps the evolution condition of the surrounding rock structure of the blasting, grouting and supporting reinforcing section, and timely warns and makes a solution for danger.
Drawings
Fig. 1 is a schematic diagram of strong and weak scour prevention of a roadway section.
Fig. 2 is a schematic diagram of arrangement of blasting pressure relief holes in different sections of a roadway.
Fig. 3 is a schematic diagram of an integrated blasting and grouting system.
Fig. 4 is a working flow chart of a deep-buried roadway rock burst danger relieving method based on blasting, grouting and monitoring.
The reference numbers in the figures illustrate:
1-blasting pressure relief hole, 2-PVC pipe, 3-explosive package, 4-detonator, 5-diaphragm, 6-clay bubble mud, 7-grouting hole, 8-detonator leg wire and 9-detonator leg wire.
A-roadway support layer, B-soft energy absorption layer, C-hard original rock layer, D1-blasting pressure relief hole of first section and D2-blasting pressure relief hole of second section adjacent to the first section.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, fig. 1 is a schematic diagram of a strong and weak scour prevention structure of a roadway section, which is an ideal roadway scour prevention structure to be realized by the invention, and specifically is a three-layer strong and weak strong structure of a hard original rock stratum C, a soft energy absorbing layer B and a roadway supporting layer a which are built around the roadway from far to near, wherein the roadway supporting layer a is used for supporting the stability of the roadway and has a thickness 1-2 times of the height of the roadway; the soft energy absorption layer B is a soft crushing structure for scattering and absorbing impact shock waves, the thickness of the soft energy absorption layer B is 1-2 times of the height of a roadway, and the hard original rock stratum C is an undisturbed rock mass on the outer side of the soft energy absorption layer.
Fig. 2 is a schematic diagram of arrangement of blasting pressure relief holes in different sections of a roadway. In a roadway with a rock burst danger, well performing roadway support and safety measures; during construction, a drilling machine starts to work after hole position location and lofting of a drill hole are carried out according to design coordinates and elevations; and drilling blasting pressure relief holes along the surrounding rock on the section of the roadway at intervals of 5m in the roadway along the circumferential direction, wherein the hole diameter is 55mm, and the hole depth is 3-5 times of the height of the roadway. Taking the adjacent section I and the section 2 as examples, the section I and the section II are two construction templates for drilling the blasting pressure relief hole in the section of the roadway; 5 blasting pressure relief holes D1 are arranged in the first set section, and the inclination angles are respectively 0 degree, 45 degrees, 90 degrees, 135 degrees and 180 degrees; 4 blasting pressure relief holes D2 are arranged in the second set section, and the inclination angles are 22.5 degrees, 67.5 degrees, 112.5 degrees and 157.5 degrees respectively; the positions of the blasting pressure relief holes of the first section and the second section are staggered one by one. And blasting pressure relief holes of each section of the whole roadway are arranged by taking the section I and the section II as templates.
Fig. 3 is a schematic diagram of an integrated blasting and grouting system, which mainly comprises a PVC pipe 2, an explosive package 3, a detonator 4, a diaphragm 5, clay foam 6, a grouting hole 7 and a detonator leg wire 8. Cleaning impurities in a roadway, installing a ground penetrating radar exploration system, collecting data, acquiring a ground penetrating radar image of a rock body in a blasting area, comparing and analyzing the ground penetrating radar image with a geological survey report, determining blasting parameters such as explosive types, explosive loading amounts and loading structures, and providing a theoretical basis for the expansion of the subsequent blasting work; the diameter of the PVC pipe 2 is set to be 50mm, and the length of the PVC pipe is slightly smaller than the depth of the blasting pressure relief hole; the upper section of the PVC pipe is a blasting section, the length of the PVC pipe is 1-2 times of the height of the roadway, and the PVC pipe is used for blasting the weak energy absorption layer; the lower section of the PVC pipe is a grouting section, the length of the PVC pipe is 1-2 times of the height of the roadway, and the PVC pipe is used for grouting reinforcement of the roadway support layer; 4 groups of explosive bags 3 corresponding to the rock mass in the blasting area are arranged in the blasting section of the PVC pipe 2 at intervals in a targeted manner, the interval between the explosive bags is 1-3 m, the blasting section is divided into 4 explosive charging compartments by a diaphragm 5, the explosive bags 3 and the detonators 4 are arranged in a single compartment, the detonators 4 are connected in parallel to form a strand through detonator leg wires 8, and the detonator leg wires 8 are wrapped by waterproof insulating tapes and extend out of the hole openings; arranging clay foam mud 6 at a hole sealing section between the upper section and the lower section of the PVC pipe 2 for sealing holes after blasting to reduce the influence of blasting on the lower section of the PVC pipe in the hole, and arranging 40 plum blossom-shaped grouting holes 7 with the aperture of 5mm at the lower section of the PVC pipe so as to facilitate grouting and reinforcing the rock mass in the roadway supporting area after blasting; and placing the installed PVC pipe into the blasting pressure relief hole 1.
