1213results about "Underground mining" patented technology

The invention provides a hydraulic fracturing fracture net distribution form near-field monitoring method, which comprises the following steps of: arranging a plurality of roof monitoring holes in roadways on two sides of an underground coal mine working surface, installing electromagnetic signal sensors in each roof monitoring hole and on anchor rods of roadway stoping sides, and constructing a full-space monitoring network covering a hydraulic fracturing layer; a data interpretation processing module of the electromagnetic signal time-shifting imaging analysis system comprises a multi-field coupling mathematical model for analyzing and deducing real-time imaging of electromagnetic signals; in the hydraulic fracturing process, an electromagnetic signal sensor is used for monitoring a current field, an electromagnetic field and an ion diffusion field in the rock mass fracture development and expansion process, a monitoring result is substituted into an electromagnetic signal time-shifting imaging analysis system for calculation and feature value extraction, and the fracture net distribution form is deduced through the feature value. According to the invention, the expansion path of the fracturing fluid in the rock stratum can be monitored in real time, the three-dimensional distribution form of the hydraulic fracturing fracture network can be inverted, and a new technical support is provided for the inspection of the hydraulic fracturing pressure relief effect of the underground coal mine.

The invention relates to the technical field of evaluation and real-time optimization systems, and discloses a deep fluidized mining dynamic disaster prevention and control effect intelligent evaluation and real-time optimization system which comprises a data acquisition module used for acquiring monitoring data in real time through a multi-source sensor network arranged in a stope, a fluidized medium and surrounding rock, and an intelligent analysis module used for analyzing the monitoring data in real time. And the construction module is used for constructing a comprehensive evaluation index system comprising a statics index, a dynamics index and a stability index based on the monitoring data. The intelligent evaluation and real-time optimization system for the dynamic disaster prevention and control effect of deep fluidized mining breaks through the limitation of traditional single index evaluation, constructs a comprehensive evaluation index system covering statics, dynamics and stability by integrating stress, microseismic, acoustic emission, displacement and other multi-source sensor networks, and improves the dynamic disaster prevention and control effect of deep fluidized mining. A deep learning model is used for carrying out fusion analysis on mass heterogeneous data, and multi-dimensional precursor information of disaster inoculation can be disclosed.

The invention discloses an intelligent collaborative supporting and recycling method for residual mining of special-shaped pillars in a limited space, and belongs to the technical field of mining engineering. According to the method, an intelligent closed-loop system of sensing, decision-making, execution and feedback is constructed aiming at the problems of narrow space, complicated stress, high safety risk and the like faced by special-shaped ore pillar recovery in a limited space. The method comprises the following steps: firstly, constructing a dynamic digital twinborn model by using LiDAR and GPR fusion detection; secondly, performing stoping-supporting collaborative optimization design based on numerical simulation and an AI algorithm; then, low-disturbance blasting and micro intelligent equipment are adopted for precise subsection stoping; the mining-supporting-filling cycle operation is synchronously implemented, and an artificial key layer is quickly constructed by using a quick-setting expansion material; and finally, multi-stage intelligent early warning and dynamic regulation and control are realized through a multi-element sensor network. According to the method, the recovery rate of residual ore resources can be remarkably increased to 90% or above, ground pressure disasters are effectively controlled, and green, safe and efficient recovery of mine resources is achieved.

The invention discloses a drilling and cutting head, a drilling and cutting device, a gob-side entry retaining slotting method and a roof cutting pressure relief method, and belongs to the technical field of mine drilling and cutting. The drilling and cutting head comprises a vehicle body, a drilling rod and the drilling and cutting head, and the vehicle body is rotationally provided with a drilling rod conveying driving mechanism through a connecting base and a rotary table; a water cutting system is further installed on the vehicle body. The drilling and cutting head comprises a mounting seat, a plurality of drill bit seats and drill bit blocks, an inner cavity is formed in one end of the mounting seat, and mounting holes are formed in the side wall of the mounting seat; a spray hole is formed in the middle of the spray head. And the end part of the inner cavity of the drilling and cutting head is connected with the head drill rod. Through one device, two operation procedures of drilling and water cutting can be achieved, high efficiency of the gob-side entry retaining slotting method and the top cutting pressure relief method can be achieved, the device cost is effectively reduced, the device can be flexibly and conveniently used in a roadway, the operation efficiency is effectively improved, and the device cost is reduced.

