986results about "Disloding machines" patented technology

The disclosure relates to the technical field of tunnel excavation, in particular to a non-blasting tunnel boring machine and a tunneling method. The tunneling machine comprises a vehicle-mounted device (1), a rotational driving device (2), a translation device (40), a working disc (3), a foundation trench excavation device (4), a drilling and splitting device (5), a hazard removal device (50), a dust suppression device (6) and a material feeding device (7). The rotational driving device (2) is arranged on the vehicle-mounted device (1), the working disc (3) is connected with the rotational driving device (2), the rotational driving device (2) drives the working disc (3) to rotate around a center of the working disc, the foundation trench excavation device (4) is arranged on the working disc (3), the drilling and splitting device (5) comprises a drilling machine (51) and a rock splitter (52) both arranged on the working disc (3), the drilling machine (51) is suitable for drilling a hole in a tunnel face in an annular crack arrest groove, the rock splitter (52) is suitable for splitting the tunnel face, the hazard removal device (50) is arranged on the working disc (3), the dust suppression device (6) is arranged on the vehicle-mounted device (1), and the material feeding device (7) is used for receiving and conveying materials dropped during excavation.

The invention relates to a horizontal well jet flow axial slotting pressure relief coal and coal bed gas co-mining method. The method comprises the steps of horizontal well building, axial continuous hydraulic slotting, coal bed drainage pressure relief and coal and coal bed gas co-mining. The axial continuous hydraulic slotting comprises the steps that a casing pipe is put into a horizontal well; a plurality of slots are formed in the sleeve, and a directional structure is arranged in the sleeve; the water jet tool pipe column is tripped into the casing pipe, and the lateral nozzle is kept to move directionally along the directional structure; when the lateral nozzle is aligned with the foremost slot, high-pressure water sprayed by the lateral nozzle penetrates through the foremost slot to impact the coal seam, and high-pressure water sprayed by the axial nozzle pushes the oil pipe to retreat; when coal seam slotting at each slot is completed, water injection is stopped, and the oil pipe is pulled backwards; when the lateral nozzle is aligned with the next slot, the high-pressure water sprayed out of the lateral nozzle penetrates through the next slot to impact the coal seam, and the high-pressure water sprayed out of the axial nozzle still pushes the oil pipe to retreat; and the steps are repeated till coal seam slotting at the last seam groove is completed.

The invention discloses a high gas impact ground pressure mine island working face blasting pre-pressure-relief scour prevention method which comprises the steps that a scour inducing key layer in a top plate above an island working face is determined, a top plate pre-splitting pressure relief roadway with specific construction parameters is arranged in the scour inducing key layer, and by means of the mode, elastic deformation accumulated in the scour inducing key layer can be effectively reduced, and one-time pressure relief can be achieved; then, a plurality of blast holes with specific parameters are constructed from the roof presplitting pressure relief roadway to the inducing key layer, finally, the blast holes are sectioned according to the hole depth and sequentially blasted, energy release of each time of blasting is accurately controlled through sectioned blasting, meanwhile, continuous pressure relief is achieved in time and space through sectioned blasting, and the blasting efficiency is improved. The stress of the inducing key layer is effectively released to realize secondary pressure relief; through mutual cooperation of primary pressure relief of the roof presplitting pressure relief roadway and secondary pressure relief of segmented blasting of the blast hole, the mine roof type impact risk facing high gas, an island working face and mining rock burst is effectively reduced, and subsequent safe mining of the island working face is guaranteed.

Systems and methods are disclosed for mining lunar and Martian polar permafrost to extract gas propellants. The method can comprise identifying a plurality of near-polar landing sites in craters in which the surface comprises permafrost in perpetual darkness, wherein such landing sites have perpetual sunlight available at altitudes of about 100 to 200 m. A mining outpost can be established in at least one of the sites and a high altitude solar array deployed at the landing site using a lightweight mast tall enough to generate near continuous power for the outpost. Systems and apparatus are disclosed for mining the permafrost at the landing sites using radiant gas dynamic mining procedures. The systems can comprise a rover vehicle with an integrated large area dome for cryotrapping gases released from the surface and multi-wavelength radiant heating systems to provide adjustable heating as a function of depth.

The invention provides a hydraulic fracturing pressure relief method for a multi-layer thick and hard top plate of an extra-thick coal seam. The method comprises the steps that the rock stratum occurrence of the multi-layer thick and hard top plate is obtained through a top plate drilling method; based on a rock mechanics experiment method and a roof peeping method, the stability of the multi-layer thick and hard roof is evaluated, and a fracturing target layer in the multi-layer thick and hard roof is judged; directional drill holes are formed in the fracturing target layer according to the rock stratum occurrence; the fractured target layer is subjected to fracture forming in the directional drilling process through abrasive jet and staged fracturing; and the crack expansion range of the fractured target layer is monitored in real time based on the in-hole micro-seismic monitoring method, and fracturing construction parameters are dynamically adjusted according to the crack expansion range. According to the hydraulic fracturing pressure relief method for the multi-layer thick and hard roof of the extra-thick coal seam, by means of rock stratum testing before fracturing, determination of fracturing construction key parameters and monitoring after fracturing, the good pressure relief effect of the multi-layer thick and hard roof is guaranteed, and effective prevention and control of strong mine pressure disasters of the multi-layer thick and hard roof are achieved.

