78 results about "Drill site" patented technology

The invention discloses a deep thick and hard rock stratum roof directional long drill hole staged fracturing weakening method and system, and relates to the technical field of coal mining. The method comprises the following steps: determining a fracturing target horizon according to mining area geological data and to-be-treated working face monitoring data; a drill site construction position is determined, and drilling track parameters are determined in the fracturing target horizon; a fracturing assembly is installed, fracturing construction parameters are determined, and the operation sequence of drilling construction and fracturing construction is determined; and drilling construction is conducted according to the operation sequence, fracturing construction is conducted through the fracturing assembly, and the stability condition of the roadway is monitored in the whole process and before and after. The technical scheme aims at weakening far-field strong stress of a top plate of a thick and hard coal rock stratum overlying a deep coal mine underground roadway, and is particularly suitable for design of a directional long drilling hole fracturing weakening scheme in the field of deep thick and hard rock stratum top plate pressure relief and roadway protection engineering. And the roadway deformation condition under the disturbance influence of advanced high supporting stress and mining strong stress of the working face is improved.

The invention discloses a hydraulic engineering full-link core drilling quality detection intelligent management method and system, and the method comprises the steps: S1, selecting a drilling position for drilling and coring, and obtaining a sample; s2, sample label information is read and synchronized to an LIMS system, electronic tracking codes are generated, and classified storage is carried out according to preset positions; s3, scanning the code to obtain sample information, verifying the identity of the sample, and testing the sample after the sample is correct; s4, after sample detection is finished, encrypting sample data, transmitting the encrypted sample data to an LIMS system, and generating a sample report through a Web application program in combination with an NLG; and S5, pushing the detection report to the representative unit through a notification mechanism, and synchronously sending the report to the representative designated mailbox to complete transmission of report information. According to the method, a whole-process intelligent ecological system from a drilling site to laboratory detection to report delivery is formed, the space-time limitation and technical barriers of information acquisition are broken, and the timeliness and transparency of project quality information transmission are improved.

The invention discloses a neural network-based coal mine drainage and drainage quantity prediction and drill site optimization design method, which comprises the following steps of: deeply analyzing stratum characteristics such as sand shale proportion and lithology category by introducing a space occurrence characteristic quantitative model and a convolutional neural network; historical drainage water volume data and real-time monitoring information are dynamically learned in combination with the bidirectional long-short-term memory network, and the prediction precision is remarkably improved. Meanwhile, a drill site adaptive optimization module is constructed based on a reinforcement learning algorithm, and the drill hole spacing, depth and layout mode are automatically generated according to a prediction result. According to the method, sand shale category division and space occurrence characteristics are incorporated into a neural network input layer, and the problem that lithology heterogeneity modeling is insufficient in a traditional method is solved; and through dynamic coupling prediction and design links, real-time optimization of drilling parameters is realized, and the universality and flexibility of the technology are remarkably improved. The invention provides an efficient, accurate and economical technical means for coal mine water disaster prevention and control.

A drainage and gas production device for a horizontal well for coalbed methane of a coal mine area, the device comprising a surface horizontal well and a downhole borehole section (6), wherein a horizontal section (4) of the surface horizontal well is in communication with the downhole borehole section (6), a communication point (7) of the horizontal section (4) of the surface horizontal well and the downhole borehole section (6) is located at an end A or a middle or an end B of the horizontal section (4) of the surface horizontal well; and the other end of the downhole borehole section (6) is connected to a gas-water-slag separation device (15) located in a downhole drill site (5).