The invention discloses a deep mine rockburst risk grading early warning and active pressure relief system and method, and relates to the technical field of rockburst risk early warning. The system comprises a multi-source parameter sensing module, a risk grading early warning module, an active pressure relief execution module, an intelligent control center module and a data storage and interaction module, wherein the multi-source sensing module comprises a distributed sensor and a mobile inspection robot; risk early warning is divided into four levels, and sensitive features are extracted after data are preprocessed; active pressure relief comprises fixed-point and regional pressure relief equipment; the control center uses a redundant architecture to automatically match a pressure relief scheme; and data storage retains more than or equal to 5 years of data, and multi-system docking is supported. The rock burst early warning accuracy and the pressure relief pertinence are improved, multi-module closed-loop cooperation is achieved, emergency response is efficient, false alarm, missing alarm and pressure relief blindness are reduced, roadway stability and personnel safety are guaranteed, and support is provided for safe and efficient mining of deep mines.

The invention discloses a filling mining method based on stage reverse medium-length hole groove broaching, which relates to the technical field of mining, and comprises the following steps: stope structure parameter design, mining preparation engineering construction, cutting engineering, stoping process and filling process are carried out in sequence, the cutting project comprises the steps of cutting courtyard rapid forming, cutting groove broaching and cutting groove rapid penetrating; and the cutting courtyard is rapidly formed by adopting a laser pre-splitting auxiliary blasting process. According to the method, the cutting and groove broaching processes are deeply optimized, so that the overall efficiency of underground mining is remarkably improved. In the cutting courtyard forming stage, the laser presplitting auxiliary blasting technology is introduced, so that the rock integrity is reduced, the blasting energy is more concentrated, the effect is more accurate, the problems of perforation, rock slag squeezing and the like in the traditional process are effectively avoided, the explosive loading amount can be reduced, disturbance of blasting vibration to surrounding rock is reduced, and the blasting quality is improved. And a safer technical support is provided for high-stress ore body mining.

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 relates to the technical field of underground mining of metal ore deposits, in particular to a staged ascending pillar-free large-diameter deep-hole lateral caving subsequent filling mining method, which comprises the following steps of: dividing a steeply inclined medium-thickness ore body into a plurality of stages, and dividing large and small stopes in the stages without leaving pillars; digging a flat-bottom ore removal structure at the bottom of the stope, and digging a rock drilling chamber at the bottom of the stope at the upper stage; digging a cutting well at the end part of the stope and expanding the cutting well into a cutting groove; large-diameter parallel deep holes are drilled downwards in the rock drilling chamber, and lateral ore caving is carried out with cutting grooves as free faces; the caved ore is transported out by a carry-scraper through the flat-bottom ore removal structure; and the stope goaf is subjected to subsequent cemented filling. The small stopes are firstly stoped and filled with the 1: 4 full-tailing cementing material, and after the small stopes are solidified, the large stopes are stoped and filled with the 1: 20 full-tailing cementing material. The method has the characteristic of ascending stoping among stages, and has the advantages that pillar-free continuous stoping is realized, and the rock drilling chamber is used as a flat bottom ore removal structure to be reused.

The invention discloses a coal mining water retention method, which comprises the following steps of: pre-calculating the height h0 of a water flowing fissure zone in a deep aquifer when the water yield Q2 of a coal mining mine is equal to the total water consumption Q1 of production and life of a mining area, and then calculating the corresponding mining height M0 when a coal seam below is mined according to the height h0 of the water flowing fissure zone; according to the mining height M0, the filling height M2 needing to be equivalently filled in the goaf is calculated, and materials are filled into the goaf behind along with advancing of the coal face during coal mining until the materials reach the height of M2, so that too high or too low development of the water flowing fissure zone can be inhibited, the filling height or thickness can be reduced, and the filling efficiency is improved. According to the method, the balance between the filling height of the goaf and the development height of the water flowing fractured zone is found in an equivalent filling mode, mine water generated during coal mining can meet the total water consumption of production and life of a mining area, the defects caused by complete filling can be avoided, the coal mining efficiency is improved, and the water retention effect is also improved.