The invention discloses a perforation and fracturing combined operation integrated device and a fracturing method.The perforation and fracturing combined operation integrated device comprises a fracturing pipe, a packing assembly, a perforation assembly and a fracturing assembly, one end of the fracturing pipe is plugged, and the other end of the fracturing pipe is used for being connected with pump set equipment; the packing assemblies are arranged on the outer side of the fracturing pipe in the circumferential direction, and a perforation fracturing space is formed between every two adjacent packing assemblies. Each perforation assembly is located between every two adjacent packing assemblies, and each perforation assembly is provided with a nozzle and a first adjusting component; the fracturing assemblies are located between every two adjacent packing assemblies, each fracturing assembly comprises a fracturing hole and a second adjusting component, the fracturing holes are formed in the fracturing pipe, and the second adjusting components correspond to the fracturing holes. Perforating and fracturing are combined into a whole, the perforating procedure and the fracturing procedure can be seamlessly connected, the operation procedure is simplified, and the operation efficiency is improved.

The invention aims at providing a microwave-spalling agent in-situ fracturing device and method for mining rock through drilling, and belongs to the technical field of drilling mining. A rectangular waveguide and a circular waveguide are matched with a coaxial inner core to achieve focused radiation, directional initial fractures are generated in a drilled hole according to a preset angle, and the directional initial fractures are fractured; and then a static spalling agent is injected into the initial fracture in a segmented and partial pressure mode, in-situ secondary fracturing is conducted on the basis of the microwave fracturing range by means of the fracture expansion effect brought by expansion pressure, and secondary expansion of the fracture is promoted. And by superposing the fracturing ranges of the microwaves and the spalling agent, a large-area communicated fracture network mainly comprising microwave directional fractures is formed. Finally, on the premise that the fracturing range and effect are guaranteed, the purposes of reducing mining drill holes, increasing the distance between the drill holes and improving the mining efficiency are achieved.

The invention discloses comprehensive rock drift rapid tunneling equipment and a using method thereof.According to the tunneling equipment, a drilling and anchoring integrated multifunctional drilling machine is arranged on one side of a cantilever type tunneling machine body, and a temporary supporting mechanism is arranged above an oscillation cutting part; a deep hole is formed in a to-be-crushed rock by utilizing the multifunctional drilling machine, the deep hole is further expanded and cracked by utilizing the pulsating fracturing system, the strength of a rock mass is weakened, then the rock mass is milled by adopting the oscillating cutting part, and finally, the rock mass is anchored and protected by utilizing the multifunctional drilling machine and the temporary supporting device, so that a guarantee is provided for an operation environment. According to the equipment and the technology, a traditional roadway tunneling procedure is simplified into a continuous procedure, the tunneling efficiency of roadway rock mass is greatly improved, and meanwhile the cost is saved.

The invention discloses a whole-section hole circulation loading and unloading fracturing device and a coal mine hydraulic fracturing method. The whole-section hole circulating loading and unloading fracturing device comprises a fracturing pipe, hole sealing bags, a water injection pipe, a sliding pipe and a limiting assembly, a plurality of first holes are formed in the fracturing pipe, a fracturing space is defined between every two adjacent hole sealing bags, and the hole sealing bags communicate with the water injection pipe; the sliding pipe can move in an inner cavity of the fracturing pipe, one end, close to the bottom of the drill hole, of the sliding pipe is sealed, a second hole is formed in the sliding pipe, the first hole and the second hole are divided into a plurality of fracturing hole sets, each fracturing hole set comprises one first hole and one second hole, and when the first hole and the second hole in one fracturing hole set are communicated, the first hole and the second hole in the other fracturing hole set are communicated. The first holes and the second holes in the other fracturing hole groups are arranged in a staggered manner; the limiting assembly limits the position of the sliding pipe in the fracturing pipe and enables the first hole and the second hole in one fracturing hole set to be communicated. According to the method, fracturing equipment does not need to be moved, the fracturing process is simplified, and the hydraulic fracturing efficiency is improved.