The invention belongs to the technical field of coal mine safety, and provides a goaf gas treatment method suitable for adjacent coal seams of a high-gas coal mine. The method comprises the following steps: arranging a basic ventilation loop; arranging a high drainage roadway; an extraction drill site and an extraction drill hole are arranged; arranging an extraction pipeline; before recovery, gas adjacent to a coal seam is pre-extracted through a high negative pressure extraction pipeline; and during recovery, the hole bottom of the extraction drill hole is cut off so as to be communicated with the goaf, and the extraction drill hole extracts gas in the goaf through a low-negative-pressure extraction pipeline. And gradually advancing the stope face, gradually dismantling the closed outer wall of the high drainage roadway, the drainage drill sites, the high negative pressure drainage pipeline and the low negative pressure drainage pipeline in the high drainage roadway, and simultaneously extracting gas in the goaf by the high drainage roadway and the drainage drill holes. The function of the extraction mode is flexibly configured according to the mining mode, and the problem that gas at the upper corner and the air return crossheading exceeds the limit, which cannot be solved by a single high extraction roadway, is solved. The gas extraction efficiency is improved, and the safety production of a stope face is ensured.

The invention relates to the technical field of coal mines, in particular to an underground high-confined aquifer area treatment method which comprises the following steps: S1, performing underground directional drilling treatment, layering a high-confined aquifer according to the thickness and rich water distribution characteristics of the high-confined aquifer, and constructing a plurality of main directional drill holes in a directional drill site, then a plurality of branch directional drill holes extend from the same layer or different layers of each main directional drill hole to the plane direction of the treatment area from the directional drill site, and a grouting channel is formed; s2, grouting is conducted on the directional drill hole; and S3, underground common drill verification is carried out, and the treatment effect is checked through common drill holes which are arranged in parallel at equal intervals. Compared with a common drilling treatment working face, average construction drilling holes are greatly reduced, casing pipes and cement materials can be saved, the moving frequency and construction time of a drilling machine are reduced, and manpower and material resources are reduced.

The invention discloses a mining separation layer crack filling method based on a ground comb type directional drilling group. The mining separation layer crack filling method comprises the following steps that (1) the position of each key layer is determined; (2) selecting a proper key layer as a grouting layer position; (3) establishing a numerical calculation model by adopting numerical simulation software, and simulating and analyzing the evolution law of the separation layer in the advancing process of the coal face; (4) a drill site is arranged outside the influence range of the mining area, and a main hole for ground comb type directional drilling is constructed; (5) designing a branch hole track of the ground comb type directional drilling by using Landmark software; (6) a ground comb type directional drilling group is arranged; and step (7), performing separation fracture filling on a grouting layer in the overlying strata on the coal mining working face by constructing multiple groups of ground comb type directional drilling holes. By means of the method, ground surface settlement control of mining-filling synchronous operation can be achieved.

The invention discloses a drill site arrangement method for advance pre-grouting directional drilling construction of a working face in a tunnel, which comprises the following steps of: firstly, evaluating geology and structure: detecting and analyzing geological conditions of tunnel surrounding rock, evaluating stability, arranging multiple stages of construction platforms in the tunnel, arranging a drilling machine on each stage of construction platform, and performing directional drilling construction by using the drilling machine; and after drilling is completed, grouting is conducted through grouting equipment. By means of the method of excavating the working platform in a layered mode, the opening angle of each drill hole around the tunnel can be taken into consideration, construction can be conveniently carried out, the horizontal drilling precision is improved, meanwhile, the target front distance needed by horizontal directional drilling in the tunnel can be shortened, and the construction occupied space is reduced; drilling operation can be synchronously carried out at different positions around the tunnel, the construction efficiency is greatly improved, a plurality of drill holes are drilled at the same time in unit time, synchronous grouting can be carried out on the plurality of drill holes at the same time during grouting, a preliminary strengthening ring can be formed around the tunnel, and the mutual combination effect is improved after grout is diffused.

The invention discloses a gas real-time monitoring platform suitable for a drilling site, and relates to the technical field of gas monitoring, a partition monitoring module is arranged to monitor a plurality of monitoring areas of a drilling channel under the drilling site, and a communication interaction unit transmits real-time gas monitoring data. An interactive supervision module is arranged to supervise the transmission process of gas monitoring data of a monitoring area which triggers an area supervision event for a period of time, and in the supervision process, according to network evaluation data and an instantaneous network stable value and a comprehensive network stable value which are calculated in real time, when the supervision event is triggered in the monitoring area, the monitoring area is monitored. According to the technical scheme, the most appropriate action main body area can be dynamically screened out, it is ensured that when the network condition is poor, gas monitoring data can be preferentially transmitted through a path with the relatively stable network condition, the data transmission delay and packet loss rate are effectively reduced, the high efficiency and stability of data transmission are guaranteed, and the reliability of gas data transmission on the drilling site is improved.

