17results about How to "Safe and Efficient Mining" patented technology

The invention belongs to the technical field of coal mining, and discloses a working face initial mining period hydraulic fracturing top cutting drill hole arrangement method based on an asymmetric three-hinged arch structure so as to solve the technical problems existing in initial mining period hard top plate treatment in the prior art. Comprising the steps that the position of a key layer is judged, the fracture distance of a hard roof of a working face is judged, the horizontal position of an upper roof fracture is determined based on an asymmetric three-hinged arch structure, the vertical height, namely the caving height h, of a hydraulic fracturing cut roof is determined, and fracturing holes of conventional straight holes are constructed in a working face open-off cut and transportation roadways and return air on the two sides. Fracturing holes in the cut holes are constructed perpendicular to the coal wall, drilling construction is conducted through drilling equipment, and the steps of conventional drilling fracturing, directional long drilling fracturing and the like are conducted respectively. According to the method, the rock mass strength is reduced, mine pressure disasters caused by overall caving of the large-area suspended roof are effectively controlled, frame pressing and rock burst disasters are avoided, the respective advantages of a conventional straight hole and a directional hole phase are fully played, and a guarantee is provided for safe and efficient stoping.

The invention belongs to the technical field of coal mining and filling. In order to solve the problems of high mining and filling cost and large branch roadway supporting workload in the prior art, the strip branch roadway unmanned mining and filling method based on the remote control continuous mining machine is provided, the remote control continuous mining machine, coal transportation equipment and ventilation equipment are adopted in cooperation with remote control to complete coal transfer and ventilation, traditional branch roadway supporting is omitted, and the working efficiency is improved. Unmanned operation of the branch roadway is achieved, the workload of workers is reduced, the supporting time is shortened, the yield is increased, the cost is reduced, use of operators is reduced, the problem that due to space limitation, the opening position of the branch roadway is difficult to transfer and unload is solved, meanwhile, the requirement for the transportation volume can be met, safe and efficient mining is achieved, and the mining efficiency is improved. Through combination of single-side plugging and drilling filling, the workload of opening plugging and filling templates is reduced, the filling efficiency is improved, and hazards such as construction potential safety hazards, air flow short circuit or insufficient air quantity caused by branch roadway penetration are avoided.

The invention discloses a coal underground gasification mining front and rear furnace common well continuous coordination propulsion method which comprises the following steps: S1, constructing a gas inlet well and a gas outlet well of a first furnace, and performing gas injection fracturing on a gasification to-be-mined area of the first furnace by using the gas outlet well; s2, coal seam combustion gasification operation is conducted on the gasification to-be-mined area of the first furnace, and synthesis gas is collected through a gas outlet well of the first furnace; meanwhile, a gas outlet well of the second furnace is used for conducting gas injection fracturing on the gasification to-be-mined area of the second furnace; s3, the combustion space area of the first furnace is made to be idle for cooling, meanwhile, the second furnace conducts combustion gasification operation, and the third furnace conducts gas injection fracturing operation; each furnace is subjected to a flow process of gas injection fracturing, combustion gasification, idle cooling and CO2 storage well closing treatment; and S4, completing each flow process in sequence. The upper furnace and the lower furnace carry out difference node follow-up according to the flow process by one flow node, the upper furnace and the lower furnace carry out well sharing, the number of drilled wells is reduced, geological damage is relieved, and the mining efficiency is improved.

The invention discloses a coal underground combustion gasification and carbon dioxide sequestration mining treatment method. The method comprises the steps that S1, gas injection fracturing is conducted, specifically, fracturing gas is introduced through a gas outlet well to enable a coal seam corresponding to a gasification to-be-mined area to form a fracturing seam net; s2, combustion gasification: taking the bottom end of a gas inlet shaft of the furnace to mountain gas and the bottom end as a mining direction, discharging gas from the furnace, and discharging synthesis gas; and S3, sealing and closing the well: injecting carbon dioxide serving as displacement gas into the space to be sealed through the gas inlet well, collecting mixed gas through the gas outlet well, and then injecting high-pressure CO2 gas into the space to be sealed for sealing treatment. According to gas injection fracturing of a single furnace, a horizontal fracturing gas injection channel is adopted for carrying out gas injection fracturing treatment on the gasification to-be-mined area of the furnace located above to form a fracturing crack net, the upper furnace well and the lower furnace well can be jointly subjected to difference node follow-up according to the flow process and the difference of one flow node, and the sealing difficulty of the well and a combustion space area is reduced; and the mining efficiency is improved.

