Method and system for pressure relief of double-area pre-cut joint of lateral top plate

Abstract

The invention relates to the technical field of coal mine safety mining, and discloses a lateral roof double-area pre-cut seam pressure relief method and system, and the method comprises the steps: measuring the range of a surrounding rock loosening circle to solve an initial pressure relief position; 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 the vertical height of the pressure relief horizon according to the geological parameters and the overlying strata structure; calculating first-stage parameters such as a drilling deflection angle based on the variables, and preferentially performing seam cutting on the entity coal side of the adjacent working face; the stress redistribution state is tracked in the observation window period, the corrected peak value distance of the auxiliary transportation entry retaining side is obtained, and according to the corrected peak value distance, second-stage parameters are solved, and differential joint cutting is completed. According to the method, a dynamic closed-loop feedback mechanism is constructed through a double-region and step-by-step time sequence strategy, it is ensured that the joint cutting position is accurately matched with the mining-induced stress extreme value region all the time, high stress transmission is effectively blocked, and the problem of surrounding rock instability induced by lateral bearing pressure superposition is solved.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety mining technology, specifically to a method and system for relieving pressure in the lateral roof with double-zone pre-cut joints. Background Technology

[0002] In coal mining operations, auxiliary haulage roadways are subject to repeated mining activities from adjacent working faces and the excavation of the current working face. The superimposed lateral support pressure makes the surrounding rock of the goaf roadway prone to deformation or instability. To solve these problems, existing technologies often employ hydraulic fracturing or deep-hole blasting to pre-fracture the hard overlying roof, cut off the lateral cantilever structure of the goaf, and prevent stress transmission to the roadway.

[0003] However, existing lateral roof decompression technologies mostly rely on stratum information obtained from geological boreholes or empirical formulas to determine borehole construction parameters. This approach only considers the static occurrence characteristics of the rock mass and ignores the dynamic evolution of the support pressure field as the working face advances during mining. As a result, the preset cutting positions often do not match the actual peak positions of stress concentration zones, making it impossible to accurately cut off the high stress transmission path.

[0004] Furthermore, existing technologies mostly employ one-time static stress relief operations, lacking step-by-step control measures tailored to the stress redistribution characteristics at different mining stages. In reality, the initial stress distribution caused by the mining of adjacent working faces differs from the stress distribution during the roadway retention period. A single stress relief structure cannot adapt to the migration of stress peaks under multiple mining operations, resulting in limitations in the control effect of the surrounding rock in the goaf roadway. Summary of the Invention

[0005] To address the problem that existing lateral roof decompression technologies rely heavily on static geological parameters for estimation and lack consideration of the dynamic evolution of mining support pressure throughout the entire cycle, resulting in insufficient matching between decompression locations and stress concentration zones, which in turn affects the control effect of surrounding rock in the goaf roadway, this invention provides a method, system, electronic equipment, and storage medium for lateral roof decompression with dual-zone pre-cut joints.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this invention provides a method for relieving pressure from a double-zone pre-cut seam in a lateral roof slab, comprising the following steps: The range of the loosened zone of the shallow surrounding rock in the roadway is determined by the surrounding rock parameter detection unit, and the initial pressure relief position is calculated based on the range of the loosened zone to calibrate the initial state boundary of the surrounding rock in the roadway. The stress dynamic monitoring array deployed inside the section coal pillar collects monitoring data in real time, and extracts the peak distance on the solid coal side, which characterizes the degree of stress concentration, based on the monitoring data. Based on the geological parameters of the coal seam and the characteristics of the overlying rock structure, the vertical height of the pressure relief layer is determined by numerical judgment. Using the peak distance on the solid coal side and the vertical height of the unloading layer as input variables, the first-stage construction parameters are calculated, and borehole cutting is preferentially implemented on the solid coal roadway side of the adjacent working face to form the first-stage cutting structure. During the observation window after the formation of the first-stage cut structure, the stress redistribution state is tracked using a stress dynamic monitoring array to obtain the peak distance on the side of the auxiliary transport roadway. Using the peak distance on the side of the auxiliary haulage roadway and the vertical height of the decompression layer as input variables, the construction parameters for the second stage were calculated, and differentiated drilling was carried out on the side of the auxiliary haulage roadway to complete the construction of the lateral roof dual-zone decompression system.

[0007] Preferably, the calculation of the initial decompression position based on the loosening zone range specifically involves: the data processing and decision center receiving the loosening zone range, combining it with a preset safety margin constant, calling the position calculation formula to perform calculations, outputting the planar projection distance of the initial decompression position, and setting this planar projection distance as the starting depth of the outermost sensor in the stress dynamic monitoring array.

[0008] Preferably, the real-time acquisition of monitoring data through a stress dynamic monitoring array deployed inside the coal pillar section includes: planning the installation depth of each borehole stress gauge in the stress dynamic monitoring array based on the planar projection distance of the initial decompression position and the geometric dimensions of the coal pillar section; sequentially burying borehole stress gauges along the depth direction according to the installation depth to construct a stress dynamic monitoring array with a coverage area extending from the boundary of the shallow loosening zone to the deep elastic core area of ​​the coal pillar; using the stress dynamic monitoring array to sense the vertical stress changes inside the coal body, generating monitoring data, identifying the local maximum points of the lateral support pressure distribution in the monitoring data, and extracting the coordinates corresponding to the local maximum points as the peak distance on the solid coal side.