The application discloses a kind of prevention and cure method of gas over-limit of ultra-thick coal seam fully mechanized caving face initial mining, when roadway layout in ultra-thick coal seam planning, a main air inlet lane, a main air return lane and panel drainage lane are constructed in mining area boundary;The production process before the first weighting of roof is the initial mining of working face;Before working face mining, drill site is constructed in the lane adjacent to the lane on both sides of working face, and directional interception extraction is carried out in the drill site to the pre-caving top coal body above the mining height of fully mechanized caving face;Before working face mining or during working face formation, bedding borehole is constructed in advance in drainage lane, and the borehole is constructed at the top of the roadway wall of drainage lane, to ensure that the final hole of borehole is located in different height range of working face not collapsed solid coal;To prevent gas over-limit in upper corner of working face, short borehole is constructed in the coal body not collapsed upward in the lane on one side of working face air return lane, and the borehole faces the advancing direction of working face mining, to realize interception extraction before coal body collapse.

The invention provides a long-distance high-pressure grouting advanced modification method for a coal mine working face, which belongs to the field of coal mining and comprises the following steps of: drilling a plurality of first grouting holes at intervals along the tunneling direction of a roadway by taking a top plate as a reference; the roadway is tunneled after the first grouting hole is sealed and grouted; a drilling site is formed in the roadway, and a plurality of second grouting holes are drilled through the drilling site; and the second grouting holes are sealed and grouted. The coal mine reinforcing method aims at solving the problem that in the prior art, a coal mine reinforcing mode is difficult to comprehensively reinforce faults, wrinkles, collapse columns, areas with low coal and rock mass strength and peripheral key stress rock stratums. The grouting pre-reinforcement method has the advantages that grouting pre-reinforcement is carried out aiming at faults, folds, collapse columns, roadway tunneling, working face stoping and the like which are affected by low strength of coal and rock masses, the reinforcement effect is improved, the roadway tunneling efficiency is improved, and safe stoping of the working face is guaranteed.

The utility model relates to a drill rod frame sinking type small-size automatic drill carriage which comprises a main machine part and a power part, the main machine part comprises a main machine body, a working platform, a drill rod frame assembly, a mechanical arm, a supporting column, a working mechanism and a main machine crawler belt assembly, and the working platform is arranged above a main machine rack. The main machine body comprises a left machine body and a right machine body which are symmetrically arranged left and right, and a drill rod frame sinking area is formed between the left machine body and the right machine body. A sinking opening is formed in the rear end of the working platform, and the bottom of the drill rod frame penetrates through the sinking opening to sink to a drill rod frame sinking area. The device is convenient to transport, small in size, flexible in drill site placement, high in adaptability to small drill sites and capable of meeting the actual requirements of the vast small and medium-sized coal mines.

The invention provides an underground coal mine drill site object detection model construction method and device, and the method comprises the steps: obtaining a training data set based on a coal mine data set; an improved YOLOv5 model is determined, the improved YOLOv5 model replaces a Focus structure in a backbone network with a common convolution structure, a Swish activation function is replaced with a Leaky ReLU activation function, and a self-adaptive anchor frame calculation module at an input end is replaced with a data self-adaptive anchor frame calculation module; training the improved YOLOv5 model through the training data set to obtain an initial detection model; and performing iterative processing including pruning, quantification and training on the initial detection model to obtain a coal mine underground drill site object detection model supporting DPU hardware deployment. A coal mine underground drill site object detection model with high accuracy and high recognition speed is obtained, and a target detection method supporting DPU hardware deployment and light weight is realized.

