471 results about "Coal pillar" patented technology

The invention discloses a coal pillar damage dynamic monitoring system and method based on multi-physics coupling and distributed optical fiber sensing, and relates to the technical field of dynamic monitoring. Multi-physics coupling data of a coal pillar is collected in real time through a distributed optical fiber sensing network, and a health index of a coal pillar structure is obtained based on a trained time sequence multi-scale mapping model; the damage evolution rate of the coal pillar is calculated, and if the damage evolution rate is lower than a preset first threshold value, the sampling frequency of the distributed optical fiber sensing network is adjusted, and the data acquisition density of the distributed optical fiber sensing network is reduced; increasing the sampling frequency of the distributed optical fiber sensing network and constructing a trend prediction model to generate evolution prediction of the coal pillar damage if the coal pillar damage is not lower than the preset first threshold value but lower than the preset second threshold value; and if not, switching the distributed optical fiber sensing network to a high-frequency sampling mode, and generating the evolution acceleration of the coal pillar damage. The optimal configuration of the monitoring resources and the dynamic adjustment of the monitoring intensity are realized.

The invention discloses a mining section coal pillar goaf side concrete wall reinforcing method, and relates to the field of coal mining, and the method comprises the following steps: collecting section coal pillar geological parameters; calculating a boundary position of a plastic zone according to geological parameters of the coal pillar, and dividing the coal pillar into a broken zone, a fractured zone and an original structure zone; basic roof strata are determined according to geological parameters of the coal pillar, the bearing capacity of the basic roof strata is calculated, the basic roof strata with the minimum bearing capacity serves as a roof cutting target layer, and the hydrofracture roof cutting drilling depth needed for penetrating through the target layer is determined; the broken area range serves as the influence range of surrounding rock pressure calculation, the static load q applied to the concrete wall by the surrounding rock pressure is calculated, the static load q is corrected through a dynamic load coefficient, and a supporting load Q is obtained; and according to the support load Q, reinforcement parameters are determined. Aiming at the surrounding rock deformation and instability of the adjacent roadway on the section coal pillar gob side under the deep well mining condition, the method effectively controls the surrounding rock deformation and instability of the adjacent roadway caused by working face mining disturbance.

The invention provides a method for analyzing the dynamic stability of a slope containing a mining cavern group under the action of dynamic and static loads, and belongs to the technical field of analysis of the dynamic stability of the slope containing the mining cavern group. In order to solve the technical problem that complex mechanical behaviors of a slope containing a mining cave group under the dynamic and static load coupling effect are difficult to accurately consider because most of existing slope stability analysis aims at single static load or dynamic load working conditions, the technical scheme adopted by the invention comprises the following steps: collecting end slope mining coal pillars and rock samples of rock stratums overlying the end slope mining coal pillars, and testing physical and mechanical parameters of the rock samples; the physical and mechanical parameters of all the rock stratums are finally selected in combination with related production materials of the mining area; calculating a shear strength parameter of the rock mass after the rock is damaged under the action of cyclic blasting vibration; calculating shear strength parameters of the end slope mining area-evolved weak layer under the action of blasting vibration; the stability of the slope containing the mining cavern group under the blasting vibration effect is calculated; the method is applied to the stability analysis of the power of the slope containing the mining cavern group.

The invention discloses a visual three-dimensional test device for grouting reinforcement and effect of a mine boundary coal pillar under a thin unconsolidated formation, and relates to the technical field of similar test simulation equipment for grouting reinforcement of the mine coal pillar. The device comprises a test support, an internal frame, a model storage box, a loading plate assembly, a model cutting mechanism, a vertical loading mechanism, a horizontal loading mechanism, a signal acquisition and processing mechanism, a three-dimensional test model, a coal mining simulation mechanism, a model grouting mechanism, a model separation mechanism and an effect visualization mechanism. According to the coal seam mining simulation mechanism, step-by-step, segmented and controllable excavation of a three-dimensional similar model in a closed space can be achieved, generation, expansion and penetration of coal seam mining roof rock stratum cracks are inverted, and the evolution process of a water guide channel is finally formed. According to the invention, the diffusion and runout characteristics of the grouting reinforcement slurry for the boundary coal pillar of the mine under the thin unconsolidated formation can be truly simulated, and the dynamic process of diffusion, condensation and reinforcement of the coal pillar by the slurry in the water-guiding damage fracture can be reproduced.

