2998 results about "Coal mining" patented technology

The invention discloses a coal-rock interface identifying method and system based on an image. The method comprises the following steps of: acquiring multiple color images of coal and rock on a coal mining working face; extracting a vector based on an image characteristic serving as a sample characteristic vector specific to each color image to obtain a known sample set of coal and rock; and establishing a coal-rock classifier model by adopting a Fisher linear judging method and taking the known sample set of the coal and rock as a training sample set. In the working process of a coal mining machine, a color image of the coal and rock which is cut by using a drum is acquired in real time, and the extracted characteristic vector is input into the coal-rock classifier model to identify a coal-rock type. The system consists of a light source module, an imaging module, a processing module and an anti-explosion shell. The coal-rock interface identifying method and the system provided by the invention have the characteristics of simple structure, easiness for distributing, high suitability and the like, the coal-rock type cut by using the drum can be automatically identified in real time, and reliable coal-rock interface information is provided for automatic heightening of the drum of the coal mining machine.

A coal mining solid filling method comprises following steps: using the stacked solids on the ground as the filling materials for the working surface goaf, directly putting the solid filling materials from the ground to a belt conveyor in the underworkings by a perpendicular feeding well, transporting to the end of a coal face through the underground belt conveyor, reloading the solid filling materials to a solid filling mining conveyor hung under a back tail beam of a self-impacting type filling hydraulic support by a self-moving type filling material reloading machine. In the process of mining work, the coal is mined and the filling materials are filled on the bottom; and the solid filling materials are compacted by means of a compactor of the self-impacting type filling hydraulic support. The method solves the problem of coal compaction under the building and low coal recovery.

A method to suck pressure relief firedamp along Y-shape ventilating gob roof of the empty tunnel is characterized in that: in the high-firedamp coal mining working-face pressure relief zone along the empty tunnel gob roof, it sucks the stripping and free firedamp from the exploiting and pressure relief layer which gathers in the gob upper part and the ring slit loop through the slit channel formed by the mining influence on the gob upper rock stratum through the dip sucking firedamp bore-hole which are distributed in the pressure relief ring slit loop. The pressure relief ring slit loop locates in the separation layer slit zone above the caving zone on the Y-shape ventilating working-face along the empty tunnel gob roof. The invention resolves the air firedamp overrun in the corner and the return airway on the coal mining working-face basically, realizes the sucking and application of the high density firedamp, improves the resource utilization ratio, exploits the high firedamp coal seam without coal wedges, improves the mine resource recovery and assures the high-efficiency and safe exploitation of the coal mining working-face.

The invention relates to a method for controlling caving and lane-guarding. The method is characterized in that in a working surface roadway, drilling, blasting or cracking are carried out on a roof of a coal seam of complete hard strata with large thickness of a hanging arch in a goaf; bursting or cutting off are carried out on a complete hard roof strata with large thickness to facilitate the hanging arch in the goaf to collapse at the back of a force piece; collapsed waste rock fills the goaf, supports superincumbent stratum in a fissure zone and releases high bearing stress passed into the coal body adjacent to the goaf from weight of the large-thickness complete hard strata of the hanging arch in the goaf and the superincumbent stratum in the fissure zone thereof, so that the bearing stress in the coal body adjacent to the goaf is reduced and laneways in the space are protected. The method of the invention fundamentally improves stability of surrounding rock of laneways adjacent to the goaf and increases coal mining rate of ends of thick coal seam caving coal working surface.

The invention relates to an intelligent type full-automatic combined coal mining system, which comprises a coal mining and loading device, a conveying device, a supporting device, and an equipment train, and is mounted in the working face and crossheading in the coal mine well. The coal mining and loading device is mounted on the conveying device, the coal conveying port of the conveying device is conveyed to the outside of the well or the coal bunker through a belt type conveyor in the crossheading, the supporting device is arranged behind the conveying device for supporting the top plate of the coal seam and linking with the conveying device, the equipment train comprises a central control chamber of a central control equipment, a starter, a power device, and a lifesaving cabin, the central control equipment monitors and controls the coordination operation of the devices, the equipment train, and the power device of the equipment train, the power device provide power source for the devices and the equipment train, and the equipment train moves freely in the crossheading with the feeding of the working faces. The invention improves system complete ability and execution efficiency, and has strong function, high intelligent degree, high safety, high production efficiency, and the like.