The application discloses a kind of steel pipe pile quick reinforcement device of slope near railway line, including vertical transmission rail installed on operation car, vertical transmission rail is installed with the walking mechanism that can walk along vertical direction, walking mechanism is connected with assembly seat through transverse telescopic arm, assembly seat is sequentially provided with slurry distribution mechanism, drill site adjusting mechanism and drilling transmission mechanism in vertical direction downward, drive mechanism is installed between assembly seat and drilling transmission mechanism, drilling transmission mechanism has multiple output units, clamping ring cutting mechanism is installed on each output unit, the upper end of steel pipe pile is clamped in clamping ring cutting mechanism.The application can reinforce the overall stability of the slope near railway line, effectively improve the overall stability of the slope, can greatly reduce the preparation conditions of construction site, reduce the occupation of road, reduce the influence of construction on surrounding environment, improve the efficiency of reinforcement.The application is suitable for the reinforcement of highway slope with sand-egg gravel soil filling.

The invention belongs to the technical field of coal mine roadway tunneling, and particularly relates to a rapid construction method for a bottom drainage roadway drill site based on cyclic operation. The front roadway of the bottom-drainage roadway is excavated to advance the drill site by less than three rows, and the front roadway and the drill site are synchronously excavated by a unit; the following cyclic operation mode is adopted for main roadway tunneling and drill site construction: main roadway tunneling, supporting, reverse cutting of a drill site, drill site supporting and returning to main roadway tunneling; seamless connection of the main roadway and drill site construction is achieved through the circulation process; the traditional linear construction mode of first driving roadway and then drilling site is broken through, and the overall tunneling efficiency is improved through alternate circulation (the construction time of a single drilling site is shortened by 25%); through the circulation operation process, tunneling of the bottom drainage roadway and construction of the drill site can be efficiently and synchronously carried out.

The utility model discloses a quick drainage test device for accumulated water in a goaf. The quick drainage test device comprises an experimental tank; the fissure zone is arranged on the inner side of the experimental tank, and a caving zone is arranged on the lower surface of the fissure zone; the water-resisting layer is arranged on the lower surface of the caving zone, and an undulating supporting surface is arranged on the water-resisting layer; the rock layer is arranged on the lower surface of the water-resisting layer; according to the method, through a multi-coal-seam simulation experiment, a goaf accumulated water roadway capable of rapidly draining the previous horizontal water is designed at the lower part of a mined coal seam or among coal seams according to the fluctuation condition of a horizontal accumulated water bottom plate of a previous panel, a drainage test drill site is designed at the corresponding position of a low-lying area of a previous horizontal working face, and a plurality of upward drainage drill holes are formed in the drill site; the simulation system not only solves the problem of time-space contradiction between excavation and drainage of goaf water in the same level, but also provides a new way for rapid drainage of the goaf water and rapid production replacement.

A process for preparing an effluent water based drilling fluid is provided. The process comprises treating effluent water with a pre-determined amount of sodium carbonate and bactericide to obtain a base fluid. The effluent water is obtained by treating produced water generated during oil well drilling or by treating a drill site wastewater. The amount of sodium carbonate and bactericide added to the effluent water is determined based on an elemental analysis of the effluent water. The process further comprises adding one or more additives to the base fluid to obtain the effluent water-based drilling fluid.

The invention relates to a working face roof multi-drill-hole drainage and drainage amount monitoring optimization design method, and belongs to the technical field of coal mine hydrological monitoring, and the method comprises the following steps: after the construction of a first drill site is completed, collecting the final hole water inflow of each drill hole, and calculating the water inflow of the first drill site and the cumulative proportion of each drill hole; calculating a variable coefficient of the water inflow of the first drill site; the drill holes of the first drill site are classified, and the drill holes needing to be monitored are screened; after the kth drill site is newly added, collecting the final hole water inflow of the drill holes in the current construction drill site, and calculating the water inflow of each kth drill site and the accumulated proportion of each drill site; calculating variable coefficients of the water inflow of all the current constructed drill sites; the drill sites are divided into a class I, a class II and a class III; calculating an accumulated proportion and a variable coefficient of all current constructed I-type drill site drill holes; all the drilled holes of the constructed I-type drill sites are classified, and the drilled holes needing to be monitored are screened; and repeating the steps until the construction is finished.