[0009] Preferably, the step of preferentially determining the vertical height of the stress relief layer specifically involves: obtaining the average mining thickness of the coal seam in the working face, the fragmentation coefficient of the caving rock mass in the goaf, and the dip angle of the coal seam, and substituting them into the theoretical caving zone height calculation formula to calculate the theoretical caving zone height; obtaining the height of the hard roof layer, and comparing the height of the hard roof layer with the theoretical caving zone height; if the height of the hard roof layer is greater than the theoretical caving zone height, then the vertical height of the stress relief layer is determined to be equal to the height of the hard roof layer; if the height of the hard roof layer is less than or equal to the theoretical caving zone height, then the vertical height of the stress relief layer is determined to be equal to the theoretical caving zone height.

[0010] Preferably, the calculation of the first stage construction parameters includes: setting the roof shoulder angle of the adjacent working face solid coal roadway near the coal pillar as the origin of the local construction coordinate system; substituting the vertical height of the pressure relief layer and the peak distance of the solid coal side as input parameters into the first borehole deflection angle calculation formula to calculate the first deflection angle; and simultaneously substituting the vertical height of the pressure relief layer and the peak distance of the solid coal side as input parameters into the first borehole total length calculation formula to calculate the total length of the borehole on the solid coal side.

[0011] Preferably, the calculation of the first stage construction parameters further includes: calling the calculation formula for the first charge starting position to calculate the starting depressurization position, the peak distance on the solid coal side and the total length of the solid coal side borehole obtained in the previous steps, and calculating the starting position of the charge on the solid coal side; combining the first deflection angle, the total length of the solid coal side borehole and the starting position of the charge on the solid coal side into a package to generate the first stage construction parameters.

[0012] Preferably, the calculation of the second stage construction parameters includes: substituting the vertical height of the decompression layer and the peak distance on the side of the auxiliary haulage roadway as input parameters into the second borehole deflection angle calculation formula to calculate the second deflection angle; and substituting the vertical height of the decompression layer and the peak distance on the side of the auxiliary haulage roadway as input parameters into the second borehole total length calculation formula to calculate the total length of the borehole on the side of the auxiliary haulage roadway.

[0013] Preferably, the calculation of the second-stage construction parameters further includes: based on the principle of geometric similarity projection, using the calculation formula for the second charge starting position to calculate the starting depressurization position, the peak distance on the auxiliary haulage roadway side, and the total length of the borehole on the auxiliary haulage roadway side obtained in the previous steps, to calculate the charge starting position on the auxiliary haulage roadway side; combining the second deflection angle, the total length of the borehole on the auxiliary haulage roadway side, and the charge starting position on the auxiliary haulage roadway side into a package to generate the second-stage construction parameters.

[0014] Preferably, the specific operation of implementing borehole cutting and differentiated drilling is as follows: the intelligent directional drilling construction unit receives construction parameter instructions, moves the drilling rig to the predetermined working position, and automatically adjusts the drill arm elevation angle according to the deflection angle parameter; performs drilling operations until the hole depth reaches the total borehole length; completes the arrangement of charging or high-pressure water injection devices and hole sealing operations in the section from the charging start position to the total borehole length, and performs detonation or fracturing to block the transmission of stress from the hard rock cantilever to the solid coal side or the auxiliary haulage roadway side.

[0015] A second aspect of the present invention provides a lateral roof slab dual-zone pre-cut joint pressure relief system, comprising: The surrounding rock parameter detection unit is used to obtain the range of the loosened zone; The stress dynamic monitoring array is deployed based on the initial decompression position calculated from the loosening zone range, and is used to output real-time monitoring data; The data processing and decision-making center is connected to the surrounding rock parameter detection unit and the stress dynamic monitoring array signal respectively. It is used to receive the loosening zone range and monitoring data, calculate the peak distance on the solid coal side, the peak distance on the auxiliary haulage roadway side and the vertical height of the pressure relief layer, and solve and generate the first stage construction parameter command and the second stage construction parameter command. The intelligent directional drilling construction unit is connected to the data processing and decision-making center to receive the first-stage construction parameter instructions and the second-stage construction parameter instructions, and to perform drilling and cutting operations.

[0016] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of a method for relieving pressure in a dual-zone pre-cut seam of a lateral top plate as described in the first aspect above.

[0017] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of a method for relieving pressure in a dual-zone pre-cut seam of a lateral top plate as described in the first aspect above.

[0018] This invention provides a method, system, electronic device, and storage medium for pressure relief via a dual-zone pre-cut seam in a lateral roof slab. It offers the following advantages: 1. This invention transforms the traditional empirical stress relief method based on static geological parameters into a quantitative operation based on real-time data by deploying a dynamic stress monitoring array. The peak distances of the actual coal side and the auxiliary haulage roadway side extracted from the monitoring data directly guide the calculation of borehole parameters, ensuring that the cutting position always remains consistent with the extreme value area of ​​the lateral support pressure. This solves the problem of deviation between the preset stress relief position and the actual strong stress disturbance area, and improves the adaptability and control accuracy of stress relief measures to the surrounding rock stress environment.

[0019] 2. This invention establishes a time-series construction system that includes priority cutting on the solid coal side in the first stage and differentiated cutting on the auxiliary haulage roadway side in the second stage. This system uses the observation window after cutting to track the stress redistribution state and obtain the stress peak position after evolution correction. It overcomes the limitation that single-time-point operation cannot adapt to the stress movement throughout the entire mining cycle and ensures that the dual-zone pressure relief structure can effectively play the role of blocking the transmission of high stress in different mining stages.