The invention discloses a gob-side coal pillar spraying device for preventing spontaneous combustion of coal and a using method of the gob-side coal pillar spraying device, and belongs to the technical field of mining equipment.The spraying device comprises a first spraying assembly, a detection assembly and a second spraying assembly, and the first spraying assembly is used for spraying for the first time; the detection assembly is used for detecting the thickness and / or uniformity of the first spraying; the second spraying assembly is used for conducting second-time spraying, and the spraying amount and / or the spraying speed of the second-time spraying are / is adjusted according to the detection result of the detection assembly. The detection assembly is used for detecting the spraying condition of the first spraying assembly, the second spraying assembly is used for conducting spraying on the position with the poor spraying effect, the using amount of coal mine air leakage stopping materials can be reduced compared with two-time complete spraying, and the spraying efficiency can be improved compared with manual spraying on the basis that the spraying efficiency is improved. And the spraying uniformity is guaranteed, and the spraying quality is improved.

The invention relates to the technical field of coal mine intellectualization, and provides an inter-face coal pillar digging and mining robot which comprises a right-angle turning scraper conveyor and a digging and mining robot body. The digging and mining robot is mounted on the right-angle turning scraper conveyor; the digging and mining robot comprises a cutting system, and the cutting system is located on a machine body of the digging and mining robot. Wherein the cutting system is driven by the electric cylinder to move, and vertical cutting of a rectangular section is completed through compound movement of the feeding electric cylinder and the height adjusting electric cylinder; after the cutting action is completed, a walking system of the digging and mining robot moves by one cut width along the right-angle turning scraper conveyor, and the actions are repeated until the whole section is pushed by one cut distance; wherein in the cutting process, the fallen coal is transferred into the right-angle turning scraper conveyor; the stability of the cutting system in the cutting and walking process is ensured through the anti-overturning effect of the guide sliding shoes in the walking system of the digging and mining robot and the force effect of the hydraulic support matched with the right-angle turning scraper conveyor.

The invention provides a method for determining advanced controllable roof cutting parameters of a thick and hard roof of a coal mine stope face, which comprises the steps of engineering general situation field investigation and survey, in-situ geomechanical test, goaf roof thickness / thin plate theoretical analysis, coal pillar or filling body vertical load theoretical analysis, numerical simulation calculation and engineering test verification. Analyzing the mechanical behavior of the working face roof based on a plate theory, verifying the correctness of a theoretical model through measured data, and changing boundary conditions to predict the mechanical behavior of the roof after roof cutting; the method comprises the following steps: analyzing the vertical load of a coal pillar or a roadside support body after roof cutting and the influence rule of roof cutting height and angle on the roadside support body through a mechanical model, and preliminarily obtaining better roof cutting parameters; by establishing a numerical model of different topping parameter combinations, different performance parameters are used for comparing and evaluating different topping parameters, so that the optimal topping parameter is determined; according to the method, advanced controllable roof cutting of the hard roof of the coal seam is achieved, and the mine pressure treatment effect in mining is predicted.

The invention discloses a pre-filling replacement section coal pillar double-roadway-reserved coal mining method which comprises the following steps: arranging a transportation uphill and a rail uphill in a coal seam along the inclination direction, pre-digging a transportation gate road and a rail gate road in the coal seam, forming a filling working face after the two gate roads are communicated, and simultaneously arranging the two filling working faces to carry out advancing type stoping, and solid waste material cemented filling is conducted on the goaf of the filling working face, after stoping filling of the two filling working faces is finished, a long-wall working face is formed by penetrating through the two adjacent crossheading of the two filling working faces, and retreating type stoping is conducted. A traditional section protection coal pillar is omitted, and the coal recovery rate is increased; meanwhile, resource utilization of the coal-based solid waste is achieved, and the problems of land resource waste and environmental pollution are solved.