The invention discloses a coal mine high-extraction drilling site drill hole gas extraction measuring and monitoring device, and belongs to the related field of coal mining technology.The coal mine high-extraction drilling site drill hole gas extraction measuring and monitoring device comprises an extraction device, a main rod body and a combined rod, the main rod body is mounted in the middle of the outer surface of the upper end of the extraction device in a spliced mode, and the combined rod is mounted at the upper end of the main rod body in a spliced mode; the outer surface of the main rod body and the outer surface of the combined rod are driven by the lifters, the extraction device comprises an upper conical cap, an extraction tank and a lower conical cap, the upper conical cap is fixedly installed on the outer surface of the lower end of the extraction tank, the lower conical cap is fixedly installed on the outer surface of the upper end of the extraction tank, and threaded rings are arranged at the end of the lower conical cap and the end of the upper conical cap. A piston is movably installed in the extraction tank, and the bottom of the lower conical cap is of a conical structure. The gas extraction device can be flexibly applied to gas extraction operation of drill holes of any depth, the operation difficulty is reduced, and the detection extraction efficiency is improved.

The invention discloses a method for injecting hot flue gas to displace gas through kilometer directional drilling, which belongs to the technical field of gas treatment and comprises the following steps: A, drilling construction and drilling arrangement; b, arranging a hot flue gas injection system, a coal bed gas extraction system and a nitrogen injection system; c, arranging a monitoring system; d, performing first-stage hot flue gas displacement and pre-extraction before mining; e, coal seam mining in the first stage; and F, injecting nitrogen into the goaf. According to the method, accurate control over the drilling track is achieved, and the drilling effectiveness and efficiency are improved; according to the method, the effective extraction distance of the drill hole is increased, so that the gas extraction amount of the drill hole is increased; according to the method, drill holes constructed in the fan-shaped drill site can uniformly cover the whole working face, the method has the advantages of high drilling efficiency, simultaneous use of multiple holes, concentrated extraction and the like, and the coal seam gas treatment effect can be remarkably improved; according to the method, the gas energy utilization rate is increased, the influence and damage to the environment are reduced, and the method has important significance on safe and efficient production of a coal mine.

The invention discloses a construction method suitable for comprehensive prevention and control of coal rock dynamic disasters, and relates to the technical field of coal mining. The < 11 > N construction method suitable for comprehensive prevention and control of coal rock dynamic disasters comprises the following steps that S1, the position of a to-be-presplit coal rock layer is determined; s2, determining the position of a drill site; s3, determining a drilling position and a plurality of corresponding pre-splitting paths of the drilled hole in the coal rock layer to be pre-split; s4, directional long drilling construction is carried out, and horizontal long drilling is carried out on the to-be-presplit coal rock layer; s5, horizontal long drilling directional cutting operation is carried out; s6, retreating type segmented presplitting is carried out; and S7, the step S4 to the step S6 are repeated, and pre-splitting operation of the multiple pre-splitting paths in the to-be-pre-split coal rock layer is completed. According to the < 11 > N construction method suitable for comprehensive prevention and control of coal rock dynamic disasters, all-directional comprehensive treatment of coal rock layers can be achieved, large-range presplitting operation is carried out, the pressure relief and anti-reflection effects of presplitting cracks are guaranteed, and safe production of coal mine operation is guaranteed.