The invention provides a downward parallel medium-length hole sublevel filling mining method for a low-grade broken ore body, belongs to the technical field of mining, and solves the problems that a traditional mining method is low in mining efficiency and high in cost under complex geological conditions. Downward parallel medium-length holes are adopted in each section for drilling and blasting, efficient stoping is achieved in cooperation with remote control ore removal and supporting equipment, an interbed filling technology is adopted in a goaf to be combined with a reinforcing mesh structure to form an artificial roof, stress and displacement changes of a filling body are monitored in real time through a ground pressure monitoring system, and the stoping sequence and supporting parameters are optimized. According to the method, the efficiency and safety problems of a traditional mining method in low-grade and broken ore deposit and three-under resource mining are solved, large-scale, low-cost, safe and efficient mining is achieved, and the method is suitable for ore body mining under complex geological conditions.

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 an underground mine goaf filling body strengthening and subsequent mining joining method, and relates to the technical field of mine mining. Comprising the following steps of intelligent filling body construction and reinforcement, multi-source fusion intelligent monitoring and digital twinning construction, data-driven subsequent mining dynamic intelligent decision making and energy regulation and control, targeted restoration and collaborative ecological reconstruction. The intelligent filling body is made of the shape memory polymer fibers and the nanometer piezoelectric ceramic particles, the layering process is combined to improve the strength and real-time state feedback, the safety and durability of the filling body are remarkably improved, the high-fidelity digital twinborn model is constructed in a fused mode, intelligent decision making and active wave absorbing regulation are linked, and the stability of the filling body is improved. The subsequent mining efficiency can be effectively improved, the damage risk of the filling body can be effectively reduced, in addition, the damage area is accurately positioned through the unmanned aerial vehicle, directional grouting repair is conducted, heavy metal is solidified through microorganisms, solid waste is recycled, the resource utilization rate in the mining process is increased, and the environmental burden is 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 discloses a short-distance multi-ore-bed potassic salt ore large-section long-strip comprehensive mechanized mining method, and belongs to the technical field of potassic salt ore deposit mining. The method comprises the steps that a centralized transportation roadway is arranged on an upper head mining layer, an auxiliary transportation roadway is arranged in a stable salt rock interlayer between ore layers, and combined development is achieved; arranging large-section long strip chambers in the ore blocks along the inclination direction, and reserving permanent spacing strip pillars to maintain the stope to be stable; a chamber is cut and formed at a time by a double-arm large-mining-height mining machine, and efficient stoping is realized by matching with a continuous transportation system; multiple ore beds are mined in a coordinated mode from top to bottom in sequence, and the ore block air return way and the ore block air return way of the upper ore bed are staggered by 20 m or above so as to avoid stress superposition; a full-air-pressure ventilation system combining a press-in type and a draw-out type is constructed; natural supporting is achieved through permanent spacing strip pillars and natural top and bottom plates, safety is guaranteed through a micro-seismic and top plate monitoring system, and the goaf is backfilled with tail salt slurry to achieve green mining. According to the method, safe, efficient and high-recovery-rate mining of the short-distance multi-ore-bed sylvite ore is achieved.

The present application belongs to the field of phosphate mining, and particularly relates to a method for mining a steeply inclined phosphate deposit without leaving a top and bottom pillar; the method comprises the following steps: dividing the phosphate layer in a mining section into several stages from bottom to top along the inclination, constructing a stage transport main in the lower part of each stage, and using the stage transport main of the previous stage as the stage auxiliary transport main of the next stage without leaving a bottom pillar and a top pillar; constructing an air return crosscut in the upper part of the uppermost stage from the air shaft, and then excavating an air return shaft from the air return crosscut downward along the inclination of the phosphate layer to connect with the stage auxiliary transport main and the stage transport main; arranging strip blocks along the strike on both wings of the stage to perform skip mining, first mining the odd strip blocks and filling them, and then mining the even strip blocks, the size of the strip blocks being determined according to the strength of the roof and floor, and no inter-pillar being left between the strip blocks; and thus mining all the stages from bottom to top. The present application greatly reduces the leaving of pillars and improves the resource recovery rate of one stoping.

The present application belongs to the field of phosphorite deposit mining technology, and particularly relates to a method for recovering a phosphorite layer bottom pillar under a filling body, which comprises arranging a segmented transport roadway in a sandwich in the top and bottom surface of the bottom pillar to reduce the construction engineering quantity of the rock drilling roadway and the ore roadway; first constructing a filling roadway intersecting on both sides of the segmented transport roadway, filling the filling body roadway with high-strength filling material, and then constructing the segmented transport roadway in the filling roadway, so that the segmented transport roadway is finally topped and bottomed with the sandwich rock, and both sides of the segmented transport roadway are high-strength filling bodies, which greatly improves the strength of the segmented transport roadway and reduces the influence of ore mining. Further, the present application proposes an invention point of leaving a permanent ore pillar in the ore body on one side of the sandwich bottom plate to improve the safety of the segmented transport roadway and the ore room mining; in order to further improve the safety of the ore room mining, the present application first proposes an ore room adopting an eight-character-shaped stope structure.