The invention discloses a grouting and filling method for a cross-layer area of a coal pillar group in a residual mining area, and relates to the technical field of coal mining, which comprises the following steps of: (1) selecting a key layer; (2) a drill hole is constructed in the key layer, a directional initial crack is formed in the drill hole through frosted water jet cutting, then the two ends of the drill hole are set, and the initial crack is expanded to form a crack network in the mode that high-pressure fluid is injected into a hole sealing section; (3) grouting materials are adopted for conducting segmented grouting construction on the drill holes in the step (2), specifically, firstly, low-viscosity grout is used for filling a crack network formed through fracturing, then medium-viscosity grout is used for filling a coal pillar plastic area influenced by mining, and finally high-viscosity grout added with an accelerating agent is used for filling roof fractured rock mass and goaf and goaf roadways; and (4) after the slurry is solidified, a coal pillar-slurry vein body-overlying strata composite bearing structure is formed. According to the invention, the rock mass cohesive force and overall strength of the re-mining area can be obviously enhanced, and the stability of re-mining roadways and working face surrounding rocks is improved.

The invention discloses a grouting reinforcement anti-seepage method for a dam body of a coal mine underground reservoir, which comprises the following steps of: constructing a grouting hole at an artificial dam body position of a dam body to be treated, and performing segmented grouting on the grouting hole; the grouting materials are spread to the interiors of the artificial dam bodies, the interiors of the coal pillar dam bodies, the connecting positions between the artificial dam bodies and the coal pillar dam bodies, the connecting positions between the artificial dam bodies and the top plate rock stratum and the connecting positions between the artificial dam bodies and the bottom plate rock stratum; therefore, micropore cracks in the to-be-treated dam body and the connecting positions between the to-be-treated dam body and the top plate rock stratum and between the to-be-treated dam body and the bottom plate rock stratum can be effectively blocked, the leakproofness and the anti-seepage performance of the coal mine underground reservoir dam body are remarkably improved, and effective anti-seepage reinforcement of the coal mine underground reservoir dam body is achieved.

A method for recovery of residual coal pillars by freezing accumulated water in room-and-pillar mining areas is provided. A feasibility of repeated mining of residual coal pillars in room-and-pillar goafs is distinguished based on production data and exploration data of a mine. An accumulated water in the room-and-pillar mining areas is frozen to replace a paste filling material, which envelopes collapse roofs and gangues in the room-and-pillar goaf as a whole. The room-and-pillar goaf is filled with a frozen ice body. Roadways and mining faces are arranged in the frozen ice body. Coal cutter cuts the residual coal pillars and the frozen ice body. With the advancing of the mining face, the residual coal pillars are gradually recovered and melted water after the cutting is pumped out.

A mixed feed efficient mining method includes the steps that firstly, an air way, a machine way and a cutting hole are formed, a coal pillar is reserved at the left end of a working face, the length of the reserved coal pillar is larger than that of a single-drum coal mining machine, a machine nest is formed in the right side of the reserved coal pillar, and the length of the machine nest is not smaller than the sum of the length of a double-drum coal mining machine and the length of beveling feed; the single-drum coal mining machines are arranged in the roadways at the two ends of the fully mechanized coal mining face, the double-drum coal mining machines are arranged on the scraper conveyor at the machine nest section, when the double-drum coal mining machines run to be close to the left end or the right end of the fully mechanized coal mining face, reverse beveling feeding is directly carried out for next coal cutting, and it is not needed that coal is cut back and forth after conventional beveling feeding is carried out; coal pillars left at the two ends of the working face are cut by the two-end single-drum coal mining machine through vertical feeding, coal mining at the two ends and the middle section of the working face is achieved at the same time, the mining efficiency is greatly improved, the number of arranged working faces is reduced, the labor time of workers is shortened, and the economic benefits of enterprises are increased.

The invention discloses a key layer presplitting settlement control method based on overlying strata fracture angle arrangement. The method comprises the steps that geological mining parameters of a target mine are collected and determined; based on the physical and mechanical parameters of each rock stratum, determining the horizon height of the key stratum in combination with a thick and hard rock stratum judgment criterion; according to coal seam mining parameters and overlying strata lithology, the height of a water flowing fractured zone is judged, and high and low horizon classification is conducted on the water flowing fractured zone by combining the horizon of the key horizon; according to the development law of overlying strata damage along the fracture angle from bottom to top, the presplitting position in the horizontal direction of each layer key layer in the presplitting range is calculated and determined, and full-section directional presplitting cutting is carried out; based on thick and hard rock stratum mining-induced stress distribution characteristics and a damage deformation transmission mechanism, a working face moving boundary and a reduction distance of a building (structure) protection coal pillar after key stratum presplitting are calculated and determined. According to the method, presplitting implementation is guided based on the key layer fracture rule, and a new technical approach is provided for subsidence control of the mining area.