The invention provides a digital surrounding rock coring device and method matched with an advanced horizontal driller, the digital surrounding rock coring device matched with the advanced horizontal driller comprises a camera shooting acquisition device, one end of the camera shooting acquisition device is provided with a tensile cable used for power supply and data transmission of the camera shooting acquisition device, and the other end of the camera shooting acquisition device is provided with a data transmission device. A control device is connected to one end, deviating from the camera shooting acquisition device, of the tensile cable; the application scene of the digital surrounding rock coring equipment matched with the advanced horizontal drill is that the advanced horizontal drill site is constructed on a tunnel construction face, digital coring is carried out through the camera shooting collecting device 1, the coring difficulty and the working intensity of surrounding rock coring are reduced, and the digital surrounding rock coring equipment is suitable for horizontal drilling of different drilling diameters and geological working conditions; through a digital surrounding rock coring method, a corresponding relation between advanced horizontal drilling footage and digital surrounding rock is established, a digital surrounding rock database of the whole tunnel is established, and control, study and judgment of geological data are enhanced.

The invention relates to an emergency drilling plotting method based on personnel positioning, which belongs to the technical field of emergency drilling and comprises a data acquisition step, a time axis establishment step and a drilling plotting step. Obtaining multi-modal data in the drilling scene, and establishing time association between the multi-modal data and a preset drilling script; establishing a time axis according to the drilling script and the multi-modal data, and marking event information in the drilling script and event information in the drilling site in the time axis according to a time sequence; the exercise script and the multi-modal data are plotted on the map according to the time axis on the basis of the time dimension, the personnel dimension and the action dimension to obtain exercise plotting data, dynamic visualization of the exercise process is achieved by integrating the multi-modal data and the preset exercise script and establishing time association, the structuralization degree of the exercise data is improved, and the exercise efficiency is improved. Based on three-dimensional plotting of time, personnel and actions of a map, the drilling dynamic state can be visually displayed, and the standardization and controllability of drilling are enhanced.

The invention discloses an extremely complex coal seam accurate pressure relief and permeability increasing rapid coal uncovering method, which comprises the following steps of: constructing a crossing hole in a gas control roadway as a main area outburst prevention measure, constructing a bedding hole and a mechanical cave-making hole in a main haulage roadway drill site to carry out accurate pressure relief and permeability increasing gas control on a coal seam, and carrying out fixed-point hole sealing and accurate pre-pumping on the mechanical cave-making hole. A coal uncovering area is controlled through an omnibearing gridding outburst prevention measure which takes mechanical cave forming as a main part, takes layer penetrating drilling as an auxiliary part and takes precise pressure relief and permeability improvement, the targets of zero overrun and zero early warning are achieved in the coal uncovering period, and rapid and safe coal uncovering is ensured.

1. Name of the product in this design: Borehole gas pressure monitoring equipment. 2. Purpose of this design: This design is used to monitor the gas pressure at drilling sites. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present invention is applicable to the field of geological exploration technology and provides a method and system for constructing a three-dimensional geological model, comprising the following steps: collecting remote sensing images and DEM data, dividing the spatial area corresponding to the remote sensing images and DEM data into a number of blocks using an initial grid; extracting remote sensing feature information from the remote sensing images, determining a landform type map, and determining landform type information for each block; determining terrain factor information for each block based on the DEM data; calculating a geological complexity index for each block based on the landform type information and the terrain factor information, and determining candidate drilling sites based on the initial grid and the geological complexity index; adjusting the positions of the candidate drilling sites based on landform edge lines, and obtaining drilling data based on the drilling sites; and establishing a three-dimensional geological model based on the remote sensing images, DEM data, and drilling data. The present invention can accurately assess geological complexity, make the distribution of drilling sites more reasonable, and provide more reliable data support.