[0020] 3. This invention integrates loosened zone range detection and hard roof layer determination technologies to construct a clear borehole spatial geometric model. By defining the initial decompression position to avoid shallow surrounding rock failure zones and optimizing the decompression layer based on the theoretical caving zone height, a spatial cut structure adaptable to roadway and geological conditions is formed, cutting off the load transfer path from the hard roof cantilever to the free-running roadway and improving the stress state of the surrounding rock in the free-running roadway. Attached Figure Description

[0021] Figure 1 This is a structural block diagram of a dual-zone pre-cut groove pressure relief system for a lateral top plate according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a method for relieving pressure in a dual-zone pre-cut seam on a lateral top plate according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0022] Among them, 110 is the surrounding rock parameter detection unit; 120 is the stress dynamic monitoring array; 130 is the data processing and decision-making center; and 140 is the intelligent directional drilling construction unit. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] See attached document Figure 1 The present invention provides a lateral roof double-zone pre-cut joint pressure relief system, which includes: a surrounding rock parameter detection unit 110, a stress dynamic monitoring array 120, a data processing and decision center 130, and an intelligent directional drilling construction unit 140.

[0025] The surrounding rock parameter detection unit 110 is used to perform physical detection on the shallow surrounding rock of the roadway to obtain the range of the loosened zone of the surrounding rock. This value is used to determine the geometric boundaries and safety margins for subsequent system deployment. The surrounding rock parameter detection unit 110 employs geophysical exploration equipment such as ground-penetrating radar or borehole sighting instruments.

[0026] The stress dynamic monitoring array 120 is deployed inside the coal pillar of a section to acquire real-time data on the lateral support pressure distribution inside the coal pillar. The stress dynamic monitoring array 120 consists of several borehole stress gauges that are buried sequentially along the depth direction at preset intervals, and its coverage extends from the boundary of the shallow loose zone to the deep elastic core region of the coal pillar.

[0027] The data processing and decision-making center 130 is connected to the surrounding rock parameter detection unit 110 and the stress dynamic monitoring array 120 via signals. The data processing and decision-making center 130 receives monitoring data, calculates the characteristic parameters of the stress peak location, and, based on its built-in spatial structure stability determination logic, calculates the pressure relief drilling construction parameters for the first and second stages. These parameters include the borehole length, the initial pressure relief position, and the deflection angle.

[0028] The intelligent directional drilling construction unit 140 is connected to the data processing and decision-making center 130 to receive construction parameter instructions and execute drilling and slotting operations. The intelligent directional drilling construction unit 140 has a drill arm angle adjustment function, which can adjust the deflection angle of the borehole axis relative to the vertical direction according to the instructions to implement vertical slotting or trapezoidal deflection slotting.

[0029] See attached document Figure 2 This invention provides a method for stress relief of a dual-zone sequential pre-cut joint in a lateral roof slab based on dynamic stress response, comprising the following steps: Step S100: Use the surrounding rock parameter detection unit to determine the range of the loosening zone of the shallow surrounding rock in the roadway, and determine the starting pressure relief position and the installation depth of the stress monitoring array based on the range of the loosening zone, thus completing the boundary calibration of the initial state of the surrounding rock in the roadway. Step S200: Real-time acquisition of support pressure data during the mining process of adjacent working faces using a stress monitoring array; extraction of peak distance on the solid coal side and peak distance on the auxiliary haulage roadway side, which characterize the degree of stress concentration. Step S300: Calculate the theoretical caving zone height by combining the geological parameters of the coal seam and the characteristics of the overlying structure of the working face, and compare this height with the hard roof strata to determine the vertical height of the pressure relief strata. Step S400: Based on the peak distance of the physical coal side, the peak distance of the auxiliary haulage roadway side, and the vertical height of the stress relief layer, a two-way virtual crack penetration criterion is constructed. By comparing the geometric relationship between the stress peak span and the stress relief height, deflection angle parameters for subsequent construction are generated. Step S500: Calculate the first-stage construction parameters based on the peak distance of the solid coal side and the vertical height of the pressure relief layer, and prioritize drilling and cutting on the solid coal roadway side of the adjacent working face to form the first-stage cutting structure. Step S600: During the observation window period after the formation of the first stage cut structure, the stress redistribution state is tracked using a stress monitoring array to obtain the peak distance on the side of the auxiliary haulage roadway after time-series evolution correction. In step S700, the second-stage construction parameters are calculated using the conditional branch algorithm based on the deflection angle parameters and the corrected peak distance on the side of the auxiliary haulage roadway. Differential drilling is then carried out on the side of the auxiliary haulage roadway to complete the construction of the lateral roof dual-zone pressure relief system.

[0030] The technical implementation details of each of the above steps will be explained in detail below, combining specific calculation formulas and logical judgment conditions.

[0031] The present invention completes the quantitative calibration of the initial state of the auxiliary haulage roadway and the section coal pillar through step S100. The specific implementation process is detailed as follows: First, in step S110, the surrounding rock parameter detection unit 110 performs physical detection on the shallow surrounding rock of the auxiliary haulage roadway. Specifically, in the preparatory stage before the auxiliary haulage roadway is severely affected by the dynamic pressure of the working face's mining, the surrounding rock parameter detection unit 110 controls a ground-penetrating radar detector or borehole inspection instrument to conduct vertical detection on the roadway sides and roof. During the detection process, the boundary depth between the densely developed rock fracture zone and the intact rock strata is identified, and this depth is marked as the loosened zone range, denoted as... (Unit: meters). The use of geophysical equipment to obtain loosening maps is a well-known technique in this field and will not be elaborated upon further.

