CN-122019930-A - Method and system for pressure relief of double-area pre-slitting of lateral top plate

CN122019930ACN 122019930 ACN122019930 ACN 122019930ACN-122019930-A

Abstract

The invention relates to the technical field of coal mine safety exploitation, and discloses a method and a system for pressure relief of a double-area pre-slitting of a lateral roof, wherein the method comprises the steps of measuring the range of a loose circle of surrounding rock to calculate an initial pressure relief position; the method comprises the steps of establishing a stress dynamic monitoring array in a section coal pillar, collecting data in real time and extracting a stress concentration peak value distance of a solid coal side, preferentially determining a vertical height of a pressure relief horizon according to geological parameters and a cover rock structure, calculating first-stage parameters such as a drilling deflection angle and the like based on the variables, preferentially slitting the solid coal side of an adjacent working face, tracking a stress redistribution state in an observation window period, obtaining a peak value distance corrected by an auxiliary transportation retaining side, and accordingly calculating second-stage parameters and finishing differential slitting. According to the invention, a dynamic closed loop feedback mechanism is constructed through a double-region and step-by-step timing strategy, so that the joint cutting position is ensured to be always and accurately matched with the mining stress extremum region, the high stress transmission is effectively blocked, and the problem of surrounding rock instability induced by lateral support pressure superposition is solved.

Inventors

GAO XIAOJIN
MA RONGSHAN
WU YONGZHENG
ZHANG ZHEN
HUANG ZHIZENG
XUE JISHENG
LI ZHENGJIE
LIU QIANJIN
LIU XIAOGANG
LIN XINGYU

Assignees

中煤科工开采研究院有限公司
天地科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260106

Claims (12)