The method comprises: sampling coal core from underground mining; at underground mining, measuring and calculating the gas loss quantity of coal core; at the ground, measuring and calculating the desorption of the coal mining gas; measuring and calculation the grind gas desorption of partial coal core; calculating the content of gas capable of being desorbed.

The invention discloses a solid-filling coal mining method with two pre-excavating tunnels for advancing. A mining roadway adopts an arrangement mode that the pre-excavating tunnels are taken as air return and inlet roadways and a gob-side entry retaining roadway is taken as a roadway for transporting filling materials and coal; coal extraction and gob backfilling are carried out by a comprehensive mechanical solid-filling coal mining process; and according to the coal mining method, a mining sequence is propelled by making a filling coal mining work surface be back to the direction for transporting the coal to a mountain in a mining area. The pre-excavating tunnels are formed before the extraction of the work surface by tunneling, and the gob-side entry retaining roadway is formed by optimally designed filling bodies beside the roadway along with the implementation of advancing filling coal mining operation along the work surface. The coal mining method is simple in process and technically and completely realizes coal milling without pillars, and the resource extraction rate of the coal is high. The coal mining method can not only solve the technical problems that a draw-back-type down-mining and up-filling work surface cannot ensure a filling effect during a filling milling process of a mine with shortage of resources, but also materialize the comprehensive mechanical solid-filling coal mining of mines with limited geological conditions by virtue of an advancing up-milling and down-filling work surface.

The invention discloses a real-time monitoring and intelligent evaluation system for the health degree of an electric traction coal mining machine. The real-time monitoring and intelligent evaluation system comprises the coal mining machine, a wireless monitoring device, a crossheading upper computer and an above-well monitoring center, wherein the coal mining machine in the system is a monitored object; sensors such as a voltage sensor, a current sensor, a temperature sensor, a flow sensor, a pressure sensor, a position sensor and a vibration sensor are arranged on a machine body of the coal mining machine by a distribution method to form a left rocker arm monitoring unit, a right rocker arm monitoring unit, a high-voltage control box monitoring unit, a vibration monitoring unit and a machine body periphery monitoring unit, thus running state signals of the coal mining machine can be acquired. According to the system and the method which are disclosed by the invention, the real-time health degree monitoring efficiency of the overall coal mining machine is improved, the fault incidence rate of the coal mining machine is reduced, and the working condition of the overall coal mining machine and the working environment of an underground operator are improved; the system has great significance on implementation of underground unmanned or few-people mining of a working face.

The invention discloses a drum-coal-mining-machine-based thin coal seam unmanned automated mining technology. The technology has the characteristics that: persons do not exist on an operating surface; operators know about conditions of the operating surface through video in a control center far from the operating surface and simultaneously complete various kinds of operation; video signals and control instructions are transmitted through a wireless switch; a coal mining machine has a function of memory cutting and is provided with a position monitoring device and an infrared transmitter at the same time, coal is automatically cut according to a preprogram, and operation parameters such as positions, directions and the like are sent out at any time; a bracket controller receives the parameters, automatically drives an electric hydraulic control valve to do actions of column lowering, frame moving, pushing, column erecting and the like according to the preprogram, and a hydraulic bracket is pushed to move forward along with the coal mining machine, so that the unmanned automated mining on the operating surface is realized; and when the thickness of coal seams, and top and bottom boards are changed, the operators regulate operation programs and the parameters in the control center and perform manual intervention on the coal mining machine and the hydraulic bracket, so that the remote-control unmanned automated mining on the operating surface is realized.

