168 results about "Coal pillar" patented technology

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 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 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.

The invention relates to the technical field of mining engineering and coal mine roadway surrounding rock control, and discloses a face-mining working face small coal pillar roadway surrounding rock control method which comprises the following steps: reinforcing roadway bearing pressure by reinforced concrete pier studs: in a mining super front section small coal pillar roadway, pouring a row of reinforced concrete pier studs along the center line of the small coal pillar roadway, the upper end of the reinforced concrete pier column abuts against the center area of the vault of the small coal pillar roadway. The frosted water jet directional roof cutting pressure relief technology is adopted for lateral roof cutting at the advanced section of the stope, so that the hard rock stratum of the top plate of the stope face collapses as soon as possible; a plurality of steel pipe cast-in-place piles arranged at intervals are arranged at the bottom corners of the small coal pillar roadway, and a plurality of crown beams are fixedly connected to the ends of the steel pipe cast-in-place piles. The method for controlling the surrounding rock of the small coal pillar roadway of the face-mining working face is convenient to construct and good in economic benefit.

The invention discloses a working face staggered layout method, product and equipment for coal mining ground fissures, and belongs to the technical field of mining subsidence and ecological restoration. The method comprises the steps that S1, the overall layout mode of upper and lower coal seam working faces is determined; s2, determining core mining parameters of the working face; s3, determining an external error distance or an internal error distance through numerical simulation; s4, acquiring surface subsidence data and verifying the surface subsidence data; and S5, determining the mining sequence of the upper coal seam working face and the lower coal seam working face according to the layout mode, and designing a whole-process production system to realize the landing of a production scheme. According to the method, the goal of weakening coal mining ground fissure development from the source is achieved by reasonably arranging the working faces of the upper and lower coal seams and adjusting the staggered distance of the working faces of the upper and lower coal seams without abandoning coal pillar resources and increasing the roadway tunneling cost, the ground fissure development degree can be weakened from the source, and the coal mining efficiency is improved. The problems of multiple procedures, long period, poor effect and the like of a traditional method are solved.

The present application relates to the technical field of impact low pressure prevention and treatment, and particularly relates to a method for preventing and treating impact ground pressure in an overlying residual coal pillar influence area, which comprises the following steps: determining a key layer of surrounding rock above a working face to be mined and a residual coal pillar in an overlying layer as a preset fracturing layer; determining a fracturing area to be fractured of the preset fracturing layer through the working face to be mined and the residual coal pillar, and the projection of the fracturing area to be fractured in a gravity direction covers the working face to be mined and the residual coal pillar; drilling a horizontal well in the preset fracturing layer after setting a vertical shaft on the ground, and then fracturing the preset fracturing layer; and adjusting the fracturing operation through a crack extension rate in the fracturing process. The method for preventing and treating impact ground pressure in the overlying residual coal pillar influence area adjusts the fracturing operation according to the crack extension rate to pre-fracture the surrounding rock above the residual coal pillar, and improves the safety of coal mining.

The application provides a coal pillar recovery and filling method for a section of a working face before mining, and belongs to the technical field of coal mining and filling. The technical problems of coal pillar reservation, resource waste and safety hazards in traditional mining are solved. The technical scheme is as follows: a coal pillar recovery and filling method for a section of a working face before mining, comprising the following steps: S1, planning a to-be-mined working face one, a to-be-mined working face two and a working face section coal pillar, and sequentially dividing and combining the working face section coal pillar into areas; S2, recovering the coal resources in the combined area G1 and filling the coal pillar area with filling materials; S3, repeating the above step S2 to sequentially recover the coal resources in subsequent combined areas G2, G3,..., Gn and fill them. The beneficial effects of the application are as follows: the method cooperatively recovers the coal pillar and excavates the working face roadway, safely recovers the coal pillar, realizes coal-based solid waste resource disposal, has the advantages of safety, high efficiency, environmental protection and economy, and provides a sustainable mining solution for the mine.