The invention discloses a method for optimizing the strength of a high-temperature metal mine filling mining cemented filling body. S1, obtaining a relational expression among the uniaxial compressive strength of the cemented filling body, the concentration and the cement-sand ratio; s2, obtaining a relational expression between the uniaxial compressive strength and the curing temperature; s3, constructing a mutual relationship among the uniaxial compressive strength of the cemented filling body, the curing temperature, the concentration and the cement-sand ratio; meanwhile, constructing a deep ore body three-dimensional numerical model; s4, dividing the ore body to be mined into ore chambers and ore pillars; s5, analyzing the stability of the stope; s6, a cemented filling body matching scheme meeting the strength requirement is obtained; s7, cost is reduced to the maximum extent under the condition that the safety condition is met; and S8, performing stope safety coefficient analysis and optimization calculation in the stoping process of the pillars with different mining depths according to the step S6, and obtaining optimal proportion parameters of the cemented filling body under different mining depth conditions. Mine production cost can be reduced to the maximum extent, and safe and efficient mining of the mine is achieved.

The invention relates to a test method and system for rapidly determining phase equilibrium conditions of gas hydrate in sediment, and the method comprises the following steps: S1, obtaining a relation curve of the gas pressure of the gas hydrate along with time change, and constructing a mathematical model; s2, selecting a gas pressure curve in a preset time period in the relation curve, fitting a change relation of gas pressure in the gas pressure curve by utilizing a mathematical model, and obtaining a unit temperature pressure release rate and characteristic time under the action of the corresponding reservoir temperature; s3, calculating the gas pressure intensity of the gas hydrate in an equilibrium state under the action of the reservoir temperature by utilizing the unit temperature pressure release rate and the characteristic time; and S4, repeating the steps S2-S3 until the gas pressure intensity when the gas hydrate is in a balanced state is equal to the initial gas pressure intensity. According to the invention, determination can be carried out without waiting for the sample to reach a balanced state, so that the test time is greatly shortened, and the problem of inaccurate gas pressure caused by the fact that methane gas in a high-pressure state is dissolved in unfrozen water is effectively avoided.

The present application relates to the field of data processing, and provides a rationality evaluation method, device and equipment for hydraulic support selection, the method comprising: obtaining multiple monitoring indexes of the hydraulic support, and determining original indexes according to the monitoring indexes; the monitoring indexes include initial support force, step sequence final resistance, safety valve opening pressure, safety valve opening time, column subsidence, roof beam deflection angle and impact acceleration; the original indexes are normalized, the obtained standardized data is input into a trained neural network model, and a rationality prediction result is output; the rationality prediction result is scored based on a target function to obtain a score result, and the rationality grade of the hydraulic support selection is determined according to the score result. The present application solves the problem in the prior art that the evaluation of hydraulic support selection relies on a single static index and lacks dynamic multi-dimensional comprehensive analysis, realizes intelligent comprehensive evaluation based on multi-source monitoring data, and improves the rationality and accuracy of selection.

The invention relates to the technical field of coal mine roadway surrounding rock reinforcement, in particular to a small coal pillar gob-side roadway surrounding rock stability control method which comprises the following steps: establishing four immediate roof fracture mechanical models; calculating correlation among direct roof shearing force, bending moment and deflection; judging the type of the mechanical model to which the small coal pillar gob-side roadway belongs; calculating a mathematical relationship between the maximum value of direct roof deflection and the supporting force of the small coal pillar; carrying out primary loading on a plurality of rock samples, coal samples and a plurality of groups of grouting reinforcement material consolidation samples, and carrying out secondary loading on a grouting coupling test body by adopting an orthogonal test; obtaining an optimal grouting reinforcement material, consolidation time and an injection rate; establishing a gob-side roadway small coal pillar grouting reinforcement numerical model through FLAC3D, and simulating the gob-side roadway small coal pillar grouting reinforcement numerical model; an optimal grouting layout scheme is obtained through a simulated annealing algorithm; determining an optimal grouting reinforcement scheme; test and simulation are combined, support reinforcement parameters are scientifically evaluated, the stability of the surrounding rock of the small coal pillar gob-side roadway is effectively controlled, the method is simple, and the cost is low.