The invention focuses on the technical field of coal mine goaf fire prevention and extinguishment, and provides a goaf fire prevention and extinguishment method and system based on advanced drilling and solid (liquid) state carbon dioxide filling aiming at the problems of high cost, poor effect, environmental pollution and the like of the existing fire prevention and extinguishment technologies such as nitrogen injection, grouting and stopping agents. According to the method, high-position drill sites are arranged on an air inlet way or an air return way of a coal face every 10-50 m, holes are drilled in a coal seam roof according to factors such as roof lithology and coal seam conditions, and then solid or liquid carbon dioxide is selected for filling or pouring. Along with coal mining propulsion, the filled or poured solid (liquid) carbon dioxide is gasified to form a gas wall to isolate oxygen, and meanwhile, a low-temperature area is created through gasification and heat absorption, so that spontaneous combustion of coal is inhibited. The system covers drilling construction, solid carbon dioxide filling, liquid carbon dioxide pouring and fire prevention and extinguishing monitoring and control assemblies. Based on theoretical research and early-stage simulation, the method is expected to be capable of efficiently preventing and extinguishing fire, reducing cost, being simple and convenient to operate, environmentally friendly and high in adaptability, and is expected to provide an innovative and efficient solution for preventing and extinguishing fire in a coal mine goaf and promote development of a coal mine safety production technology.

The present application relates to the technical field of mine area treatment, in particular to a method for treating room-and-pillar type goaf, which comprises: arranging a water pumping drill site and a grouting drill site on the room-and-pillar type goaf, the grouting drill site and the water pumping drill site corresponding to the goaf space; respectively performing drilling at the water pumping drill site and the grouting drill site to obtain a water pumping hole and a grouting hole communicating with the goaf space; injecting hardenable slurry into the goaf space through the grouting hole, while pumping out underground water in the goaf space through the water pumping hole; after the slurry hardens, arranging a monitoring drill site on the room-and-pillar type goaf and performing drilling at the monitoring drill site to obtain a monitoring hole for observing the filling rate of the slurry, the monitoring hole communicating with the goaf space. The method for treating room-and-pillar type goaf can improve the stability of the room-and-pillar type goaf and avoid the collapse of the room-and-pillar type goaf.

The invention relates to a method for preventing and controlling rock burst of a main roadway group by axial kerf fracturing in a horizontal hole of a roof, which comprises the following steps of: determining a thick hard sandstone layer covered on a coal seam as a pressure relief target layer according to a drill hole histogram of the main roadway group, and tunneling a pressure relief measure roadway in the pressure relief target layer; a drill site is arranged on the pressure relief measure roadway, a pressure relief hole is drilled, a plurality of pressure relief seams are cut in the axial direction of the pressure relief hole, and hydraulic fracturing is carried out on the pressure relief seams to form fractures; and repeating and forming a fracture area, and covering the main roadway group by the projection surface of the pressure relief area on the coal seam in the vertical direction. According to the method for preventing and controlling the rock burst of the main roadway group through axial kerf fracturing in the horizontal hole of the top plate, dense kerf fracturing is carried out on the rock stratum above the main roadway group, so that the overlying rock stratum of the main roadway group is integrally weakened, the self-weight stress and the tectonic stress level above the main roadway group are reduced, the main roadway group is located in a low-stress area, and the rock burst of the main roadway group is prevented. Therefore, safe use of the main roadway in a low-stress area is achieved, and the stress concentration degree and the impact danger during the use of the main roadway are greatly reduced.

The invention discloses a coal, heat and gas co-mining method based on gangue throwing and grouting combined filling, which comprises the following steps of: firstly, carrying out roadway-by-roadway filling mining on a lower group of coal, paving glass fiber felt cloth on a roadway top plate and installing a grouting pipeline before filling; coal seam mining and heat collection system installation are achieved in the modes of segmented gangue throwing, heat collection pipeline installation and connection, gangue throwing roof contact and grouting. The heat collection system takes mine water as a heat storage medium, after being heated, the mine water is conveyed to an upper group coal gas extraction drill site through a flow conveying pipeline and enters a drilling machine, and the drilling machine drills through hot water so as to improve the gas pre-extraction efficiency; coal slag and sewage generated by drilling are subjected to slag-water separation and purification treatment and then flow back to the next group of coal heating system to be heated for cyclic utilization. After all the drill holes in the drill site are formed, a plurality of holes are selected as heat injection holes, heated mine water is changed into hot steam through a steam generator to be conveyed to the heat injection holes to heat a coal body, and after the coal body is heated, gas drainage is carried out through a gas extraction hole.