The application discloses a residual coal pillar stability analysis method and device considering time effect, a medium and a product, relates to the field of coal resource mining, and comprises the following steps: constructing a generalized Kelvin model based on the geometric parameters and mechanical parameters of the residual coal pillar; performing residual coal pillar creep deformation analysis according to the generalized Kelvin model; constructing a coal pillar-roof coupling energy model based on a creep deformation equation; performing variational analysis on the coal pillar-roof coupling energy model based on the principle of minimum potential energy; obtaining the effective bearing time of the residual coal pillar according to the stability criterion and in combination with the geometric parameters of the residual coal pillar, the mechanical parameters of the coal body and the stiffness parameters of the roof; and performing secondary mining safety evaluation according to the effective bearing time. The application can effectively improve the scientificity and accuracy of stability evaluation in the secondary mining process of the residual coal pillar in the old mining area, reduce the safety risk of the secondary mining operation, and provide technical support for the safe and efficient development of residual coal resources.

The invention relates to the technical field of safety monitoring and early warning, and particularly provides a safety monitoring system and method for a coal mine underground reservoir coal pillar dam body. The system comprises a data acquisition device configured to be used for acquiring real-time monitoring data of a coal mine underground reservoir coal pillar dam body and sending the real-time monitoring data to a data analysis device; wherein the real-time monitoring data comprises deformation monitoring data, stress monitoring data, water body monitoring data and meteorological monitoring data; the data analysis device is configured to be used for receiving the real-time monitoring data; substituting the real-time monitoring data into a pre-constructed safety coefficient calculation model to obtain a current safety coefficient of the coal pillar dam body; if the current safety coefficient meets a preset early warning condition, starting an early warning device, and sending an early warning result corresponding to the current safety coefficient to the early warning device; and the early warning device is configured to receive the early warning result and perform early warning based on the early warning result. The safety monitoring accuracy of the coal mine underground reservoir coal pillar dam body can be improved.

The invention relates to the technical field of gas control, and discloses a coal-pillar-free self-formed roadway 110 construction method well up-down integrated area gas control method which comprises the following steps: S1, dividing a coal resource into a planning area, a preparation area and a production area according to the time of mine construction or mining operation of the coal resource; s2, gas pre-extraction treatment on the well in the planning area; s3, advanced treatment of underground gas in the preparation area; s4, precise advanced treatment of underground gas of the working face is carried out; and S5, working face stoping. According to the method, the above-well drilling pre-extraction technology is utilized, the above-well extraction purpose of replacing space with time is achieved, accurate advanced underground extraction is conducted on gas of the continuous working face through the coal-pillar-free self-formed roadway of the upper working face in the production area, and the underground extraction purpose of replacing time with space is achieved; the supporting pressure of the working face is reduced, the stress distribution rule is changed, the pressure difference between coal seam gas and roadway atmospheric pressure is reduced, and the crossheading gas emission amount is reduced.

The application provides a constant-resistance anchor rock beam stability control method for a thick coal seam strike super-long working face, which realizes constant-resistance reinforcement of a lower crossheading roof by excavating upper and lower crossheadings in the thick coal seam, reinforcing the lower crossheading roof by using constant-resistance anchors and W steel along the strike, and filling the mined-out side of the roadway with the cut-off gangue during the coal mining process to form a complete roadway; the roof support is realized by restraining the concrete retractable support, and the deformation requirement of the roadway roof is met by the retractability of the support, thus solving the support problem that the constant-resistance anchors cannot be hung in the stable rock stratum due to the limited length, enabling the top-cutting pressure-relief gob-side entry retaining technology to be successfully applied in the thick coal seam non-pillar mining, and being low in cost and not affecting the working face advancing and mining, and having incomparable advantages over the roadway-side filling gob-side entry retaining non-pillar mining, and being a more scientific and reasonable thick coal seam non-pillar mining method.

The application discloses a kind of InSAR and acoustic fusion's goaf left coal pillar stability comprehensive evaluation method, belong to the field of mine safety evaluation, including selecting SAR satellite suitable for mining area, obtaining SAR satellite image data of mining area, then carry out time series deformation analysis, obtain the deformation rate and cumulative deformation diagram of mining area, identify the subsidence abnormal area of mining area;Drilling is carried out in the coal pillar area of mining area, and ultrasonic logging device, interwell acoustic tomography system and acoustic emission monitor are laid out;Comprehensive analysis is carried out to all the data obtained, and a coal pillar stability evaluation model is constructed;Through coal pillar stability evaluation model, the coal pillar stability is classified, and the coal pillar instability risk is predicted.The application provides a kind of InSAR and acoustic fusion's goaf left coal pillar stability comprehensive evaluation method, which realizes high-precision evaluation of coal pillar stability by combining surface deformation monitoring and deep coal pillar structure detection.