A band filling stoping mining method effectively solves the problems in the prior stoping mining of a 'three-low' coal bed, such as the sedimentation and distortion of the earth surface, the low recycling rate of coal and charcoal resources, the existence of safety hazards, etc. The method comprises the following steps: a transporter and a coal mining machine are laid on the working face of the mining area; in the direction perpendicular to the direction of the transporter movement, a timbering device which is composed of a hydraulic bracket of the working face, a side molding board bracket for filling beside the lane and a back molding board bracket for filling beside the lane, and connected with the connecting head of the transporter is arranged; after the brackets are pushed along the working face, paste concrete is injected through a pipeline into a filling mold cavity enclosed by the brackets, so as to form a band-shaped filling wall which is supported between the top plate above the goaf and the bottom plate of the coal bed. By the method, safe and convenient mining operation is ensured; the recycling rate for coal and charcoal is increased; meanwhile, the sedimentation and distortion of the overlying strata of the coal bed and the earth surface can be controlled in a very small range of deformation permitted by a building, thereby minimizing the amount of gentle sedimentation of the earth surface, and protecting buildings and attachments on the earth surface.

The invention discloses a monitoring system and a method for an integrative mining working surface. The intelligent video monitoring system comprises a coal mining machine positioning system, a video collecting system, an intelligent control system, a video transmitting system and a ground display system. The coal mining machine positioning system judges a position where a coalmining machine is positioned; the video collecting system obtains a real-time video image of the integrative mining working surface; the intelligent control system can quickly judge the position where the coal mining machine is positioned, controls the opening of a shield function of an area where the coal mining machine is positioned, and enables the ground display system to be capable of being automatically switched to an image of a camera in the area where the coal mining machine is positioned; the video transmitting system can convey a video signal to a ground monitoring center through an Ethernet or an optical fiber; and the ground display system can automatically display the video image at the position where the coal mining machine is positioned and also can randomly retrieve the real-time image of any camera. The monitoring system and the method are advanced and scientific; the blank that the integrative mining working surface does not have video monitoring is filled; and the monitoring system and the method have the advantages of high degree of intelligence, safety, reliability and the like.

The invention discloses a goaf bag-type packing method, comprising the following steps: suspending a plurality of flexible filling bags at intervals in a goaf from an open-off cut, arranging a plurality of individual props at the outer side of a plurality of flexible packing bags, then erecting a formwork supported by the individual props outside the flexible filling bags; filling high-water material seriflux containing more than 85% of moisture into the bags until the bags are full, and removing the framework and the individual props after the high-water material in the bags are consolidated to complete a row of filling cycle. With the propulsion of coal mining working face, the following row of filling work is carried out continuously, flexible filling bags are suspended next to the front row to perform bag suspension and filling circularly of the next cycle until the filling work of the whole goaf is finished. The invention can directly support the top plate of the goaf, thereby effectively reducing the submergence of the top plate and controlling ground surface movement. The bag-type packing method is particularly suitable for filling the goaf of an inclined mining working surface with smaller strike propulsion or coal seam pitch, and has the advantages of simple technology, easy construction, low cost, simple operation and high filling efficiency.

The invention relates to a long-wall coal method, which can be used in stable coal bed, rigid top plate, non-broken incline middle-thickness coal bed, and thick coal bed layered long-wall method. Wherein, it arranges hydraulic support, scrape transporter, and roller coal machine at the long-wall working surface; arranges groove transporter and flexible band transporter at the transport channel; the working surface has ultra long length, which is two times of integrated coal surface; it uses two coal machines on one scrape transporter, to scrape the upper half surface and the lower half surface; and it can arrange middle channel at the middle of integrated surface as the transport channel; and arranges scrape transporters at the upper and lower half working surfaces. The invention has high efficiency, while it can reduce the digging rate and improve the resource recycle rate.

The invention discloses a fluid-solid coupled similar simulation experimental platform which comprises a box body top plate, a box body bottom plate, a front baffle, a rear baffle, a left lateral insertion plate and a right lateral insertion plate, wherein the box body bottom plate, the front baffle, the rear baffle, the left lateral insertion plate, the right lateral insertion plate and the box body top plate form a closed box body structure of the experimental platform; a transmission bar is arranged in the box body structure and is positioned above the box body bottom plate; a mining steel plate is arranged above the transmission bar and is movably connected with the transmission bar; a coal layer is laid on the mining steel plate; a simulated rock stratum is arranged above the coal layer; a data monitoring system is arranged in the simulated rock stratum; a pressure-bearing steel plate covers the top of the simulated rock stratum; and a hydraulic jack is arranged between the pressure-bearing steel plate and the box body top plate. The experimental platform disclosed by the invention is simple in structure and low in manufacturing cost, a research worker can directly observe and record the movement and deformation conditions of overlying rock and the water permeability condition in the rock stratum cracks under the mining action, and the influence of coal mining on permeability rules of surface water and karstic water is analyzed.