1. A method for pressure relief of a double-region pre-slit of a lateral top plate, comprising the steps of: S100, measuring the loose circle range of surrounding rocks at the shallow part of the roadway by using a surrounding rock parameter detection unit, and calculating an initial pressure relief position based on the loose circle range to finish boundary calibration of the initial state of the surrounding rocks of the roadway; S200, collecting monitoring data in real time through a stress dynamic monitoring array deployed in a section coal pillar, and extracting a solid coal side peak value distance representing stress concentration degree based on the monitoring data; S300, combining the geological parameters of the working face coal bed and the structural characteristics of the overlying strata, and preferentially determining the vertical height of the pressure relief horizon through numerical judgment; S400, calculating a first-stage construction parameter by taking the peak distance of the solid coal side and the vertical height of the pressure relief horizon as input variables, and preferentially implementing drilling and lancing on the solid coal roadway side of the adjacent working face to form a first-stage lancing structure; S500, tracking a stress redistribution state by using the stress dynamic monitoring array in an observation window period after the first-stage kerf structure is formed, and acquiring an auxiliary transportation roadway-side peak value distance after time sequence evolution correction; and S600, calculating a second-stage construction parameter by taking the peak value distance of the auxiliary transportation roadway-retaining side and the vertical height of the pressure relief horizon as input variables, and implementing differential drilling on the auxiliary transportation roadway-retaining side to complete the construction of the lateral roof double-area pressure relief system.
2. The method of double-region pre-slit pressure relief of a side roof according to claim 1, wherein in step S100, said calculating a starting pressure relief position based on said loosening range comprises: the data processing and decision center receives the loosening range and sets a preset safety margin constant; And (3) calling a position calculation formula to calculate the loosening range and the safety margin constant, outputting the plane projection distance of the initial pressure relief position, and setting the plane projection distance as the initial depth of the outermost sensor in the stress dynamic monitoring array.
3. The method for pressure relief of double-zone pre-lancing of a lateral roof according to claim 2, wherein in step S200, the monitoring data is collected in real time by a dynamic stress monitoring array deployed inside a section coal pillar, specifically comprising: Planning the installation depth of each drilling stress meter in the stress dynamic monitoring array according to the plane projection distance and the geometric dimension of the section coal pillar; Sequentially burying drilling stress meters along the depth direction according to the installation depth, and constructing the stress dynamic monitoring array with coverage extending from the boundary of the shallow loosening ring to the deep elastic nuclear region of the coal pillar; and sensing vertical stress change in the coal body by using the stress dynamic monitoring array, generating monitoring data, identifying local maximum points of the lateral supporting pressure distribution state in the monitoring data, and extracting coordinates corresponding to the local maximum points as the peak value distance of the coal side of the entity.
4. The method of dual-zone pre-slit pressure relief of a side roof panel according to claim 3, wherein in step S300, the preferentially determining the vertical height of the pressure relief horizon comprises: Acquiring the average mining thickness of the working face coal bed, the crushing expansion coefficient of the goaf caving rock mass and the inclination angle of the coal bed, substituting the average mining thickness, the crushing expansion coefficient and the inclination angle into a theoretical caving zone height calculation formula, and calculating the theoretical caving zone height; Obtaining the layer height of the hard top plate, and comparing the layer height of the hard top plate with the height of the theoretical collapse zone in a numerical value manner; If the height of the layer of the hard top plate is larger than the height of the theoretical collapse zone, judging that the vertical height of the pressure relief layer is equal to the height of the layer of the hard top plate; and if the height of the layer of the hard top plate is smaller than or equal to the height of the theoretical collapse zone, judging that the vertical height of the pressure relief layer is equal to the height of the theoretical collapse zone.
5. The method for pressure relief of double-section pre-slit of lateral roof according to claim 1, wherein in step S400, the resolving the first stage construction parameters specifically comprises: Setting the shoulder angle of the top plate of the solid coal roadway of the adjacent working face, which is close to the coal pillar, as the origin of a local construction coordinate system; Substituting the vertical height of the pressure relief horizon and the peak value distance of the solid coal side as input parameters into a first drilling deflection angle calculation formula to calculate a first deflection angle; substituting the vertical height of the pressure relief horizon and the peak value distance of the solid coal side as input parameters into a first drilling total length calculation formula to calculate the total length of the solid coal side drilling.
6. The method of double-section pre-slit pressure relief of a side roof panel according to claim 5, wherein in step S400, said resolving the first stage construction parameters further comprises: Invoking a first charge initial position calculation formula to calculate the initial pressure relief position, the solid coal side peak value distance and the total length of the solid coal side drilling hole obtained by calculation in the step S100, and calculating the solid coal side charge initial position; And combining and packing the first deflection angle, the total length of the solid coal side drilling hole and the solid coal side medicine loading initial position to generate a first-stage construction parameter.
7. The method for pressure relief of double-section pre-slit of lateral roof according to claim 1, wherein in step S600, the calculating the second stage construction parameters specifically comprises: Substituting the vertical height of the pressure relief horizon and the peak value distance of the auxiliary transportation roadway-retaining side into a second drilling deflection angle calculation formula as input parameters to calculate a second deflection angle; substituting the vertical height of the pressure relief horizon and the peak value distance of the auxiliary transportation entry retaining side into a second drilling total length calculation formula as input parameters to calculate the auxiliary transportation entry retaining side drilling total length.
8. The method of dual-zone pre-slit pressure relief of a side roof panel according to claim 7, wherein in step S600, said solving the second stage construction parameters further comprises: based on a geometrical similarity projection principle, a second charge starting position calculation formula is called to calculate the starting pressure relief position, the auxiliary transportation entry retaining side peak value distance and the total length of the auxiliary transportation entry retaining side drilling hole obtained in the step S100, and the auxiliary transportation entry retaining side charge starting position Jie Suanchu; and combining and packing the second deflection angle, the total length of the drill hole on the auxiliary transportation entry retaining side and the medicine loading starting position on the auxiliary transportation entry retaining side to generate second-stage construction parameters.
9. The method of claim 1, wherein in step S400 and step S600, the performing of the drilling and slitting and the performing of the differential drilling each comprise: The intelligent directional drilling construction unit receives the construction parameter instruction, moves the drilling machine to a preset operation position, and automatically adjusts the elevation angle of the drilling boom according to the deflection angle parameter; Performing drilling operation until the hole depth reaches the total length of the drilled hole; and finishing the arrangement and hole sealing operation of the charge or high-pressure water injection device in the section from the charge starting position to the total length of the drill hole, and executing detonation or fracturing to block the hard rock stratum cantilever from transmitting stress to the solid coal side or the auxiliary transportation roadway retaining side.
10. A system for lateral roof double-section pre-slit pressure relief, characterized by being applied to a method for lateral roof double-section pre-slit pressure relief as claimed in any one of claims 1 to 9, comprising: The surrounding rock parameter detection unit is used for acquiring the loosening ring range; A stress dynamic monitoring array, wherein a deployment position is determined based on an initial pressure relief position calculated by the loosening range and is used for outputting real-time monitoring data; The data processing and decision center is respectively connected with the surrounding rock parameter detection unit and the stress dynamic monitoring array signal and is used for receiving the loosening ring range and the monitoring data, calculating the entity coal side peak value distance, the auxiliary transportation retaining roadway side peak value distance and the pressure relief horizon vertical height, and resolving and generating a first-stage construction parameter instruction and a second-stage construction parameter instruction; and the intelligent directional drilling construction unit is connected with the data processing and decision center and is used for receiving the first-stage construction parameter instruction and the second-stage construction parameter instruction and executing drilling and lancing operations.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the computer program, performs the steps of a method of lateral roof double-zone pre-lancing pressure relief as claimed in any one of claims 1 to 9.
12. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor performs the steps of a method of lateral roof double-zone pre-lancing pressure relief as claimed in any one of claims 1 to 9.