The invention discloses a rock burst mine main roadway protection coal pillar three-dimensional pressure relief and top plate weakening method. The method comprises the following steps that 1, the range, affected by mining, of a main roadway and the key weakening layer position of a top plate are determined; 2, a directional drilling construction position is selected according to the width of the protection coal pillar; 3, according to the construction position, the parallel top plate directional drilling arrangement mode is designed; 4, hydraulic fracturing is carried out to form a continuous roof weakening zone; and 5, grouting filling of the fractured fractures and the goaf is executed. According to the rock burst mine main roadway protection coal pillar three-dimensional pressure relief and roof weakening method, the problems that an existing roof control technology mostly focuses on the interior of a working face, scientific limitation on the depth of a weakening horizon is lacked, and roof leakage is caused due to the fact that horizon selection is too low are solved.

The invention relates to the technical field of coal mining, in particular to a method for treating a room-and-pillar goaf through grouting and recycling coal pillars through fully mechanized mining, which comprises the following steps: forming a detection directional hole through a directional drilling technology, performing field detection on a distribution area of the room-and-pillar goaf, constructing a three-dimensional space model of the room-and-pillar goaf, and constructing a three-dimensional space model of the room-and-pillar goaf; gradually obtaining the range of the room-and-pillar goaf according to the boundary points of the room-and-pillar goaf detected by the plurality of detection directional holes; based on the range of the room-and-pillar goaf and the internal structure of the room-and-pillar goaf, the arrangement position, number and depth of drainage drill holes are obtained; based on the arrangement position, number and depth of the drainage drill holes, accumulated water in the goaf is introduced into a mine drainage system through a drainage pipe; grouting treatment is conducted on the room-pillar type goaf through the grouting drill holes; and after the working face is arranged according to the working face arrangement scheme, coal pillar recovery operation is carried out according to the formulated mining scheme.

This application relates to a method, device, and storage medium for coordinated control of overburden deformation in continuous mining and filling faces. The specific scheme involves: obtaining the height of the strip coal pillars and the preset overburden subsidence value of the target mining area; determining the width of the strip coal pillars and the number of filling rounds in the target mining area; constructing an overburden coordinated deformation model based on the number of filling rounds in the target mining area; obtaining the overburden layer load intensity, uniaxial compressive strength of the coal body, and elastic modulus of the coal body in the target mining area; determining the target elastic modulus of the filling body and the total overburden subsidence based on the strip coal pillar width, strip coal pillar height, overburden layer load intensity, uniaxial compressive strength of the coal body, and preset overburden subsidence value using the overburden coordinated deformation model; and determining the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body. This application improves the rationality and accuracy of key parameters in coal resource filling and replacement mining.

The invention relates to the technical field of coal mining, in particular to a thick coal seam internally-staggered roadway mining method which comprises the following steps that a first mining working face is arranged, specifically, an air return roadway of the first mining working face is located on a coal seam top plate, and the middle portion of a cutting hole of the first mining working face is located on a coal seam bottom plate; the return airway facing the first mining working face climbs at a preset gradient; the bottom coal is reserved according to the gradient set by the open-off cut of the first mining working face; a transportation roadway of the post-mining working face is located on a coal seam bottom plate and arranged below bottom coal reserved on the pre-mining working face, and the middle portion of a cut of the post-mining working face climbs towards an air return roadway of the post-mining working face at a preset gradient; according to the mining method, section coal pillars are canceled, the mining rate is increased, meanwhile, uneven sinking of overlying strata and the development height of a water guiding fracture zone are effectively controlled, and efficient and low-loss mining of the thick coal seam is achieved.

The invention provides a grouting settlement reduction method and system for mining without coal pillars or narrow coal pillars, and relates to the technical field of coal mining, the method comprises the following steps: construction of a first grouting drill hole: constructing the first grouting drill hole in the direction of a surface soil layer towards a grouting layer on a mining surface; grouting settlement reduction is conducted, specifically, grouting is conducted on the grouting layer through the first grouting drill holes, and a filling body is formed in the separation layer space; reinforcing drilling construction: after coal is mined from the mining surface to form a goaf, reinforcing drilling is constructed on the mining surface in the direction of the surface soil layer towards the goaf; grouting reinforcement: grouting the natural accumulation area and the load influence area of the goaf through the reinforcement drill holes to form a support body; and the first grouting drilling construction, grouting sinking reduction, reinforcing drilling construction and grouting reinforcing operation are repeated till sequential mining of the coal on all the mining faces is completed. According to the method, a double subsidence reduction measure combining overlying strata separation layer grouting filling and goaf grouting reinforcement is adopted, and the problem that mining subsidence is difficult to control due to secondary development of separation layers in the mining process of adjacent working faces is solved.