This invention relates to the field of coal mining technology, specifically to a method for large-area gas control. The method comprises the following steps: delineating the boundary of the large-area gas control zone; using a TBM (Tube Milling Machine) to excavate a boundary roadway starting from the center of the boundary of the large-area gas control zone; excavating a connecting roadway within the area enclosed by the boundary roadway; drilling a through borehole within the coal seam area enclosed by the connecting roadway and the boundary roadway; and using fracturing and extraction technology to extract gas within the through borehole. Utilizing the rapid roadway construction advantage of the TBM, long-distance, high-efficiency rock breaking operations can be achieved, improving the mechanization and intelligence level of the working face. Following drilling and gas extraction, compared to traditional mechanized mining and blasting, this method significantly reduces disturbance to the surrounding rock, lowers the probability of coal and gas outbursts, effectively improves gas control efficiency, and enables safe and efficient mining of deep coal resources, effectively solving the corresponding technical problems existing in the prior art.

The application discloses a green pressure relief method for mine pressure appearance caused by multi-coal seam mining residual coal pillars and belongs to the technical field of multi-coal seam mining. The intelligent decision system of multi-source data fusion is used to solve the problem of response lag of the traditional method. The coupling process of supercritical CO2 gas expansion pressure relief and biodegradable hydraulic fracturing technology is adopted to realize low pollution and coal pillar structure protection in the pressure relief process. Through the whole-process closed loop of "monitoring-prediction-decision-verification", the problem of multi-coal seam stress superposition control is broken through, and the method is especially suitable for the complex geological environment of mine pressure appearance caused by multi-coal seam superimposed mining.

The invention belongs to the technical field of coal mining, and particularly relates to a coal cutter coal cutting speed control system and method based on a comprehensive detection signal, and the method comprises the steps: arranging sensor modules at an air inlet crossheading, a working face support, a coal cutter, a working face upper corner and an air return crossheading; acquiring sensing data of each sensor module in real time, and judging whether the walking speed and the cutting speed of the coal mining machine need to be changed or not; when the walking speed and the cutting speed of the coal mining machine need to be reduced, sensing data of all the sensor modules are input into the first machine learning module in real time, the cutting speed and the walking speed value are output through the second machine learning module, and when the walking speed and the cutting speed of the coal mining machine need to be increased, the second machine learning module outputs the cutting speed value and the walking speed value. And sensing data of each sensor module are input into a second machine learning module in real time, and cutting speed and walking speed values are output through the second machine learning module. The control precision of the walking speed and the cutting speed of the coal mining machine is improved.

The application discloses a kind of based on injection flow dynamic monitoring's multiple cracks synchronous perforation interval optimization adjustment method, including rock sample test piece, high temperature-high pressure flow monitoring meter, data acquisition etc..Method includes the following steps: setting temperature, confining pressure and injection flow rate;Record perforation interval;Record analysis multiple crack propagation path;Establish the relationship between crack propagation path and injection parameter;Determine the optimal perforation interval under certain temperature, pressure, injection flow rate.The optimization adjustment method of the application can obtain the multiple crack synchronous cracking propagation law of rock mass under THM coupling state on the basis of specific test research, fundamentally reveal the synchronous cracking propagation control mechanism of rock mass multiple crack from "non-equilibrium" to "equilibrium" transformation under stress shadow effect, and the determination of best perforation interval in specific engineering practice can not only greatly improve coalbed gas production, realize safe and efficient exploitation of coalbed gas, but also greatly reduce the investment of early cost.