The invention relates to the technical field of mining engineering, in particular to an extra-thick coal seam fully mechanized caving face bearing pressure distribution simulation analysis method which comprises the steps of S1, bearing stability analysis; s2, crack analysis; s3, analyzing the influence of the topping operation; s4, evaluating feasibility of roof cutting roadway protection; according to the method, the stress data of the coal pillar are collected and analyzed to obtain the bearing stability of the coal pillar, the crack propagation speed is analyzed through image acquisition, so that the crack severity degree of the top plate is obtained, and the effect evaluation coefficient of the coal seam roof cutting operation is obtained according to the pressure parameter analysis of the coal seam working face after the roof cutting operation. The roadway deformation amount and the surrounding rock stability are obtained through video recording analysis, and then the feasibility of roof cutting roadway protection is obtained through analysis, so that the coal seam fully mechanized caving face bearing pressure influence evaluation index is comprehensively analyzed, targeted measures can be better taken to guarantee operation safety, the mining technology and process can be optimized, and the mining efficiency is improved.

The invention relates to the field of coal mine tunnel design, in particular to a method for cooperatively optimizing the width of a section coal pillar through undercut pressure relief and bottom plate filling. Comprising the steps of determining shear stress distribution in a first mining working face section coal pillar lower bottom plate; determining previous collapse positions of the basic roof; stoping and constructing a bottom cutting drilling hole in a maximum shear stress area in a lower bottom plate of the section coal pillar from the haulage roadway; lagging undercut pressure relief work is conducted, and bottom plate filling drilling is conducted from the track roadway to the position below the undercut pressure relief position at intervals; and grouting is conducted on the bottom plate rock stratum through the filling drill holes. According to the method, the bottom cutting drilling is constructed in the maximum shear stress area, so that the concentration of the shear stress of the bottom plate at the lower part of the section coal pillar is effectively reduced, and the stress of the section coal pillar is reduced. And furthermore, rock blocks at the bottom plate pressure relief position are upwards supported through bottom plate separation layer grouting filling at the lower part of the bottom cutting pressure relief position to prop against a cantilever structure formed by caving of the bottom plate, so that the overlying rock stress borne by the section coal pillar is shared, and the reserved width of the section coal pillar can be reduced.

The invention relates to the technical field of coal mining and mine safety engineering, and discloses a coal pillar stability dynamic monitoring and pressure relief control method for gob-side entry driving, which comprises the following steps: collecting multi-field coupling signals of a coal pillar, and collecting environmental data of a roadway; analyzing the stability of the coal pillar according to the multi-field coupling signal, and when an analysis result does not meet a stable condition and the environmental data does not meet an environmental condition, generating a cooperative control instruction of the high-pressure water jet system integrated with the solid-liquid waste collection device; executing directional hydraulic fracturing pressure relief operation on the coal pillar area according to the cooperative control instruction, and monitoring the stress distribution and fracture closing state of the coal pillar after pressure relief; hydraulic parameters of the high-pressure water jet system are adjusted according to the coal pillar stress distribution and the fracture closed state; and when the coal pillar recovers the stable state and the environmental data meet the environmental conditions, controlling the pressure relief operation of the coal pillar area according to the cooperative stop instruction. According to the method, the accuracy of dynamic monitoring and pressure relief control of the stability of the coal pillar of gob-side entry driving can be improved.

The invention relates to the technical field of coal mine intellectualization, in particular to an inter-face coal pillar digging and filling temporary supporting device, method and system.The inter-face coal pillar digging and filling temporary supporting device comprises a plurality of temporary supporting robots and end temporary supporting robots, and each temporary supporting robot is composed of a support I and a support II; the support I comprises a support I top beam, a support I base, a support I telescopic beam, a support I side protecting plate, a support I protecting plate, a support I supporting oil cylinder group and a support I connecting rod mechanism; the inter-face coal pillar digging and filling temporary supporting device provides forward power for a whole inter-face coal pillar digging and filling system, works in cooperation with a cutting system and a permanent supporting system to jointly complete inter-face coal pillar digging and mining supporting tasks, has the advantages of being simple in structure, convenient to operate and control, high in adaptability and the like, and has wide application prospects. The method is of great significance in solving the problem of temporary support in the process of excavating and mining coal pillar roadways between faces and guaranteeing the reliability, safety and self-adaptability of temporary support of the excavating and mining working faces.