[0032] In step S120, the data processing and decision-making center 130 receives the loosening zone range. Based on this value, the initial decompression position and the initial installation depth for stress monitoring are calculated. To ensure the quality of subsequent decompression drilling and to avoid damage to the anchorage zone of the anchor bolts (cables), physical safety boundaries need to be set. The Data Processing and Decision Center 130 uses the following location calculation formula to determine the planar projection distance of the initial decompression position. : ; In the formula: The distance is the planar projection distance of the initial depressurization position, and also serves as the starting depth for the outermost sensor in the subsequent installation of the stress monitoring array; the unit is meters. This indicates the measured range of the loosened zone of the surrounding rock in the tunnel, in meters. Represents logarithmic values Perform floor operations to adapt to the drilling practice of connecting drill pipes in whole meters during drilling operations; This represents a preset safety margin constant, in meters. In this embodiment, it is taken as... It is used to ensure that the detonation or decompression point can cross the shallow fracture zone and effectively penetrate the deep elastic core zone (i.e., the actual charge position is deeper than the loosening zone boundary), and to prevent accidental damage to the shallow support system during operations.

[0033] In step S130, based on the initial depressurization position Based on the geometry of the coal pillar section, a dynamic stress monitoring array 120 is constructed inside the coal pillar section. First, the width of the coal pillar section is determined. (Unit: meters). To prevent water accumulation and harmful gases from adjacent goaf areas from damaging the monitoring equipment, an effective installation cutoff boundary for the monitoring array is established.

[0034] During actual construction, multiple monitoring boreholes were drilled in the sidewall of the auxiliary haulage roadway, and several borehole stress gauges contained in the stress dynamic monitoring array 120 were sequentially pushed to a preset depth. The installation depth of each borehole stress gauge... Generated by the Data Processing and Decision Center 130 according to the following sequence rules: ; And it satisfies the maximum depth constraint condition: ; In the formula: Indicates the first The specific installation depth of each borehole stress gauge is in meters. The initial installation depth determined by the preceding steps; This is the serial number sequence of the borehole stress gauges, with values ​​being positive integers ( ); In this embodiment, the sensor installation spacing is set as follows: This high-resolution spacing is used to accurately capture the spatial location of stress peaks; This indicates the overall width of the coal pillar section, in meters.

[0035] After installation, the stress dynamic monitoring array 120 is connected to the data processing and decision-making center 130 via signal transmission cable or wireless communication module, forming a complete monitoring chain extending from the shallow elastic zone on the side of the auxiliary haulage roadway to the deep coal pillar, providing a data basis for the subsequent accurate extraction of the peak distance on the physical coal side and the peak distance on the side of the auxiliary haulage roadway.

[0036] In steps S200 to S300, the present invention utilizes the data processing and decision-making center 130 to perform feature analysis on the collected dynamic stress data and, in conjunction with geological conditions, determines the spatial geometric target point for pressure relief construction. The specific implementation method is detailed below: In step S210, the stress dynamic monitoring array 120 continuously collects data on the evolution of support pressure during the mining process of adjacent working faces. As the mining operation of adjacent working faces progresses, the coal pillar in the section is affected by mining activity, and its internal stress field is redistributed. The stress gauges in each borehole arranged along the depth direction in the stress dynamic monitoring array 120 sense the vertical stress changes inside the coal body in real time and transmit the generated digital signal stream to the data processing and decision center 130. The data processing and decision center 130 constructs a real-time curve model reflecting the lateral support pressure distribution of the coal pillar in the section, with the monitoring depth as the abscissa and the stress intensity as the ordinate.

[0037] In step S220, the data processing and decision center 130 performs extreme value characteristic analysis on the lateral support pressure distribution. Specifically, the system identifies two significant local maxima in the curve, labeled as "peak point 1" corresponding to the high stress concentration zone on the solid coal side and "peak point 2" corresponding to the high stress concentration zone on the auxiliary haulage roadway side. Based on the positions of these two peak points in the stress monitoring array, the data processing and decision center 130 extracts the following two key geometric control parameters: Firstly, the peak distance on the solid coal side. (Unit: meters): Defined as the vertical distance of peak point 1 on the horizontal plane relative to the sidewall of the adjacent working face coal roadway. This parameter Used to define the side cuts of the subsequent first-stage solid coal.

[0038] Secondly, the peak distance on the side of the auxiliary haulage roadway. (Unit: meters): Defined as the vertical distance of peak point 2 on the horizontal plane relative to the sidewall of the auxiliary haulage roadway in this working face. This parameter Used to define the horizontal extension boundary of the side cut joint in the subsequent second-stage auxiliary haulage roadway.

[0039] In step S310, the data processing and decision-making center 130 retrieves pre-stored geological parameters of the working face coal seam and calculates the theoretical caving zone height. To ensure that the stress relief cut can effectively block the transmission path of roof stress, the cut height must cover the caving zone and extend to the critical strata. Based on the built-in rock strata control calculation model, the data processing and decision-making center 130 calculates the theoretical caving zone height using the following formula. : ; In the formula: This represents the vertical height of the landslide zone calculated theoretically, in meters. This indicates the average mining thickness of the coal seam at the working face, in meters. This represents the fragmentation coefficient of the collapsed rock mass in the goaf. This dimensionless constant reflects the volume expansion characteristics of the rock after it is broken. This indicates the dip angle of the coal seam, expressed in degrees.

[0040] In step S320, the data processing and decision-making center 130 combines the geological borehole columnar section data to determine the final vertical height of the stress relief layer. The system first extracts the layer height information of the hard top plate from the geological database, denoted as... (Unit: meters). Subsequently, the Data Processing and Decision Center 130 executes the vertical height optimization logic to optimize the height of the rigid top slab. With the theoretical collapse zone height Comparisons were conducted to determine the vertical height of the decompression layer to guide borehole construction. : when This indicates that the location of the hard roof is higher than the theoretically calculated upper limit of the caving zone. To ensure that the pressure relief borehole can cut through this critical hard rock layer and prevent high-level overhang from causing far-field stress concentration, the Data Processing and Decision Center 130 determined... .

[0041] when At this point, it indicates that the hard roof is located within the theoretical collapse zone. To fully utilize the collapsed gangue to fill the goaf and support the overlying strata, the Data Processing and Decision Center 130 determined... .