The invention belongs to the technical field of coal mine underground fire prevention and extinguishing, and particularly discloses a method for preventing spontaneous combustion of a coal pillar in small coal pillar mining. The parameters comprise the working face mining coal seam shortest spontaneous combustion period, the goaf coal spontaneous combustion oxidation zone on-site measurement air inlet and return side average width, the coal face actual daily propulsion degree and the small coal pillar thickness; based on the parameters, the distance L between the drill hole groups is determined; drilling the adjacent goaf every L in the roadway of the stope face along the mining direction of the stope face to form a plurality of drill hole groups which are distributed at intervals; and a gelling agent is injected into the triangular non-caving area through the drilling hole set, and a plurality of filling isolation bodies distributed at intervals are formed in the triangular non-caving area. The multiple filling isolation bodies distributed at intervals are arranged in the triangular non-caving area, the air leakage channel is blocked through the filling isolation bodies, the spontaneous combustion oxygen supply condition is cut off, and the spontaneous combustion problem is effectively restrained.

The invention provides a short-wall mining system and method based on collaborative operation of a mechanical arm and a jumbolter. The system comprises a plurality of coal pillars distributed in an array, an automatic anchor rod supporting device, a jumbolter, a continuous miner, a shuttle car, a crushing reversed loader and a belt conveyor. The mining area is divided into more than three parallel roadways by the plurality of coal pillars; the anchor rod automatic supporting devices are arranged on the two sides of the continuous miner and the anchor rod drill carriage respectively, and the anchor rod automatic supporting device arranged on the continuous miner is used for implementing one-time anchor rod automatic supporting operation in the cutting process; the anchor rod automatic supporting device arranged on the anchor rod drill carriage is used for implementing secondary anchor rod automatic supporting operation; the continuous coal mining machine is used for alternately working between roadways, and the anchor rod drill carriages are used for being matched with the continuous coal mining machine to synchronously work in the roadways which are tunneled and not completely supported. According to the mining system, part of anchor rods can be supported in advance in the roadway tunneling process, and the roadway tunneling safety is improved.

The invention discloses a coal pillar high-temperature spontaneous combustion fire source positioning inversion method, system and device and a medium, and relates to the technical field of coal mine safety. The method comprises the steps that temperature sensors are arranged on the surface of a coal pillar, coordinates and temperature data of limited monitoring points are collected, and a sample set is constructed; using a support vector regression model to learn a mapping relation between coordinates and temperature; generating a grid based on the geometric boundary of the coal pillar, and inverting a global temperature field through the trained SVR model; the highest-temperature area in the temperature field is extracted after cutting, and the accurate position of a fire source is determined; according to the method, on the premise that the arrangement number of the temperature detectors is reduced and the cost is controlled, positioning and monitoring of the high-temperature fire source in the coal pillar can be accurately achieved, and reliable technical support is provided for coal pillar fire prevention and control.

The application discloses a large-diameter drilling parameter optimization and construction method based on a drilling pressure relief principle, which comprises the following steps: firstly, determining the width of a reserved coal pillar and the width of a to-be-excavated roadway, then determining the layout mode of large-diameter pressure relief drilling, then evaluating the impact danger degree of the coal seam where the to-be-excavated working face is located, and determining the corresponding drilling diameter according to different impact danger degree grades; determining the horizontal interval of adjacent large-diameter pressure relief drilling according to the pressure relief zone radius of each large-diameter pressure relief drilling, ensuring that the pressure relief zones formed around all the drillings can be interconnected, so as to form a complete weakened zone; determining the length of the large-diameter pressure relief drilling according to the coal seam mining thickness of the to-be-excavated working face, ensuring that the effective length exceeds the position of the peak value of the coal wall support pressure, so as to effectively relieve the pressure of the to-be-excavated roadway and the to-be-excavated working face; finally, performing pressure relief construction according to the determined parameters, so that the drilling construction efficiency can be improved under the premise of ensuring the safety of the coal mine.