The invention relates to the technical field of mine filling and reinforcing, in particular to a grouting device for filling and reinforcing a goaf, which comprises a grouting pump, a grouting pipe and plugging pieces, the grouting pipe is provided with a grout outlet, a sliding column is arranged in the grouting pipe, the plugging pieces are arranged above and below the grout outlet, and each plugging piece comprises a seat body and a plugging bag. A first annular groove is formed in the outer wall of each seat body in a concave mode, each blocking bag comprises outer bag cloth and inner bag cloth which are coaxial with the corresponding first annular groove, a first closed filling cavity is formed between the inner bag cloth and the inner wall of the corresponding first annular groove, the first filling cavities in the two seat bodies are communicated through a second pipeline, and a second annular closed filling cavity is formed between the inner bag cloth and the outer bag cloth. The second filling cavities in the two base bodies are communicated through a third pipeline, a liquid storage cavity is formed in the base body below the grout outlet, and a sliding block is connected into the liquid storage cavity in a sealed and sliding mode in the radial direction of the grouting pipe. According to the scheme, the deformation resistance of the whole plugging bag is higher, leakage of the filling slurry can be effectively prevented, and the diffusion degree of the filling slurry in rock stratum cracks above the goaf is improved.

The invention discloses a ground directional drilling goaf passing leaking stoppage method which comprises the steps that hole data of a goaf are obtained, and the hole data comprise the hole depth and the crack width; when the width of the crack is larger than 5 mm, a foundation plugging material is adopted for conducting foundation plugging on the hole of the goaf, and the foundation plugging material is an inert material and cement paste; judging whether basic plugging fails or not to obtain a first judgment result; if the first judgment result shows that the basic plugging fails, a flexible plugging material is adopted for conducting medium-term plugging on the holes in the goaf, and the flexible plugging material is a material formed by mixing hemp fiber, sawdust, soybeans and water. According to foundation plugging, a large channel is filled through particle bridging, a primary plugging layer is formed after cement paste is solidified, the flexible material can adapt to trace deformation of surrounding rock through deformation filling, and micro cracks of a foundation layer are plugged. Through graded gradient filling, the leaking stoppage effect can be greatly improved.

The invention discloses a fracturing control method for tunneling roadway surrounding rocks in a near-distance coal seam excavation working area, which comprises the following steps of: calculating a working area stress superposition influence range when near-distance coal seam excavation is performed oppositely, and arranging fracturing drill holes to carry out fracturing stress transfer on a top plate and an interlayer hard rock stratum in the excavation working area. In the excavation drift stress superposition influence range, an overlying hard roof is cut off through fracturing of an upper coal seam working face mining roadway, the weighting step pitch and weighting strength of roof fracture are reduced, and the mining-induced stress transmitted to a lower coal seam tunneling roadway is reduced; the interlayer hard rock stratum is fractured and cut off in the lower coal seam track high drainage roadway to block stress transfer, mining-induced stress superposition of upper coal seam working face stoping and lower coal seam roadway tunneling is weakened, and the stress concentration degree of a mining drift area is reduced. According to the method, the influence of mining-induced stress superposition in a near-distance coal seam mining intersection area on lower coal seam roadway tunneling and upper coal seam working face mining roadway is reduced, and normal mining of an upper coal seam working face and normal tunneling of a lower coal seam working face roadway are guaranteed.

A method of analysing ore, wherein the method includes, during excavation, scanning / sensing ore, by using a sensor. The sensor is located at a position which is (i) spaced from a bucket / shovel of an excavator and (ii) operatively higher relative to the bucket / shovel. The sensor is also directed towards the bucket / shovel, so that the sensor can scan / sense operatively downwardly towards / into the bucket / shovel. The sensor may be secured to, or mounted on, an excavator at a position which is spaced from a bucket / shovel of the excavator.