The present application discloses a method for designing parameters of a longwall cemented backfill coal mining working face. The working face parameter design is completed by determining the width, length, spacing, filling pipeline layout, and filling rate parameters of the filling lanes. The width and length of the lanes are determined by the filling coal mining equipment and process, and the stability of the lanes. The spacing of the filling lanes is determined by the location of the mining stress concentration zone. The filling pipeline layout is determined by the shape of the lanes and the filling process. The filling rate is determined by the protection level of the surface buildings. The patented method of the present invention is of great significance to improving the safety factor of the working face, enhancing the production efficiency of the working face, and improving the management of the working face. At the same time, it improves the filling coal mining theory to achieve the purpose of safe and efficient mining. The method is simple to implement and has great promotion value.

The invention discloses a coal and rock mass grouting reinforcement method for a coal face of a mine, which is characterized by comprising the following steps: preparing materials, tools and related accessories; performing hole marking by an acceptor; constructing a grouting hole; after the construction of the grouting hole is finished, accepting a drilled hole and sealing the hole; grouting, checking a grouting effect, stopping grouting, and cleaning equipment and a site; wherein in the grouting hole construction step, a plurality of sets of grouting holes are formed in a grouting reinforcement area, the distance between the sets is 3 m, each set comprises two grouting holes, and one grouting hole is formed in the coal face coal wall and one grouting hole is formed in the coal face top plate.

The utility model discloses a roadway arrangement structure for a jump mining working face in a mining area based on a rock burst mine, which is characterized in that a second stope working face and a third stope working face are respectively arranged on two sides of a first stope working face, and a fourth stope working face is arranged on one side, far away from the first stope working face, of the second stope working face; a measure roadway is formed in the middle section of the second stope working face and the fourth stope working face and penetrates through the second stope working face and the fourth stope working face, the two ends of the measure roadway are communicated with the roadways on the two sides of the measure roadway respectively, and the included angle between the measure roadway and the roadways ranges from 50 degrees to 70 degrees. The utility model has the advantages that the structure is simple, the implementation is easy, and the roadway arrangement is simple; the condition of continuous mining interruption is avoided, and high-yield and high-efficiency development of a coal mine is ensured; the roadway is not wasted, repeated use is achieved, economic benefits are remarkable, drainage and drainage are more convenient, the goaf flood risk is reduced, safe stoping of the fourth stoping face is facilitated, and the safety coefficient is high.

According to the grouting method for advanced treatment of the high-pressure-bearing karst water disasters of the coal seam floor, the specific grouting process is set, normal-pressure grouting is adopted at the initial stage of grouting, only too grey water exists in cracks, and after grouting slurry is injected, due to the fact that the density of the slurry is larger than that of the too grey water in the cracks, the slurry can enter the cracks through self weight, and the grouting effect is achieved. The effect of replacing too grey water by the slurry is achieved; the pressurization grouting stage aims to block a small crack channel, under the action of pressure, grout is further diffused in the transverse direction and the longitudinal direction, the control range of drilling grouting is widened, and originally isolated cement is firmly connected into a whole; later-stage high-pressure grouting is used for consolidating the early-stage grouting effect, and due to the fact that the water head pressure of a corresponding area is high and generally ranges from 6 Mpa to 8 Mpa, the solidification anti-pressure capacity of pressurized grouting cement is 1t; in the later stage of the pressurized grouting stage, grouting needs to be conducted, the cement injection amount is adjusted, and the grouting pressure is increased; therefore, the effective protection layer thickness is increased, and the purpose of safe coal mining is achieved.

The application discloses a kind of ten million tons intelligent fully mechanized working face top coal ground fracturing regulation methods, applied to coal mine well mining technical field. Including the following steps: analysis coal seam and the initial state of top coal, establish the relationship between coal seam pressure capacity and pressure;Coal seam and coal flow dynamic model, build the differential relationship of coal flow dynamics;Establish the optimization model of top coal rate, optimize intelligent top coal strategy;Implement ground fracturing technology, establish the model of ground fracturing pressure change;Real-time monitoring and adjusting top coal pressure, establish the coupling model of top coal stress and top coal rate;Intelligent regulation system feedback and adjustment, establish feedback regulation control model;In the process of coal flow and top coal pressure regulation, establish the coupling relationship of coal flow and top coal;The effectiveness of the model is verified by numerical simulation, and the parameters are adjusted according to the actual situation, finally realize the comprehensive regulation and optimization of coal flow and top coal.