The present application provides a kind of method for inverting roof fracture position of gob-side entry retaining end, and relates to the technical field of coal mining.The method comprises the following steps: drilling into the coal body of working face, installing anchor at different roof positions, monitoring the displacement change of deep foundation point of anchor, obtaining first change data; measuring the change of stress meter located behind support in goaf, obtaining second change data, thereby monitoring the fracture position along the strike and dip of working face; monitoring the stress change of multiple positions at different distances from roadway on the side of coal pillar, obtaining third change data; inverting the breaking rule of end roof by first change data, second change data and third change data.The present application inverts the breaking rule of end roof by the change of three kinds of data obtained by monitoring; the present application provides a determination method for fracture on both sides of end roof, and through the monitoring of stress change in goaf, the sub-stage breaking of roof can be monitored.

The invention belongs to the field of coal mine filling mining, and particularly relates to a one-side goaf overlying strata grouting filling green coal mining method which comprises the steps that a plurality of goaf grouting drill holes close to a coal wall supporting area are constructed in a mined working face; constructing a grouting filling system; injecting gangue mixed slurry into the goaf; gob-side entry driving is carried out on the reserved section coal pillar, and the width of the section coal pillar can meet the requirement that under auxiliary supporting of a goaf filling body, the section coal pillar is kept stable after working face stoping and before basic roof caving, and the section coal pillar is unstable after basic roof caving; the goaf grouting drilling holes are changed into separation layer grouting drilling holes; a plurality of separation layer grouting drill holes are constructed in the working face to be stoped; a grouting filling system is connected with the separation layer grouting drill hole; and the working face to be stoped is stoped, and grouting filling is conducted on the self-grouting drill holes. According to the method, the stress of the section coal pillar can be reduced, so that the reserved width of the section coal pillar is reduced, the coal loss is reduced, the grouting filling amount of the separation layer can be ensured, and the gangue absorption amount is ensured.

The invention relates to the technical field of underground mine roadway support, in particular to a gob-side entry driving small coal pillar control device suitable for influence of overlying remaining coal pillars, which comprises an operation groove formed in the inner side of a roadway in a coal rock mass, a concrete slab is poured in the operation groove, and a plurality of through holes are formed in the concrete slab and the coal rock mass. The through holes penetrate through two adjacent roadways; according to the grouting device, the grouting pipes are installed in the through holes, then the outer ends of the grouting pipes are fixed through the nuts and the connecting parts, then grouting is conducted in the grouting pipes, and after grouting is completed, the grouting pipes are fixed through the nuts and the connecting parts. The inner protection plate, the air bag and the outer protection plate are sequentially installed at the outer end of the grouting pipe from inside to outside, finally, the outer protection plate is fixed through the fixing part, finally, the air bag is inflated, the air bag expands inwards, the side wall of the inner end of a roadway is comprehensively supported, and the coal rock mass is well maintained and reinforced.

The invention belongs to the technical field of coupling tests, and particularly relates to a device and a method for testing the stability of a waterproof coal pillar in a high-water-pressure environment, and the device comprises a double-cavity opposed pressure-bearing model bin, wherein a top plate-coal pillar-bottom plate combined sample is embedded in the middle of the double-cavity opposed pressure-bearing model bin; the true triaxial loading frame is used for providing axial pressure sigma1 and two-way confining pressure sigma2 and sigma3 for independent loading; the single-side high-water-pressure loading system comprises a servo plunger pump, a pressure stabilizing energy accumulator and a throttling / back pressure valve; the composite self-tightening sealing assembly comprises a metal conical surface clamping sleeve, a double-O-shaped ring, a trapezoidal lip-shaped ring and a replaceable epoxy sealing gasket; the seepage and pore pressure measuring chain comprises an inlet volume flowmeter and an outlet volume flowmeter; the multi-field monitoring system comprises a strain gauge / optical fiber FBG array, a displacement meter LVDT, a three-dimensional stress cake, an acoustic emission sensor and a thermometer; according to the data acquisition and linkage control platform, synchronous acquisition is conducted on all channels larger than or equal to 1 kHz, and linkage control is conducted on water pressure, confining pressure, axial pressure and seepage flow; a safety pressure relief and blowout prevention shield is composed of two-stage overflow, a rupture disk and a transparent shield.