The invention provides a non-uniform load lower end slope mining supporting coal pillar dynamic stability evaluation method, and belongs to the technical field of end slope mining supporting coal pillar dynamic stability evaluation. In order to solve the technical problem that under the condition that blasting vibration and overlying strata coupling effects are not considered in a conventional coal pillar stability evaluation method, risks possibly exist in personnel and an end slope coal mining machine due to supporting coal pillar parameter design, the adopted technical scheme comprises the steps that end slope retention coal and overlying strata rock samples are collected; testing physical and mechanical parameters of the retained coal and the rock sample of each overlying rock stratum; based on the dynamic response and deformation rule of the supporting coal pillar under the coupling action of the non-uniform static load and the blasting dynamic load, establishing a supporting coal pillar dynamic instability criterion based on a sudden change theory; based on the relation model of the maximum bending moment and the tensile stress of the coal pillar roof under the dynamic-static load coupling effect, a roof dynamic instability criterion based on the strength theory is established; the method is used for controlling the stability of the open pit coal mine end slope mining supporting coal pillar.

The invention discloses a rock burst risk identification method for a coal pillar, and the method comprises the steps: constructing a multi-source monitoring data set, extracting a plurality of dynamic characteristic parameters, such as micro-seismic energy and stress concentration ratio, constructing a comprehensive precursor score in combination with a coal pillar simulation critical value, and introducing a classification model to carry out the risk grade identification. The problem that a traditional method depends on a single index and early warning staticization is solved, meanwhile, through fusion of finite element simulation and real-time monitoring, the expression ability of the stability evolution process of the coal pillar is enhanced, the systematic recognition process from feature extraction, score evaluation to early warning output is achieved, the accuracy and adaptability of rock burst risk recognition are enhanced, and the risk recognition efficiency is improved. And the capabilities of high-discrimination risk discrimination and field application adaptability are realized.

The invention discloses a goaf remaining coal pillar stability comprehensive evaluation method based on InSAR and acoustics fusion, and belongs to the field of mine safety evaluation.The goaf remaining coal pillar stability comprehensive evaluation method comprises the steps that an SAR satellite suitable for a mining area is selected, SAR satellite image data of the mining area is obtained, sequential deformation analysis is conducted, the deformation rate and an accumulated deformation graph of the mining area are obtained, and a settlement abnormal area of the mining area is recognized; a coal pillar area of a mining area is drilled, and an ultrasonic logging device, an inter-well sound wave chromatography system and a sound emission monitor are arranged; performing comprehensive analysis on all the obtained data, and constructing a coal pillar stability evaluation model; and through the coal pillar stability evaluation model, grading the coal pillar stability, and predicting a coal pillar instability risk. According to the InSAR and acoustics fused goaf remaining coal pillar stability comprehensive evaluation method provided by the invention, high-precision evaluation of the coal pillar stability is realized through combination of earth surface deformation monitoring and deep coal pillar structure detection.

An upward horizontal subsection continuous mining and continuous filling mining method for a steeply-inclined close-distance coal seam group comprises the steps that the arrangement mode of a working face system is determined according to the distribution condition of a steeply-inclined close-distance coal seam, and the interval coal pillar width is determined according to the coal seam overlying rock pressure, the pressure-bearing coal pillar ultimate bearing capacity and the surrounding rock stability requirement; dividing the coal seam into a plurality of horizontal strips along the inclined direction, and horizontally dividing the strips into a plurality of narrow strips; the high-position narrow strip and the low-position narrow strip are communicated through a chamber arranged in the main haulage roadway and a finger-shaped connection roadway starting from the chamber; excavating equipment is arranged in the working face by adopting a strike longwall method, and narrow-strip-type graded mining and filling are carried out. Safe, green and efficient mining of the steeply inclined short-distance coal seam group is realized through a continuous mining and continuous filling process, improvement of working face system arrangement, optimization of a stoping process and control of surrounding rock deformation.