[0042] Based on the above logic, the Data Processing and Decision Center 130 completed the processing of three core spatial geometric parameters. , and The quantitative calibration of these three parameters will serve as input variables for the subsequent borehole trajectory planning of the intelligent directional drilling construction unit 140.

[0043] In steps S400 to S500, the data processing and decision-making center 130 performs spatial geometric calculations of the borehole trajectory based on the feature parameters obtained in the preceding steps, and controls the intelligent directional drilling construction unit 140 to perform precise pre-splitting on the adjacent working face side (solid coal side). Detailed implementation methods are as follows: In step S400, the data processing and decision-making center 130, based on the determined vertical height of the depressurization layer... Peak distance from solid coal side The first-stage spatial geometric slit model was constructed. This model was used to plan the drilling path connecting the shoulder angle of the solid coal roadway of adjacent working faces with the key layer of the roof in the high stress concentration zone on the solid coal side.

[0044] Specifically, in order to match parameters Based on the geometric definition, the Data Processing and Decision Center 130 establishes a local construction coordinate system with the roof shoulder angle near the coal pillar side of the adjacent working face coal roadway as the origin. The system maps the stress concentration area where "peak point 1" identified in the previous steps is located to a spatial target point in this coordinate system. Connect the origin to the target point. The straight line vector is the theoretical axis trajectory of the first-stage solid coal side pressure relief borehole.

[0045] In step S500, the data processing and decision center 130 calculates the static pressure relief construction parameters on the actual coal side based on the theoretical axis trajectory and generates drilling rig control commands. To achieve precise truncation of the hard roof and avoid the shallow fractured zone of the roadway, the system calculates the following three key parameters: Step S510: Calculate the deflection angle of the borehole on the solid coal side.

[0046] The Data Processing and Decision Center 130 uses inverse trigonometric functions to calculate the elevation angle of the borehole axis relative to the horizontal plane, i.e., the first deflection angle. : ; In the formula: The first deflection angle of the pressure relief borehole on the solid coal side is expressed in degrees (°). This parameter is used to control the attitude of the drill arm of the intelligent directional drilling construction unit 140. The vertical height of the depressurization layer is in meters. This represents the peak distance on the coal side, in meters.

[0047] Step S520: Calculate the total length of the borehole on the solid coal side and the starting position of the charge.

[0048] Data Processing and Decision Center 130 uses the Pythagorean theorem to calculate the total length of boreholes on the coal side of solid coal. : ; Meanwhile, in order to determine the sealing depth and avoid damage to the support system within the shallow loose circle of the roadway by blasting or fracturing, the data processing and decision-making center 130, based on the principle of geometrically similar triangles, projects the distance of the initial pressure relief plane determined in step S120. Converted to the actual hole depth along the borehole axis, i.e., the starting position of the charge on the solid coal side. : ; In the formula: This represents the straight-line length from the opening point at the shoulder of the tunnel to the bottom of the opening, in meters. This indicates the depth at which fracturing operations begin inside the borehole, in meters (i.e., 0 to 100 meters). (For sealing section) The projected distance of the initial depressurization position is equal to the value of the distance. (in This refers to the loosening zone. (for safety constants) and The meaning is the same as before.

[0049] In step S530, the data processing and decision center 130 will include The construction instructions are sent to the intelligent directional drilling construction unit 140.

[0050] After receiving the instruction, the intelligent directional drilling construction unit 140 deploys the drilling rig in the adjacent working face's solid coal roadway and automatically adjusts the borehole elevation angle to... Drilling begins at the shoulder angle near the coal pillar and continues until the drilling depth reaches [a certain level]. Subsequently, based on Parameters, at hole depth to Within the designated section, explosives are loaded or high-pressure water is injected, and the borehole is sealed. After detonation or fracturing, an artificial crack is formed in the roof of the solid coal side, which precisely severs the hard rock cantilever that transmits stress to the solid coal side. The specific operational procedures for drilling, sealing, and detonation are implemented using conventional techniques in this field.

[0051] In steps S600 to S700, after completing the first stage of depressurization on the physical coal side, the present invention utilizes the data processing and decision-making center 130 for asynchronous observation and parameter correction, and controls the intelligent directional drilling construction unit 140 to execute differentiated cutting on the auxiliary haulage roadway side. Detailed implementation methods are as follows: After completing the first stage of construction on the solid coal side in the preceding steps, the process proceeds to step S600. Considering that the stress field above the coal pillar will shift and redistribute after the roof of the solid coal side is cut off, immediately implementing the second stage of construction might lead to target point deviation or dynamic superposition. Therefore, the data processing and decision center 130 sets an observation window period after pressure relief. (For example, 24 to 48 hours), during which no drilling operations are carried out. The stress dynamic monitoring array 120 continuously collects vertical stress data inside the coal pillar and feeds the data back to the data processing and decision-making center 130 in real time. The data processing and decision-making center 130 monitors the stress evolution process on the auxiliary haulage roadway side (the side closest to the working face), and when the observation time reaches... When the stress distribution tends to stabilize, the system captures the new stress peak location and marks the vertical distance of this peak point relative to the sidewall of the auxiliary haulage roadway on the horizontal plane as the auxiliary haulage roadway side peak distance. .

[0052] In step S700, the data processing and decision center 130 calculates the drilling parameters applicable to the auxiliary haulage roadway side based on the updated geological geometry information. This is because the peak distance on the auxiliary haulage roadway side... Typically, the distance from the peak value of the solid coal side Not equal (i.e.) To achieve precise pressure relief, the system needs to recalculate the following geometric parameters: Step S710: Calculate the deflection angle of the side borehole in the auxiliary haulage roadway.