The invention discloses a method for controlling roof caving under a condition of hardroof in coal mining, belongs to the technical field of coal mining and particularly relates to a quantitative method for controlling roof caving under the condition of hardroof in coal mining. The invention adopts a technical scheme that the method mainly comprises a method for determining a trough pull position, trough pull depth and explosion work amount for initial roof caving under the condition of hardroof and a method for determining the reasonable length of a hanging arch for periodical roof caving under the condition of hardroof. In the invention, the roof caving mode is controlled to reduce the pace of initial top coal collapsing of a working face, the through pull depth and the explosion work amount are the smallest in all hardroof control modes and the operation is easy; the relationship between the pace of initial top coal collapsing and the trough pull depth is specified quantitatively; based on the design working resistance of a bracket of the working face, the method for determining the reasonable length of the hanging arch of a hardroof rock beam is obtained, so the hardroof control is more scientific, quantitative, accurate and simple; and the method can be widely used in control of roof caving under the condition of hardroof in various kinds of coal mining.

The invention discloses an environment-friendly flame-retardant high-molecular gel inhibitor for preventing coal from spontaneously combusting of coal mine, which takes water as a solvent and comprises the following components with percentage concentration by weight: 7-10 percent of high-molecular base material, 0.1-0.5 percent of inorganic inhibitor, 0.1-0.5 percent of flame retardant agent, 0.01-0.5 percent of surface active agent and 0.1-3 percent of reinforcing agent. The environment-friendly flame-retardant high-molecular gel inhibitor has the advantages of simple operation, good wall-absorbing property and inhibiting effect, flame retardant property and environment protection; a coating layer can bear the action of flame for a plurality of times and has large mechanical strength, and a coating film is stable and does not fall off in the humid environment. In the process of coal mining, the inhibitor solution is sprayed to superficial coal and combustible areas behind a coal-mining working surface and the spontaneous combustion tendency of coal can be reduced, therefore, the environment-friendly flame-retardant high-molecular gel inhibitor prevents the spontaneous combustion of coal thoroughly and is applicable to the operation under a mine and coal storage.

The invention relates to a method for controlling roof caving under condition of hardroof in coal seam, which belongs to the technical field of coal mining and tunnel surrounding rocks controlling, and solves the problems of influence by crustal stress, poor controllability, pollution and inapplicability for high gas seam in the prior art. The method comprises the following steps: 1) constructing and boring rock stratum at the top of the coal seam along an open-off cut of a fully mechanized working face at the beginning of mining process and along one side of a return air laneway and a transporting mining roadway of the working face close to a coal column at a primarily mining phase and at a normal robbing phase; 2)implementing the operation of hydraulic slotting along a borehole, wherein the slotting direction is respectively consistent with the direction of the open-off cut, the return air laneway and the transporting mining roadway; and 3) sealing holes at two ends of the borehole, implementing hydraulic fracturing in the boring, and communicating the pressing cracks generated in the adjacent boreholes. The method for controlling roof caving under condition of hardroof in coal seam is used for controlling roof caving of high gas seam and hardroof, and has the advantages of good controllability, no influence by crustal stress, no pollution and easy operation.

The invention discloses an inclined separated layer solid filling coal mining method for a super thick coal seam, which is suitable for the exploitation of an 'under three' super thick coal seam. The method comprises the following steps: determining the number of inclined separated layers according to the principle that thickness of each separated layer is 2.5-4.5 m; adopting a exploitation sequence that mining layer by layer, and filling at a next row; arranging tunnels and equipment according to the conventional solid filling coal mining method; carrying out a circulating sequence that coal mining firstly, metal nets and bamboo fences paving secondly, and filling finally to complete the filling exploitation of a first mining surface and a first separated layer; meanwhile, mining according to the same filling coal mining method under the shield of a manual false roof formed by the first separated layer at the corresponding position of a second separated layer 4 months after a working face of the first separated layer finishes mining; circulating in the way that the exploitation of one separated layer is performed under the shield of a manual false roof manufactured by an upper separated layer continuously until the whole super thick coal seam is mined out. Through the adoption of the method, resources of the 'under three' super thick coal seam can be utilized, the rock formation movement and earth surface sinking can be effectively controlled; and the recovery ratio is high, the production efficiency is high, the cost is low, and the method has wide practicability in the field of thick coal seam filling exploitation.