The invention discloses a method for predicting rock burst in a remaining coal pillar area based on monitoring data, and the method comprises the steps: constructing a synchronized and denoised basic data layer through the space-time interpolation completion of multiple types of monitoring data and a dual-channel noise suppression mechanism, and achieving the classification response of a sudden change signal and a progressive risk in combination with an adaptive risk weighting strategy, thereby achieving the prediction of the rock burst in the remaining coal pillar area. And meanwhile, by constructing a dynamic graph structure evolved along with time and combining a graph convolutional network and a circulating unit, combined modeling of a space coupling relationship and an evolution trend is realized, and the identification capability of the weak chain risk is improved while the prediction stability is guaranteed.

The invention provides a roadway surrounding rock stability judgment method and a classified supporting method, and relates to the technical field of soil layer or rock drilling and mine safety. The method comprises the following steps: S1, determining roadway surrounding rock stability influence factors; s2, dividing a rock mass strength index, a surrounding rock stress index, a surrounding rock integrity index, a roadway size index, a coal pillar ruler habit index, a water spraying index and the like; s3, determining a roof strength stress coefficient, a roof integrity coefficient and a side loosening coefficient; s4, performing field investigation or testing to obtain a classification index value, and determining an index threshold value through a fuzzy clustering method; s5, determining classification of non-impact roadways and impact dangerous roadways according to the roadway impact dangerousness and the impact danger index; and S6, determining a roadway support mode according to the roadway surrounding rock stability classification. According to the method, more comprehensive influence factors are considered, parameters are more convenient to obtain, values of factors required by field test classification indexes are facilitated, and scientific support of roadway surrounding rocks is achieved.

The invention discloses a digital twinning-based intelligent control system and method for butt-joint drilling of a horizontal well penetrating through a goaf coal pillar, and relates to the technical field of drilling and coal mine safety. The system comprises a data acquisition and transmission module for acquiring and transmitting multi-source heterogeneous data of a to-be-drilled goaf; the digital twinning module constructs a digital twinning model; the while-drilling perception and dynamic risk assessment module is used for acquiring and processing while-drilling measurement data and fusing the data with digital twinborn model data to generate a visual dynamic risk field; the intelligent decision and control module is used for generating a safe drilling path and a drilling parameter control instruction; the execution and well control module executes the control instruction and regulates and controls drilling equipment and a well control device; and the man-machine interaction module is used for displaying the risk information and realizing man-machine According to the method, the conversion of drilling safety from passive response to active prediction and intelligent control is realized, and the safety and the success rate of drilling operation penetrating through the goaf coal pillar are improved.

The invention relates to a gob-side entry driving small coal pillar dilatation deformation test system and method under simulation of dynamic and static loads, and belongs to the technical field of coal pillar dilatation deformation test. The system comprises a bearing frame unit, an axial pressure loading unit, a constraint frame unit, an impact loading unit, a monitoring unit and a controller, the axial pressure loading unit is arranged at the bottom of the bearing frame unit, the constraint frame unit is arranged on the upper side of the axial pressure loading unit, and the impact loading unit is arranged at the top of the bearing frame unit. The bearing frame unit is provided with a monitoring unit, the monitoring unit is connected with a data collector, and the data collector, the axial pressure loading unit and the impact loading unit are all connected with a controller. Different rotation angles of the gob-side entry driving lateral top plate are simulated, independent or synchronous application of the gradient load and the impact load on the top of the coal sample is realized in the axial direction, the test operation is simple, and the test accuracy is high.

The invention discloses a coal-pillar-free overlying strata separation layer grouting filling subsidence reduction method. The method comprises the steps that the positions of all key layers in a panel range, grouting key layers in overlying strata, the breaking distance of the grouting key layers and the mining width of a first mining face are determined; determining equivalent mining width according to the allowable mining width of a grouting key layer by utilizing the fulcrum effect of a caving zone compaction area, calculating the maximum face length of a replacement working face, and determining the length of the replacement working face within the range of the face length to obtain an overlying strata separation layer filling mining system; no coal pillar is reserved between the working faces of the overlying strata separation layer filling mining system; stoping the first mining surface, and grouting the lower part of the key layer following the stoping; when the replacement working face is mined, grouting is conducted on the lower portion of the key layer of the replacement working face; the remaining working faces are subjected to separation layer grouting and filling mining in sequence until mining of the whole panel is completed; wherein no coal pillar is reserved between all the working faces. The grouting filling subsidence reduction effect is improved, the mine coal resource recovery rate is further increased, and the mining cost is reduced.