The invention relates to a mining overlying strata separation layer fracture ground self-adaptive grouting method, and belongs to the technical field of coal mine rock burst prevention and green coal mining, and the method comprises the following steps: S1, determining the spatial positions of an overlying strata key layer and a subkey layer where the overlying strata generates a separation layer fracture according to the thickness, the physical and mechanical properties and the position of the overlying strata; s2, according to the coal mining thickness and speed, the spatial change rate and distribution of separation fractures of a main key layer and a sub-key layer of the overlying strata are determined, the layer position where ground grouting holes are distributed is pre-judged in advance, and corresponding grouting holes are constructed; s3, the grouting rate is determined according to the spatial change rate of the separation fractures, and the minimum stress of splitting damage of rock stratums adjacent to the separation fractures is calculated in sequence to determine the maximum grouting pressure; and S4, the overall pressure and flow are adjusted in a self-adaptive mode according to the real-time feedback of the pressure and flow of the multiple grouting holes, and the separation layer space is filled in real time.

The invention provides an open-pit mine multi-step space-time cooperative efficient mining method, and relates to the technical field of open-pit mine mining, and the method comprises the following four steps: constructing a dynamic three-dimensional geologic model based on multi-source data, carrying out multi-step space-time cooperative pre-planning, carrying out multi-step dynamic scheduling and cross-operation cooperation, and carrying out multi-parameter coupling grading early warning. According to the method, real-time mapping of a physical mine and a virtual model is realized by integrating total element data of geology, equipment and environment through a digital twin platform, further, real-time problems such as equipment conflicts and road closing are solved through pre-planning and optimizing step space layout and time sequence and dynamic scheduling, efficient operation of main mining equipment can be guaranteed, and the real-time performance of the main mining equipment is improved. Then a multi-parameter coupling grading early warning mechanism is introduced, key indexes such as slope stability and dust concentration are monitored in real time, the accident risk is reduced through grading response, and multiple targets of improving the working efficiency, reducing the operation cost, controlling the safety risk and flexibly utilizing resources can be achieved.

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 relates to an upward horizontal layering full barren rock filling mining method for a multi-layer parallel steep dip ore body, which comprises the following steps of: panel division: dividing the ore body into a plurality of middle sections, segmenting and layering, dividing each middle section into a plurality of panels along the trend of the ore body, and further dividing each panel into a plurality of stoping units from an upper panel to a lower panel; performing mining preparation roadway arrangement and cutting engineering: performing roadway arrangement by taking outside-vein mining preparation as a main part in the mining preparation engineering, so as to form a mining ore removal channel and a ventilation system; the cutting project is a cutting roadway. And stoping and filling are conducted, specifically, stoping is conducted layer by layer from bottom to top in each panel, stoping is conducted one by one from the upper panel to the lower panel through the stoping units of the same layer, and stoping and filling of the upper layer are started after stoping and filling of the layer are completed. Through the technical means of panel division, accurate mining roadway arrangement, mining and filling circulation collaborative operation, full barren rock filling and the like, the production efficiency of the mine is remarkably improved, and the filling cost is reduced.

The invention discloses a method for mining and supporting a downward inverted trapezoidal long drift of a steeply inclined thin vein, and belongs to the technical field of mine engineering. A horizontally arranged main connection way is used as a shared connection way of other layers in a section, so that an opening area of the connection way of the next layer is located in the connection way of the previous layer, and meanwhile, the opening position is controlled; projections of all the openings on the main connection way are not overlapped, and projections of all the layered connection ways in the vertical direction are not completely overlapped. For the non-adjacent stopes, the opening of the connection way is arranged in the adjacent layered connection way closest to the main connection way, so that the repeated tunneling workload is reduced through roadway sharing, the engineering construction cost is directly reduced, and the construction period is directly shortened; meanwhile, by means of the design that the staggered openings and the vertical projection are not completely overlapped, the situation that all the layered connection ways form continuous empty areas in the vertical direction is avoided, surrounding rock stress is dispersed, and the problem that in the prior art, surrounding rock is broken due to stress superposition is solved.

The application discloses a coal rock anti-burst method of large-range seam forming by remote controllable shock wave and hydraulic fracturing, and comprises the following steps: step one, detecting and recording the stress concentration degree of target coal seam or rock stratum; step two, drilling; step three, withdrawing the hollow drill rod, arranging the discharge electrode connected with the cable at the front end of the hollow drill rod, and sending the discharge electrode into the drill hole through the hollow drill rod; step four, sealing the hole by using a hole sealer and performing hydraulic fracturing; steps five to seven, completing multiple repeated electric pulse discharge operations; and step eight, testing the pressure relief effect of the coal seam or rock stratum. The method uses the drilling cuttings method, high-pressure hydraulic fracturing and high-voltage electric pulse to perform large-range cracking and pressure relief on the coal rock stratum, changes the stress state of the coal rock stratum, and reduces the stress concentration degree, so that the anti-burst purpose is achieved. The method is mainly applied to deep coal rock body tunneling roadways and coal mining working faces containing coal rock body impact tendency.