The invention relates to an in-time supporting device for a fully-mechanized coal mining machine, comprising a pedestal, a top beam, a hydraulic upright post which connects the pedestal and the top beam, side frames which consist of four link mechanisms, and a telescopic connecting beam and a hydraulic cylinder which are hinged between two side frames. The invention adopts the technical key points that: top beams of the side frames adopt front top beams or continuous top beams; the side frames which are arranged in parallel and provided with the front top beams or the continuous top beams are hinged into a front support or a continuous support through an arched beam or a horizontal beam; shun beams are arranged on the arched beam or the horizontal beam at intervals; belt guard beams or telescopic shun beams are arranged between adjacent shun beams. The in-time supporting device for the fully-mechanized coal mining machine effectively solves the problems in the prior art of lagged supporting means, difficult frame movement, requirement of stop operation, low efficiency and so on, is reasonable in structural design, stable in supporting operation, convenient in assembly and disassembly and maintenance, and safe and reliable in use, preferably meets the requirements of matched operation of underworkings and the fully-mechanized coal mining machine, realizes in-time mechanical support of a just exposed roof of a tunneling work surface of a laneway, and shields the fully-mechanized coal mining machine to realize continuous operation.

A combined initial alignment system and alignment method for a strapdown inertial navigation system of an underground coal mining machine belong to initial alignment system and alignment method for positioning navigation of underground coal mining machines. The system is composed of a strapdown inertial navigation system installed on the coal mining machine, a wireless sensor network mobile node, an inclination sensor, a geomagnetic field sensor and anchor nodes installed on a hydraulic support. After coarse alignment of the strapdown inertial navigation system, the wireless sensor network is used to detect the location information of the underground coal mining machine, the inclination sensor measures the roll and pitch angle, and the geomagnetic field sensor measures the yaw angle. A pose measurement equation of the coal mining machine is constructed, and the pose measurement equation is combined with an error model after the coarse alignment of the strapdown inertial navigation system to establish a state equation; fusion smoothing is carried out to obtain the accurate location information of the coal mining machine; and the precise alignment of the strapdown inertial navigation system is conducted to complete the initial alignment. The invention realizes precise initial alignment of strapdown inertial navigation combination under the severe closed condition in coal mine, and greatly improves the precision of the integrated positioning under large misalignment angle of the strapdown inertial navigation system of the coal mining machine.

The invention discloses a refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction. The method comprises the following steps of: gradually and alternately constructing hydraulic fracture holes and gas extraction holes in the coal bed direction in a coal mining working face tunnel, an airway or a tunneling working face, and performing high-pressure water injection and gas extraction; stopping injecting water after the water is injected into the hydraulic fracture holes for 0.5 to 5 hours, and changing gas extraction pipe joints to extract gas; after the hydraulic fracture hole or gas extraction concentration is lower than 5%, changing water injection pipes to perform static pressure water injection; and when the coal mining working face is recovered to the position 5 meters away from the static pressure water injection holes or the tunneled working face is tunneled again, stopping a pump or closing a static pressure water valve to stop water injection. According to the method, refection reduction of the gas-containing coal bed is realized, the gas extraction rate is improved, the gas in the mining space is effectively prevented from exceeding the limit, outburst risks of coal and gas are reduced, and safe and efficient recovery of coal is ensured. The method is simple and good in effect.

The invention discloses a simulation test system and monitoring method for a disaster of roof water burst and sand inrush induced by coal seam mining. The simulation test system comprises a bracket, wherein a test bin is arranged inside the bracket; a movable coal-mining simulating dragging plate is arranged at the bottom of the test bin; a water-sand gathering channel obliquely arranged is arranged below the coal-mining simulating dragging plate; a water-sand collecting device is arranged at the outlet of the water-sand gathering channel; the test bin is formed by a bottom plate, a right side wall, a front transparent plate body, a back transparent plate body and the coal-mining simulating dragging plate; a plurality of pore water pressure sensors and a plurality of pressure sensors are arranged inside the test bin. According to the invention, the simulation test for the disaster of the roof water burst and sand inrush induced by coal seam mining is carried out by adopting the technical scheme that the test bin is filled with coal measure strata simulating materials, so as to obtain water-sand inrush parameters of different stratum combinations, therefore, the identification degree of the characteristics of the disaster of operating face water burst and sand inrush induced by coal seam mining is improved.