Description

Method and system for pressure relief of double-area pre-slitting of lateral top plate Technical Field The invention relates to the technical field of coal mine safety exploitation, in particular to a method and a system for pressure relief of double-area pre-slitting of a lateral roof. Background In the coal mining operation, the auxiliary transportation retaining roadway is influenced by the stoping of the adjacent working face and the repeated mining of the tunneling of the working face, and the surrounding rock of the temporary roadway is easy to deform or unstably caused by the superposition of lateral supporting pressure. In order to solve the problems, the prior art adopts hydraulic fracturing or deep hole blasting means to presplit the overlying hard top plate, cuts off the lateral cantilever structure of the goaf, and blocks the stress from being transmitted to the roadway. However, existing lateral roof pressure relief techniques mostly rely on formation horizon information or empirical formulas obtained from geological drilling to determine drilling parameters. The method only considers the static occurrence characteristics of the rock mass, ignores the rule that the supporting pressure field dynamically evolves along with the pushing of the working surface in the stoping process, and leads to inconsistent preset kerf positions and actual peak positions of stress concentration areas, so that a high-stress transmission path cannot be accurately cut off. In addition, the prior art adopts one-off static pressure relief operation, and lacks step-by-step regulation and control measures aiming at stress redistribution characteristics of different mining stages. In practice, there is a difference between the initial stress distribution caused by the stoping of the adjacent working face and the stress distribution during the entry retaining, and a single pressure relief structure cannot adapt to the migration of the stress peak under multiple stopes, so that the control effect of surrounding rock of the goaf roadway is limited. Disclosure of Invention Aiming at the problems that the existing lateral roof pressure relief technology is based on static geological parameter estimation, and the consideration of the full-period dynamic evolution rule of the mining support pressure is lacked, so that the matching degree of the pressure relief position and the stress concentration area is insufficient, and the control effect of the surrounding rock of the temporary roadway is affected, the invention provides a lateral roof double-area pre-lancing pressure relief method, a lateral roof double-area pre-lancing pressure relief system, electronic equipment and a storage medium. In order to achieve the above purpose, the invention is realized by the following technical scheme: the invention provides a method for pressure relief of a double-area pre-slitting of a lateral top plate, which comprises the following steps: measuring the loose circle range of the surrounding rock at the shallow part of the roadway by using a surrounding rock parameter detection unit, calculating an initial pressure relief position based on the loose circle range, and calibrating the boundary of the initial state of the surrounding rock of the roadway; Collecting monitoring data in real time through a stress dynamic monitoring array deployed in the section coal pillar, and extracting a physical coal side peak value distance representing stress concentration degree based on the monitoring data; Combining the geological parameters of the working face coal bed and the structural characteristics of the overlying strata, and preferentially determining the vertical height of the pressure relief horizon through numerical judgment; Taking the peak value distance of the solid coal side and the vertical height of the pressure relief horizon as input variables, calculating the construction parameters of the first stage, and preferentially implementing drilling and lancing on the solid coal roadway side of the adjacent working face to form a lancing structure of the first stage; in an observation window period after the joint cutting structure is formed in the first stage, tracking a stress redistribution state by using a stress dynamic monitoring array, and obtaining a peak value distance of an auxiliary transportation retaining roadway side; And (3) taking the peak value distance of the auxiliary transportation roadway retaining side and the vertical height of the pressure relief layer as input variables, calculating the construction parameters of the second stage, and implementing differential drilling on the auxiliary transportation roadway retaining side to complete the construction of the lateral roof double-area pressure relief system. Preferably, the initial pressure relief position is calculated based on the loosening range, specifically, a data processing and decision center receives the loosening range, a position calculation formula is calle