As shown in fig. 4, the boundary of the blasting dangerous area is defined, after safety measures are taken, a detonator is used for detonating an explosive charge on the upper section of the PVC pipe, under the action of blasting shock waves and stress waves, the weak energy absorption layer B and the roadway support layer a can form radial cracks and circumferential tangential cracks, and due to different inclination angles of blasting pressure relief holes of adjacent sections, the radial cracks formed in the weak energy absorption layer B and the roadway support layer a are staggered with each other, so that a through crack area is more difficult to form.
After blasting, the ground penetrating radar exploration system is used for carrying out nondestructive testing on rock mass structures of the blasting area and the prepared grouting area, blasting area ground penetrating radar result data before and after blasting are contrastively analyzed, blasting effect is evaluated, meanwhile, the obtained prepared grouting area ground penetrating radar result data can provide theoretical basis for grouting reinforcement work later, and grouting parameters such as grouting amount, grouting pressure and grouting speed are determined. And (3) grouting and reinforcing the roadway support layer A affected by the blasting wave by using a high-pressure cement grouting machine through a grouting hole 7 at the lower section of the PVC pipe, and enabling the grout to permeate into the roadway support layer A under the action of pressure to reinforce the roadway support layer A. And after grouting construction is finished, detecting a grouting area by using a ground penetrating radar exploration system, and evaluating grouting quality of the grouting area according to comparative analysis of ground penetrating radar result data before and after grouting construction. And in the later stage, rock stress distribution changes and rock burst possibly occurs along with continuous mining of the working face, and continuous safety monitoring and stability early warning evaluation are carried out on blasting, grouting and supporting and reinforcing roadway surrounding rock structure changes in the process.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (6)
1. The method for relieving the rock burst of the deep-buried roadway is characterized by comprising the following steps of:
(1) measuring the roadway wall rock mass of the roadway to obtain rock mass structure data, and determining the thicknesses of a roadway support layer, a soft energy absorbing layer and a hard rock primary layer in the roadway wall of the roadway based on the rock mass structure data, wherein the roadway support layer, the soft energy absorbing layer and the hard rock primary layer are sequentially distributed from inside to outside; arranging blasting pressure relief holes according to a confined roadway support layer, a soft energy absorption layer and a hard rock original layer, wherein the length of each blasting pressure relief hole is equivalent to the total thickness of the soft energy absorption layer and the roadway support layer, blasting sections in the blasting pressure relief holes form a crushing area through explosive blasting, so that the soft energy absorption layer is established, and a grouting section at the lower section is used for grouting and reinforcing the roadway support layer, so that the blasting damage is reduced, and the stability of the roadway is maintained;
(2) selecting sections of a plurality of roadways distributed along the trend of the roadway, drilling a plurality of blasting pressure relief holes in a roadway wall rock mass along the circumferential direction of each section, wherein each blasting pressure relief hole extends into a boundary between a soft energy absorption layer and a hard rock original layer, and the positions of the plurality of blasting pressure relief holes of adjacent sections are staggered one by one;
(3) respectively filling a PVC pipe into each blasting pressure relief hole, wherein a pipe orifice at one end of each PVC pipe extends into the blasting pressure relief hole to a position close to a boundary line between a soft energy absorption layer and a hard rock original layer, and a pipe orifice at the other end of each PVC pipe is flush with or close to a hole orifice of the blasting pressure relief hole; the PVC pipe is divided into three sections along the axial direction, wherein one section close to the pipe orifice of the PVC pipe deep into the blasting pressure relief hole is used as a blasting section, one section close to the pipe orifice at the other end of the PVC pipe is used as a grouting section, a hole sealing section is arranged between the blasting section and the grouting section, the blasting section is completely positioned in the blasting pressure relief hole corresponding to the weak energy absorption layer, and the grouting section is completely positioned in the blasting pressure relief hole corresponding to the roadway support layer; a plurality of blasting units are axially arranged in the blasting section, clay foam mud is filled in the hole sealing section, a plurality of rows of grouting holes 7 are axially arranged on the wall of the grouting section in the blasting pressure relief hole, the grouting holes 7 are uniformly distributed in each row and staggered with each other, and a lead of each blasting unit sequentially penetrates through the blasting section, the clay foam mud and the grouting section and then is led out from a pipe orifice at the other end of the PVC pipe;
(4) igniting a lead of the blasting unit to explode the blasting unit of the blasting section in the PVC pipe in each blasting pressure relief hole, and enabling the soft energy absorption layer and the roadway support layer to form radial cracks and circumferential tangential cracks under the action of blasting shock waves and stress waves, wherein the soft energy absorption layer of the adjacent section and the radial cracks formed in the roadway support layer are mutually staggered;
(5) and (4) after the blasting is finished according to the step (4), grouting the roadway supporting layer affected by the blasting wave through a grouting hole of the PVC pipe by using a high-pressure cement grouting machine, and infiltrating the grout into the roadway supporting layer under the action of pressure to reinforce the roadway supporting layer.