The invention relates to a construction method of consolidating horizontal directional drilling holes by grouting a coal seam baseboard. Along with the continuous extension of coal mining depth and the continuous enlargement of the mining range, crustal stress is enlarged, and the number of abnormal geologic bodies is gradually increased, water pressure is gradually enhanced, hydrogeologic conditions become more and more complex, and water-inrush threat becomes more and more serious. The construction method provided by the invention comprises the following steps of: drilling holes in a coal seam by developing a drill field in a coal heading of a working surface, wherein the drilling direction points to a water resisting layer and a water bearing layer of the coal seam baseboard; rotatably drilling the coal seam baseboard for a certain depth to carry out hoist drilling and broaching, installing a primary hole sealing sleeve to seal the hole by grouting, cleaning the bottom of the hole after the grout is solidified; and then consolidating the hole by a primary sleeve, consolidating the hole by a secondary sleeve, and carrying out directional drilling to make the drilling hole extend along a preset consolidating layer according to the designed track to finally form the drilling hole. In the invention, the entire consolidation of the coal seam baseboard of the regional working surface is realized through designing the drilling hole track, determining the drilling hole consolidating radius and reasonably arranging the directional drilling according to the analysis to the water resisting layer and the water bearing layer.

The invention discloses a three-dimensional simulation experiment table which mines coal and gas together. The experiment table includes a box body. The box body is provided with a pressurizing device used for uniformly loading on the rocks in the box body to realize mine pressure simulation. The experiment table is also provided with a coal mining device which can move at the bottom part of the box body to simulate the process of cutting coals by a coal mining machine. The box body is also provided with an air inlet device and a plurality of gas detecting sensors used for the simulation experiment of the gas to move in a porous medium in a mining field during the process of simulating the coal bed mining and the desorption and moving rules of the gas in the coal rock bodies that are relieved from pressure, deformed and crashed during the process of comprehensively researching the coal bed mining to work out the space-time evolvement and distribution rules of the coupling between the gas moving and the coal rock body cranny. Then the simulation research and mining scheme design on mining coal and gas together are carried out according to the researching result.

The invention relates to a support-type comprehensive tunneler which comprises a non-tracked tunneler, a tunneler chassis, a left hydraulic support, a right hydraulic support, a drilling rig and scraper conveyors, wherein the tunneler is arranged on the tunneler chassis, and two advancing jacks are arranged on the tunneler chassis; the other ends of the two advancing jacks are respectively connected with the left hydraulic support and the right hydraulic support, and the two sides of the tunneler chassis are respectively provided with a lateral pushing oil cylinder; forestopes of the left andright hydraulic supports are respectively provided with a group of metal mesh storages, and the tail of a main top beam of the support is hung with the drilling rig; the tail of a first scraper conveyor is arranged on a spade plate of the tunneler, and the head of the first scraper conveyor and the tail of a second scraper conveyor are overlapped; and the head of the second scraper conveyor and the tail of a belt loader are overlapped, and sleds are arranged at the back of the two hydraulic supports. The tunneler has the advantage that the drilling support and the coal cutting of the tunnelerare simultaneously carried out, and also has the automatic lapping function, thus reducing labor intensity and increasing the coal mining efficiency by over 4 times.

Disclosed are a method and a system for coal and rock boundary dividing based on coal and rock image feature extraction and classification and recognition. The method includes firstly, photographing coal and rock images on a coal mining working face, extracting texture feature information of the coal and rock images, and constructing a feature vector, wherein the texture feature information comprises the original images and the angular second moment, the contrast, the correlation, the mean value and the variance of every low-frequency coefficient image with Daubechies wavelet decomposition scale, and the texture feature information also comprises the total mean value and the total variance for calculating high-frequency coefficient images in horizontal, vertical and diagonal directions; and lastly, creating a best classifier to recognize the coal and rock boundary. The system comprises an image acquisition module, a feature module, a classification and recognition module, a result display interactive module, a memory module and a central control module. The method and the system for the coal and rock boundary dividing based on the coal and rock image feature extraction and the classification and recognition have simple calculation, less human intervention and low cost, can improve classification accuracy and efficiency of the coal and rock images in complex environments effectively, and provides accurate and reliable coal and rock boundary information.