[0053] Data Processing and Decision Center 130 based on the vertical height of the pressure relief layer Peak distance between the auxiliary haulage roadway and the side Calculate the second deflection angle using inverse trigonometric functions. : ; In the formula: This parameter represents the angle between the axis of the pressure relief borehole on the auxiliary haulage roadway side and the horizontal plane, in degrees (°). This parameter is a control command sent by the data processing and decision-making center 130 to the intelligent directional drilling construction unit 140 to adjust the drilling rig arm elevation angle. The vertical height of the pressure relief layer determined in step S300, in meters; The peak distance on the auxiliary haulage roadway side determined in this step is in meters.

[0054] Step S720: Calculate the total length of the side borehole in the auxiliary haulage roadway and the starting position of the explosive charge.

[0055] The Data Processing and Decision Center 130 used the Pythagorean theorem to calculate the total length of boreholes on the side of the auxiliary haulage roadway. : ; Meanwhile, to ensure that the second-stage decompression operation does not damage the stability of the shallow surrounding rock in the roadway, the Data Processing and Decision Center 130 again applied the principle of geometric similarity projection to project a uniform initial decompression plane distance. Mapping to the borehole path of the second stage, calculate the starting position of the explosive charge on the auxiliary haulage roadway side. : ; In the formula: This indicates the straight-line length from the opening point at the shoulder corner of the auxiliary haulage roadway to the bottom of the opening, in meters; This indicates the depth at which charging or fracturing operations begin inside the borehole on the side of the auxiliary haulage roadway, in meters. The physical safety boundary determined based on the results of the surrounding rock loosening zone detection (i.e., the boundary established in the previous steps) ); and The meaning is the same as before.

[0056] In step S730, the data processing and decision center 130 will include The construction control parameters are sent to the intelligent directional drilling construction unit 140.

[0057] After receiving the parameters, the intelligent directional drilling construction unit 140 moves the drilling rig to the predetermined working position on the side of the auxiliary haulage roadway and automatically adjusts the drill arm elevation angle to... And carry out drilling operations until the hole depth reaches Subsequently, based on Parameters, at hole depth to Within the designated section, the loading of explosives or the arrangement of high-pressure water injection devices and the sealing of holes are completed, and the second stage of detonation or fracturing is finally carried out.

[0058] Through the above steps, this system constructs a "non-synchronous, asymmetric" dual-zone pressure relief structure: it staggers the dynamic disturbances on both sides in time and adapts them spatially. and Two different stress peak locations enabled precise cutting of the hard roof above the coal pillar in the section, eliminating the stress concentration hazard caused by lateral overhang.

[0059] By utilizing the Data Processing and Decision Center 130 and combining it with specific engineering geological variables, the differentiated construction parameters for dual-zone pressure relief were calculated and verified. The detailed implementation method is described below: Determine the basic geological parameters for project implementation. Taking a high-extraction working face in a western mining area as an example, the average mining thickness of the coal seam in the working face... Coal seam dip angle (Near-horizontal coal seam), coefficient of caving and swelling of rock mass in goaf area An empirical value of 1.3 was selected. Geological data indicates the height of the main hard limestone roof above the coal seam. At this time, the surrounding rock parameter detection unit 110 conducts physical detection on the shallow surrounding rock of the roadway, and measures the range of the loosened zone in the auxiliary haulage roadway. The Data Processing and Decision Center 130 sets the sealing safety constant. .

[0060] The data processing and decision-making center 130 calculates the vertical and horizontal stress relief boundaries. First, the data processing and decision-making center 130 calculates the theoretical caving zone based on the preceding formulas; : ; Next, the Data Processing and Decision Center 130 will determine the actual hard top slab layer. ( (meters) and ( Numerical determination is performed. Because... This indicates that the rigid top slab is within the caving zone. To ensure that the critical layer can be cut off and sufficient space for calving is provided, the system determines the vertical height of the decompression layer. .

[0061] Meanwhile, the Data Processing and Decision Center 130 based on Calculate the planar projection distance of the initial depressurization position. : ; Secondly, the stress dynamic monitoring array 120 monitors and feeds back data in real time, and the data processing and decision-making center 130 extracts the stress peak characteristics. Through monitoring and analysis, the horizontal distance between the peak point of the high stress concentration area on the solid coal side and the sidewall of the roadway on the solid coal side is determined. The value was determined to be 10.0 meters. This was achieved after the first stage of depressurization was completed and the observation window period was passed. Subsequently, the system detected that the stress peak on the side of the auxiliary haulage roadway had stabilized, and its horizontal distance relative to the sidewall of the auxiliary haulage roadway was stable. It has been determined to be 8.0 meters.

[0062] Subsequently, the Data Processing and Decision Center 130 calculated the construction parameters for the first stage of the physical coal side. Using the aforementioned deflection angle formula, the first deflection angle was calculated. : ; Using the aforementioned length formula, calculate the total length of the borehole on the solid coal side. and the starting position of the charge : ; ; Based on the above calculation results, the data processing and decision-making center 130 sends the first-stage control command to the intelligent directional drilling construction unit 140: adjust the drill arm elevation angle to... Drilling depth and in the depth of the hole to Blasting or fracturing will be carried out within the designated section.

[0063] Then, the Data Processing and Decision Center 130 calculates the construction parameters for the second phase of the auxiliary haulage roadway.

[0064] Calculate the second deflection angle using the aforementioned deflection angle formula. : ; Using the aforementioned length formula, calculate the total length of the side boreholes in the auxiliary haulage roadway. and the starting position of the charge : ; ; Based on the above calculation results, the data processing and decision-making center 130 sends a second-stage control command to the intelligent directional drilling construction unit 140: adjust the drill arm elevation angle to... Drilling depth and in the depth of the hole to Blasting or fracturing is carried out within a 1-meter section.