2. The method for relieving the danger by the rock burst of the deep-buried roadway according to claim 1, wherein in the step (1), a ground penetrating radar is adopted to measure roadway wall rock mass of the roadway, the ground penetrating radar is enabled to cling to the rock mass of the roadway wall, the ground penetrating radar is enabled to move at a constant speed along the roadway wall, a geological survey report of a blasting area is collected according to image data obtained by the measurement of the ground penetrating radar, the geological survey report is compared with a ground penetrating radar image of the rock mass of the blasting area, blasting parameters such as explosive types, explosive loading amounts and explosive loading structures are determined, and a theoretical basis is provided for the expansion of the blasting work.
3. The method for breaking dangers through impact pressure in a deep-buried roadway according to claim 1, wherein in the step (2), a plurality of blasting pressure relief holes in the circumferential direction of each section are uniformly distributed at equal intervals, and the intervals of adjacent blasting pressure relief holes in different sections are different, so that the blasting pressure relief holes in adjacent sections are staggered one by one.
4. The method for breaking danger by impact in a deep-buried roadway according to claim 1, wherein in the step (3), the explosion section of each PVC pipe is divided into a plurality of spaces by a plurality of diaphragms distributed along the axial direction, each space is provided with an explosion unit independently, each explosion unit is composed of an explosive bag and a detonator, each explosion unit takes a leg wire of the detonator as a lead, and the leg wires of the detonators are converged into one strand and then led out from the pipe orifice at the other end of the PVC pipe.
5. The method for relieving dangers caused by impact pressure in the deep-buried roadway according to claim 1 or 2, further comprising the step (6): and (3) after grouting is finished, obtaining roadway wall rock mass structure data of the roadway by adopting the ground penetrating radar again and based on the measuring process in the step (1), and carrying out nondestructive testing on the rock mass corresponding to the blasting section and the rock mass corresponding to the grouting section based on the rock mass structure data obtained by measuring again.
6. The method for breaking the danger by rock burst of the deep-buried roadway according to claim 5, wherein in the step (6), the rock damage area and position corresponding to the blasting section are determined based on the corresponding relation between the damage area change of the profile of the ground penetrating radar before and after blasting of the rock of the blasting section and the speed reduction of the electromagnetic wave;
based on the principle that abnormal mediums of a grouting mass defect area and a void area are scattered under the action of elastic waves and electromagnetic waves, the positions of the abnormal mediums and the defects of the rock mass corresponding to the grouting section are determined by detecting scattering signals of the abnormal mediums.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320318A (en) * | 2022-03-16 | 2022-04-12 | 华北科技学院(中国煤矿安全技术培训中心) | In-situ modification anti-scour method for coal mine roadway surrounding rock |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320318A (en) * | 2022-03-16 | 2022-04-12 | 华北科技学院(中国煤矿安全技术培训中心) | In-situ modification anti-scour method for coal mine roadway surrounding rock |
| CN114320318B (en) * | 2022-03-16 | 2022-06-17 | 华北科技学院(中国煤矿安全技术培训中心) | In-situ modification anti-scour method for coal mine roadway surrounding rock |
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Application publication date: 20210806 |