The invention belongs to the technical field of overlying strata directional presplitting, and particularly discloses and provides a fully mechanized caving face peripheral overlying strata directional presplitting analysis method which comprises the steps that a benchmark presplitting path is generated by building a three-dimensional geologic model, initial drilling points are arranged, and near, middle and far influence areas are divided; pre-splitting is simulated, mechanical parameters are collected to judge whether overlying strata weakening reaches the standard or not, for substandard path sections, drilling point coordinates are optimized, paths are reconstructed, after repeated optimization is conducted till all areas reach the standard, drilling azimuth angles and inclination angles are determined, and finally directional pre-splitting is executed; according to the method, the three-dimensional geologic model is constructed to generate the reference pre-splitting path, the drilling points are arranged, the path is analyzed and optimized in combination with three-level regional mechanical parameters, the problems that the path is not matched with geological conditions and coverage is incomplete are solved, meanwhile, the drilling parameters are accurately matched with the target region by dynamically adapting the azimuth angle and optimizing the dip angle, and the accuracy of the drilling is improved. And efficient release of pre-splitting energy is ensured, and the directional pre-splitting precision and efficiency are improved.

The invention discloses a coal mining equipment state sensing method based on large model and digital twinning, which relates to the technical field of state sensing, and comprises the following steps: inputting a multi-modal data set into a quantum convolution encoder, carrying out feature compression through a quantum state superposition principle, selecting key feature fragments by utilizing an attention gating mechanism, and carrying out feature compression on the key feature fragments; generating a multi-scale digital twin of the device; according to the multi-scale digital twins, a space-time diagram Transform network is used for establishing a dynamic correlation model between equipment parts, the interaction intensity between the parts is quantified through a diagram attention mechanism, the equipment state evolution process is described through a neural differential equation, and an equipment state evolution model is obtained; combining the equipment state evolution model with the generative adversarial network, and simulating an equipment degradation path through a generator; according to the method, key dynamic fragments are adaptively screened through an attention gating mechanism, the classic convolution serial bottleneck and fixed attention rule limitation are broken through, exponential-level dimension reduction is achieved, and a degeneration-related space-time mode is accurately captured.

The invention discloses a digital twinborn simulation optimization system and method for mining dilution rate and loss rate, relates to the technical field of digital mines, and solves the problem of isolated operation of geology, production and automation subsystems in a traditional system by fusing a geologic model and a production model in a unified platform. And an integrated intelligent system with data intercommunication and business collaboration is formed. And the management of the dilution rate and the loss rate is changed from the traditional post statistics to the instantaneous perception and the abnormal diagnosis based on the real-time data, so that the online monitoring and the active intervention of the production process are realized, and the resource waste is reduced. Parallel deduction and multi-objective optimization are carried out on multiple schemes through a simulation engine, and a global optimal scientific decision scheme under multiple objectives can be provided. Through real-time feedback of an execution result, the twin mining area model is continuously calibrated and optimized, the defect that the precision of a traditional static model is attenuated along with time is overcome, and a reliable basis is provided for long-term optimization.

The invention provides a safe and efficient combined mining method for a near-surface thick and large low-grade ore body under a broken ore rock condition, and belongs to the field of mining. The first-step stope adopts a downward large-diameter deep hole subsequent filling method, horizontal and vertical anchor cable holes are constructed in a drilling chamber at the top of the stope, and the vertical anchor cable holes are communicated with the ground surface; a subsection medium-length hole subsequent filling mining method is adopted in the stope in the second step, and downward anchor cable holes are constructed in the earth surface above the stope to the boundary of the ore body; after cement mortar is injected into the anchor cable holes, orifice anchor cables are connected in series, prestress is applied, and a combined anchor cable supporting system is formed; filling immediately after the stope is mined in the first step; and after the filling body reaches the preset strength, filling after mining is carried out on the second-step stope. Through application of the combined supporting structure and the mining technology, near-surface thick and large low-grade ore body resources can be safely and efficiently mined, underground occurrence resources are fully utilized, and continuous high-quality development of mine enterprises is guaranteed.