[0065] In summary, this embodiment, through data processing and calculations by the decision center 130, yielded two asymmetric borehole trajectories. Among them, the deflection angle on the auxiliary haulage roadway side... ( (Greater than the solid coal side) ( ), and the initial depth of the charge. ( (greater than) ( This differentiated parameter setting not only precisely matches the two sides of the coal pillar in the section, but also... The asymmetric stress distribution characteristics of the invention are demonstrated. More importantly, by increasing the sealing depth on the side of the auxiliary haulage roadway, the disturbance of the shallow surrounding rock support system of the roadway to the pressure relief operation is effectively avoided, verifying the adaptability and safety of the invention under complex geological conditions.

[0066] Further, refer to the appendix Figure 3 The electronic device can be configured as the data processing and decision center 130 in the foregoing embodiments to perform the calculation task of pressure relief of the double-zone pre-cut joint of the lateral top plate.

[0067] like Figure 3 As shown, the electronic device 900 includes a processor 910, a memory 920, a communication interface 930, and a bus 940. The processor 910, memory 920, and communication interface 930 communicate with each other via the bus 940.

[0068] The memory 920 stores a computer program, which includes program instructions. The processor 910 is configured to invoke the program instructions to perform the steps in the foregoing method embodiments. Specifically, when the processor 910 executes the computer program, it performs the following core logical operations: Boundary and location calculation: Processor 910 receives the range S of the loosened zone of the surrounding rock and calculates it according to the formula... Automatically calculates the initial depressurization position and the installation depth of the stress monitoring array; High-precision selection: The processor 910 determines the optimal parameters based on the input coal seam thickness M and the coefficient of fracture expansion. and coal seam dip angle Using the formula The theoretical caving zone height is calculated and logically compared with the rigid top layer H to output the vertical height of the optimal stress relief layer. ; First-stage parameter calculation: Based on the peak distance J of the physical coal side obtained from real-time monitoring, the processor 910 uses the formula... as well as Calculate the borehole deflection angle and total length for the first stage; Second-stage parameter calculation: Based on the peak distance F obtained from asynchronous timing monitoring on the auxiliary transport tunnel side, the processor 910 uses the formula... as well as The differentiated borehole parameters for the second stage are calculated.

[0069] The processor 910 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0070] Memory 920 may include read-only memory and random access memory, and provides instructions and data to processor 910. A portion of memory 920 may also include non-volatile random access memory. For example, memory 920 may also store device type information.

[0071] The communication interface 930 is used to transmit data with the surrounding rock parameter detection unit 110, the stress dynamic monitoring array 120 and the intelligent directional drilling construction unit 140, receive sensor signals and send drilling rig control commands.

[0072] Furthermore, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it implements the method for relieving pressure from the double-zone pre-cut seam in the lateral top plate as described in the foregoing embodiments.

[0073] The computer-readable storage medium can be an internal storage unit of the electronic device in any of the foregoing embodiments, such as a hard disk or memory of the electronic device. The computer-readable storage medium can also be an external storage device of the electronic device, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device. Furthermore, the computer-readable storage medium can include both internal and external storage units of the electronic device. The computer-readable storage medium is used to store computer programs and other programs and data required by the electronic device. The computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

Claims

1. A method for relieving pressure in a double-zone pre-cut joint on a lateral roof slab, characterized in that, Includes the following steps: S100. Utilize the surrounding rock parameter detection unit to determine the range of the loosened zone of the shallow surrounding rock in the roadway, and calculate the initial pressure relief position based on the range of the loosened zone to complete the boundary calibration of the initial state of the surrounding rock in the roadway. S200. Real-time monitoring data is collected by a stress dynamic monitoring array deployed inside the section coal pillar, and the peak distance on the solid coal side, which characterizes the degree of stress concentration, is extracted based on the monitoring data. S300. Combining the geological parameters of the coal seam and the characteristics of the overlying rock structure, the vertical height of the pressure relief layer is determined by numerical judgment to select the best option. S400. Using the peak distance on the solid coal side and the vertical height of the pressure relief layer as input variables, calculate the first stage construction parameters, and preferentially implement drilling and cutting on the solid coal roadway side of the adjacent working face to form the first stage cutting structure. S500. During the observation window period after the formation of the first stage cut structure, the stress redistribution state is tracked using the stress dynamic monitoring array to obtain the peak distance on the auxiliary haulage roadway side after time-series evolution correction. S600. Using the peak distance on the side of the auxiliary haulage roadway and the vertical height of the decompression layer as input variables, calculate the construction parameters for the second stage, and carry out differentiated drilling on the side of the auxiliary haulage roadway to complete the construction of the lateral roof dual-zone decompression system.

2. The method for relieving pressure in a double-zone pre-cut joint of a lateral top plate according to claim 1, characterized in that, In step S100, calculating the initial pressure relief position based on the loosened ring range specifically includes: The data processing and decision-making center receives the loosening range and sets a preset safety margin constant; The location calculation formula is called to calculate the range of the loosening ring and the safety margin constant, output the planar projection distance of the initial pressure relief position, and set the planar projection distance as the starting depth of the outermost sensor in the stress dynamic monitoring array.