The invention relates to a mine earthquake and rock burst hybrid dynamic disaster discrimination method and system, and the method comprises the steps: carrying out the numerical simulation of overlying strata motion evolution and stress field evolution according to geological data, and obtaining an analogue simulation result; according to the analogue simulation result, establishing a mechanical model in which the island coal pillar and the target rock stratum are simultaneously subjected to uniformly distributed load and horizontally concentrated stress; deducing an expression of dynamic and static load stress caused by fracture instability of the target rock stratum according to the mechanical model; and constructing a discriminant of the mine earthquake and rock burst composite dynamic disaster according to the dynamic and static load stress expression by combining a dynamic and static load superposition theory so as to reveal the occurrence mechanism of the mine earthquake and rock burst composite dynamic disaster of the extremely thick hard rock downhill coal pillar, and predicting the occurrence of the mine earthquake and rock burst composite dynamic disaster according to the discriminant.

The invention provides a close-distance coal seam dynamic coal-pillar-free mining method based on intelligent monitoring, which comprises the following steps: deploying a multi-parameter sensor network in an upper coal seam working surface, a lower coal seam working surface and overlying strata, monitoring the stress, displacement and fracture development state of the overlying strata in real time, and dynamically optimizing roof cutting parameters and a mining sequence in combination with a hydraulic fracturing intelligent regulation and control technology; in the mining process, monitoring data are analyzed through an MATLAB algorithm, an overlying strata caving prediction model is generated, and the overlying strata caving time and range are guided; and meanwhile, the carbon fiber reinforced polymer nano composite material is adopted for reinforcing the roadway side in the lower coal seam gob-retaining roadway, so that the structural stability is improved. Through intelligent monitoring and dynamic regulation and control, accurate control over overlying strata collapse is achieved, the stress concentration risk is reduced, and the resource recovery rate and mining safety are improved.

The invention discloses a mineshaft and industrial square coal pillar mining method. The mineshaft and industrial square coal pillar mining method comprises the following steps that S1, a well wall penetrating through a coal seam is replaced with a retractable wood crib; s2, square coal pillars on the periphery of the shaft are subjected to stoping; s3, a mining working face is arranged to be a small working face parallel to the trend or inclination direction of the coal seam, and the industrial square coal pillars are mined in a spiral mining sequence; s4, in the mining process, earth surface monitoring and well wall deformation monitoring are conducted on a shaft; and S5, in the mining process, the stress concentration position or the damage position in the shaft is protected. According to the mining method, the industrial square coal pillars can be effectively recycled, the service life of a mine is prolonged, and coal resources are fully mined, so that the mining rate of the coal resources is increased, and convenience is provided for mining operation of the coal resources.

The embodiment of the invention discloses a gob-side entry driving coal pillar unilateral operation self-anchoring opposite-penetrating anchor cable device and an anchoring method thereof, relates to the technical field of coal pillar anchoring, and can effectively solve the problem that an upper section goaf of a coal pillar is closed, construction is only performed on one side of a lower section, and opposite-penetrating anchor cable fixing and supporting cannot be achieved. The safety and the stability of the gob-side roadway are improved; the anchor cable device comprises an anchor cable body, a self-anchoring device is arranged at one end of the anchor cable body, and an anchor cable fastening device is arranged at the other end of the anchor cable body. The self-anchoring device comprises a self-locking device, the self-locking device comprises a self-locking device main rod, one end of the self-locking device main rod is connected with the push plate, the other end of the self-locking device main rod penetrates through a hollow hinge base hinged to a steel plate set, and a self-locking mechanism is arranged on the self-locking device. One end of the push plate is connected with the self-locking device main rod; the opposite sides of the steel plates in the steel plate group surround the self-locking device main rod; the steel plate set, the push plate and the hinged base form a containing cavity, and an anchoring agent is contained in the containing cavity.