The application discloses a kind of deep-buried mine thick coal seam hard roof partitioned cooperative fracturing method.Working face hard roof breakage position is determined, according to hard thick roof constraint boundary condition, the position of roof breakage is determined;Affected by the goaf of last working face, the roof of mining working face presents different boundary conditions on its two side coal pillars, wherein simply supported is formed at the section coal pillar of empty side, solid side section coal pillar forms fixed support, while the roof in goaf is difficult to form hinged structure, according to the layout of adjacent working face, the hard thick roof is regarded as a whole, different fracturing means are used in empty side and solid side roadway, and partitioned pressure relief is implemented, hydraulic fracturing fracturing method is implemented in the roadway of empty side of working face, and blasting fracturing method is implemented in the roadway of solid side.The application will solve the problem of hard thick roof strong rock pressure prevention and control in deep-buried mine thick coal seam, help to prevent and control the appearance of deep-buried mine strong rock pressure, and can also scientifically control the sudden instability of hard thick roof breakage.

The present application relates to the technical fields of mine support and filling, and discloses a large-mining-height lane type filling body-frame combined bearing structure and a mounting method, wherein the large-mining-height lane type filling body-frame combined bearing structure comprises a bearing structure, an adjusting assembly, a protective net and a connecting assembly; the bearing structure comprises a plurality of cross braces and side braces for connecting the cross braces, the side braces are arranged at two ends of the cross braces, the adjusting assembly is mounted at one end of the cross brace, and the protective net is fixedly mounted on the side brace; the top end of the connecting assembly is used for being connected with a roof anchor rod head at a corresponding position, and the bottom end of the connecting assembly is connected and fixed with the cross brace. The bearing structure and the mounting method are simple and efficient, can improve the stability of a mining lane coal pillar side slope and a filling body side slope, can improve the anti-deformation capacity of the filling body when being cast in the filling body, and are favorable for safe, efficient and rapid mining of the lane.

The utility model relates to the technical field of coal pillar compressive deformation test, and discloses a test device for monitoring vertical compressive deformation of a coal pillar, which comprises a cabinet body and a test mechanism, one side of the cabinet body is opened, a glass window is hinged at the opening of the cabinet body, and a coal pillar sample is placed in the cabinet body. A plurality of displacement sensors are uniformly and circumferentially distributed on the outer wall of the coal pillar sample in the vertical direction, the top end of the coal pillar sample is connected with a testing mechanism, the testing mechanism comprises a pressure applying piece, an angle adjusting piece and a rotating piece, and the angle adjusting piece performs angle change adjustment on the top, in contact with the coal pillar sample, of the pressure applying piece. Under the cooperation of the pressure applying piece, the angle adjusting piece and the rotating piece, pressure applying adjustment can be carried out on the top of the coal pillar sample, pressure applying in different directions can be carried out on the coal pillar sample, and therefore specific data of the vertical compression deformation of the coal pillar sample can be obtained through the displacement variation of the displacement sensors.

The utility model relates to the technical field of roof-cutting pressure-relief coal-pillar-free self-roadway-forming waste rock blocking, and discloses a roof-cutting pressure-relief coal-pillar-free self-roadway-forming waste rock blocking U-shaped steel connecting structure which comprises a U-shaped steel body and a clamping cable and is provided with a control assembly, a long opening of a limiting hole and a transverse pushing moving rod. The movable rod abuts against the surface of the vertical rod, so that a movable plate fixed to the surface of the vertical rod is stressed and transversely moves on the surface of the supporting rod under supporting of a first spring, when the movable plate moves, a positioning rod fixed to the surface of the movable plate is clamped into a clamping hole formed in the surface of the clamping cable, the positioning rod is attached to the top of the clamping cable, and after attachment, the movable plate is fixed to the top of the vertical rod. When the clamping cable is connected with the U-shaped steel body, the movable rod is longitudinally pushed in the vertical rod, the movable rod can be clamped into the corner of the limiting hole, preliminary positioning of the clamping cable is completed, and therefore the stability of the clamping cable in the connecting process of the clamping cable and the U-shaped steel body is guaranteed, and the situation of deviation and dislocation caused by shaking is avoided.