3. The method for relieving pressure in a double-zone pre-cut seam of a lateral top plate according to claim 2, characterized in that, In step S200, the real-time acquisition of monitoring data through a stress dynamic monitoring array deployed inside the coal pillar of the section specifically includes: Based on the planar projection distance and the geometric dimensions of the coal pillar section, the installation depth of each borehole stress gauge in the stress dynamic monitoring array is planned; According to the installation depth, borehole stress gauges are sequentially buried along the depth direction to construct the stress dynamic monitoring array whose coverage extends from the boundary of the shallow loosening zone to the deep elastic core zone of the coal pillar. The stress dynamic monitoring array is used to sense the vertical stress changes inside the coal body, generate the monitoring data, identify the local maximum points of the lateral support pressure distribution in the monitoring data, and extract the coordinates corresponding to the local maximum points as the peak distance of the coal side.

4. The method for relieving pressure in a double-zone pre-cut joint of a lateral top plate according to claim 3, characterized in that, In step S300, the step of preferentially determining the vertical height of the depressurization layer specifically includes: The average mining thickness of the coal seam in the working face, the fragmentation coefficient of the caving rock mass in the goaf, and the dip angle of the coal seam are obtained and substituted into the theoretical caving zone height calculation formula to calculate the theoretical caving zone height. Obtain the height of the solid roof layer and compare the height of the solid roof layer with the theoretical collapse zone height. If the height of the rigid top layer is greater than the theoretical collapse zone height, then the vertical height of the pressure relief layer is determined to be equal to the height of the rigid top layer. If the height of the rigid top layer is less than or equal to the theoretical caving zone height, then the vertical height of the decompression layer is determined to be equal to the theoretical caving zone height.

5. The method for relieving pressure in a double-zone pre-cut joint of a lateral roof slab according to claim 1, characterized in that, In step S400, the calculation of the first-stage construction parameters specifically includes: The roof shoulder angle of the adjacent working face solid coal roadway near the coal pillar is set as the origin of the local construction coordinate system; The vertical height of the decompression layer and the peak distance of the solid coal side are used as input parameters and substituted into the first borehole deflection angle calculation formula to calculate the first deflection angle. The vertical height of the decompression layer and the peak distance on the solid coal side are used as input parameters and substituted into the formula for calculating the total length of the first borehole to obtain the total length of the borehole on the solid coal side.

6. The method for relieving pressure in a double-zone pre-cut joint of a lateral top plate according to claim 5, characterized in that, In step S400, the calculation of the first-stage construction parameters further includes: The formula for calculating the initial charge starting position is called to calculate the initial depressurization position, the peak distance on the solid coal side, and the total length of the borehole on the solid coal side obtained in step S100, and the initial charge starting position on the solid coal side is calculated. The first deflection angle, the total length of the borehole on the solid coal side, and the starting position of the explosive charge on the solid coal side are combined and packaged to generate the first stage construction parameters.

7. The method for relieving pressure in a double-zone pre-cut seam of a lateral top plate according to claim 1, characterized in that, In step S600, the calculation of the second-stage construction parameters specifically includes: The vertical height of the decompression layer and the peak distance of the auxiliary haulage roadway side are used as input parameters and substituted into the second borehole deflection angle calculation formula to calculate the second deflection angle. The vertical height of the decompression layer and the peak distance on the side of the auxiliary haulage roadway are used as input parameters and substituted into the formula for calculating the total length of the second borehole to obtain the total length of the borehole on the side of the auxiliary haulage roadway.

8. The method for relieving pressure in a double-zone pre-cut seam of a lateral top plate according to claim 7, characterized in that, In step S600, the calculation of the second-stage construction parameters further includes: Based on the principle of geometric similarity projection, the calculation formula for the second charge start position is called to calculate the starting depressurization position, the peak distance on the auxiliary haulage roadway side and the total length of the borehole on the auxiliary haulage roadway side obtained in step S100, and the charge start position on the auxiliary haulage roadway side is calculated. The second deflection angle, the total length of the borehole on the auxiliary haulage roadway side, and the starting position of the explosive charge on the auxiliary haulage roadway side are combined and packaged to generate the second stage construction parameters.

9. A method for relieving pressure in a double-zone pre-cut seam of a lateral top plate according to claim 1, characterized in that, In steps S400 and S600, the implementation of drilling slits and differentiated drilling specifically includes: The intelligent directional drilling construction unit receives construction parameter instructions, moves the drilling rig to the predetermined working position, and automatically adjusts the drill arm elevation angle according to the deflection angle parameters; Drilling operations continue until the hole depth reaches the total borehole length; Within the section from the starting position of the charge to the total length of the borehole, the charging or high-pressure water injection device arrangement and borehole sealing operations are completed, and the blasting or fracturing is carried out to block the transmission of stress from the hard rock cantilever to the solid coal side or the auxiliary haulage roadway side.

10. A system for relieving pressure in a lateral roof slab with pre-cut joints in two zones, characterized in that, The method for relieving pressure in a dual-zone pre-cut joint of a lateral roof slab as described in any one of claims 1-9 includes: The surrounding rock parameter detection unit is used to obtain the range of the loosened zone; The stress dynamic monitoring array is deployed based on the initial depressurization position calculated from the loosening zone range, and is used to output real-time monitoring data; The data processing and decision-making center is connected to the surrounding rock parameter detection unit and the stress dynamic monitoring array signal respectively. It is used to receive the loosening zone range and the monitoring data, calculate the peak distance on the solid coal side, the peak distance on the auxiliary haulage roadway side and the vertical height of the pressure relief layer, and solve and generate the first stage construction parameter command and the second stage construction parameter command. The intelligent directional drilling construction unit is connected to the data processing and decision-making center and is used to receive the first-stage construction parameter instructions and the second-stage construction parameter instructions, and to perform drilling and cutting operations.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of a method for relieving pressure in a dual-zone pre-cut seam of a lateral top plate as described in any one of claims 1 to 9.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a method for relieving pressure in a dual-zone pre-cut seam of a lateral top plate as described in any one of claims 1 to 9.

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