In an underground exploitation process of a coal mine, the coal recovery rate needs improving, and a roller bit of a coal mining machine is prevented from cutting roof strata as far as possible so as not to damage equipment or even cause accidents, so an interface of a coal layer and a rock layer needs on-line identification. The invention provides a coal-rock interface identification method, a coal-rock interface identification system and a coal-rock interface identification probe. A specific energy-level high-pressure water jet which can penetrate the coal layer but cannot penetrate the rock layer is jetted to the coal layer above a tunnel, different acting forces of reflected flow reflected by the coal layer or the rock layer on a nozzle are sensed in real time, and a controller judges the distance between the upper end of the roller bit of the coal mining machine and the coal-rock interface to realize automatic heightening control of a rocker arm of the coal mining machine so that the coal exploitation process realizes the goals of high recovery rate, low mechanical abrasion rate, automatic operation and the like. The coal-rock interface identification method, the coal-rock interface identification system and the coal-rock interface identification probe provided by the invention have the advantages of low cost, high adaptability, high reliability, intrinsic safety and the like.

The invention discloses a flooding damage control method for water-diversion fracture main channels of drill-hole-grouting plugged overburden rock. The method comprises the steps: collecting surface-drilling columnar data of all coal mining areas according to development characteristics of altitude of water-diversion fractured zones of overburden rock mined under specific mining conditions, determining stratum positions of all key strata in the overburden rock by adopting a key stratum position distinguishing method, then, determining development altitude of a water-diversion fractured zone of each area and areas of distribution of communicating strata and water-bearing strata of each area by an overburden rock water-diversion fractured zone altitude prediction method, finally, laying out the range of distribution of the water-diversion fracture main channels in areas of the communicating water-bearing strata of the water-diversion fractured zones. and determining a grouting drilling type and drilling construction parameters according to borehole tunnel positions, coal bed cover depth and ground drill distribution conditions; after drilling construction is completed, pumping slurry to areas of the water-diversion fracture main channels so as to plug water-diversion fracture channels. The flooding damage control method for the water-diversion fracture main channels of the drill-hole-grouting plugged overburden rock, disclosed by the invention, is determined, can adapt to different mining conditions and can provide a guarantee for water resource protection, flooding damage control and the like of coal mining of mining areas, the use method is reliable, and the practicability is high.

The invention discloses a high-pressure gas injection hole-drilling pressure-releasing outburst prevention method which comprises the steps of: firstly, carrying out common drilling operation in a bottom plate stone drift (2) of a coal bed (1) in front of a coal mining or driving face; after a drill hole (3) enters a design depth of the coal bed, drawing back a drill, sending a jet nozzle (4) anda high-pressure drill rod (5) connected with the jet nozzle into the drill hole, and connecting a high-pressure gas-storing device (6) connected with the tail of the high-pressure drill rod (5) with a high-pressure gas compressing device (7) through a high-pressure tube; starting the high-pressure gas compressing device (7), carrying out near cylinder rotary impacting, cutting and holing on the hole wall of the drill hole in the coal bed (1) by using high-pressure impact wave as a power source through the jet nozzle (4) capable of jetting high-pressure airflow and automatically rotating to ensure that the coal body around the drill hole (3) is gradually crushed and separated from the hole wall to form pressure releasing space and subjected to the pressure balanced permeability increase through ground pressure and gas pressure action. According to the invention, the drainage efficiency of the gas in the coal bed is greatly improved and the outburst damage of the coal bed is reduced.

The invention discloses a method for coal mining to the greatly oblique coal layer, comprising two steps: designing the method and back producing technique, placing slit flexible shielding support in the coal layer of 8-10m and deciding return airway and cutting point; the back producing technique includes enlarging airway, installing support, put down support and desinence of working face, etc. The method has simple operational steps as well as remarkable economic benefit.