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 discloses a combined well spacing method for a ground vertical well and an underground horizontal well, which comprises the following steps of: determining estimated fracturing information of the vertical well and estimated fracturing information of the horizontal well according to acquired fracturing construction information of a surrounding mine; the width of the to-be-mined working face and the lateral mining-induced fracture range of the mined working face are obtained, vertical well construction information is determined according to the width of the to-be-mined working face, the lateral mining-induced fracture range and vertical well estimated fracturing information, fracturing construction is conducted on the thick and hard roof based on the vertical well construction information, and the vertical well fracturing range of a ground vertical well is obtained; and horizontal well construction information is determined according to the horizontal well estimated fracturing information and the vertical well fracturing range, and fracturing construction is conducted on the impact main control rock stratum based on the horizontal well construction information. According to the combined well spacing method for the ground vertical well and the underground horizontal well, the well spacing scheme that the ground vertical well and the underground horizontal well are matched with each other is adopted, sufficient fracturing and pressure relief can be conducted on a thick and hard top plate, and cooperative prevention and control over rock burst and mine earthquake disasters are achieved.

The invention discloses a laser-electric pulse-water jet synergistic fluidized coal mining device and method, and the device comprises a gas extraction system which is used for extracting gas in the coal mining process; the laser perforation system is used for perforating the coal seam through a laser; the high-voltage electric pulse fracturing system is used for fracturing the to-be-fractured coal body between two adjacent perforations through high-voltage electric pulses to obtain a crushed coal body and a to-be-crushed coal body; the water jet coal breaking system is used for performing hydraulic cutting on the to-be-broken coal body to obtain a coal-rock mixture; the fluidization coal mining system is used for conveying the coal and rock mixture into the ground sedimentation tank to complete coal mining; and the backfilling system is used for backfilling the goaf with the gangue mixed mortar separated in the sedimentation tank. The coal mining technology under the synergistic effect of laser, electric pulse and water jet is adopted, accurate drilling and efficient crushing of a coal seam can be achieved, waste of water resources is reduced, and the coal mining efficiency is remarkably improved.

The invention discloses a method and system for designing the roof cutting height of coal-pillar-free self-forming roadway mining, and belongs to the technical field of coal mining, and the method comprises the following steps: according to the size of a stope, the advancing length of a working face and the thickness of an overlying strata top plate, analyzing the crushing and expanding characteristics of roof cutting caving rock mass through numerical simulation and similar simulation tests; on the basis of the crushing and swelling characteristics of the roof-cutting caving rock mass, the crushing and swelling amount of caving gangue in the bilateral roof-cutting range is calculated; and when the actual mining amount reaches the collapsed gangue crushing and swelling amount, the mining height at the moment serves as the optimal roof cutting height. According to the method, the collapse thickness of the overlying strata can be increased, more broken and expanded gangues are generated, the goaf can be fully filled, the broken and expanded balance of the overlying strata is realized, and the broken and expanded gangues are utilized to compensate the coal seam mining space, slow down the deformation of the overlying strata and relieve the damage to the surface ecological environment.

The invention discloses a coal measure stratum hard coal rock composite structure modifying and cracking system and method. The system comprises a cracking device arranged in a directional drill hole extending into a cracking area, a high-pressure pump and a hydraulic pump, wherein the high-pressure pump and the hydraulic pump are arranged in a coal seam roadway and inject a high-pressure cracking agent into the cracking device. The method comprises the following steps: 1, determining the position of a modified cracking area of the overlying strata of the coal seam; 2, determining drilling parameters; 3, obtaining a directional drill hole; fourthly, a fracturing device is installed, and the hole is sealed; 5, calculating the fracture pressure of the rock stratum and carrying out primary water fracturing; 6, liquid nitrogen reinforced cracking of the rock mass; and 7, judging whether the coal measure stratum hard coal rock composite structure modification cracking effect is achieved or not. On the basis of hydraulic fracturing, liquid nitrogen fracturing and mechanical auxiliary fracturing are introduced and ingeniously combined, meanwhile, the fracturing means can be autonomously adjusted according to different working conditions, the hard roof fracturing modes are enriched, the method has the advantages of being small in engineering amount, low in pollution, high in safety and high in working efficiency, and the cracking effect is enhanced.

The invention discloses a hydraulic pre-fracturing soundless cracking agent rock breaking method. The method comprises the steps that pre-fracturing drill holes are arranged; a hole packer injects water to seal holes; checking the sealing state of the debugging pipeline; performing water injection pre-fracturing and seam opening; pre-splitting drilling and draining; injecting a soundless cracking agent; waiting for the soundless crushing agent to break the rock; and the hole packer drains water and relieves pressure, and the next cycle is carried out. Presplitting control of the working face roof can be accurately achieved, it is ensured that safe and efficient natural collapse of the goaf roof is achieved, and potential safety hazards caused by goaf roof suspension are effectively weakened. The technical scheme is especially suitable for coping with complex geological conditions that the gate roadway roof rock stratum is hard and the goaf roof is difficult to naturally collapse, and has wide application prospects in roof management in the field of coal mining.

The invention provides a hard rock metal mine microwave and mechanical combined tunneling device and method.The hard rock metal mine microwave and mechanical combined tunneling device comprises a dynamic microwave radiation system and a static microwave radiation system, and the dynamic microwave radiation system comprises a first microwave generator, a first waveguide and a first microwave radiator; the first microwave generator, the first waveguide and the first microwave radiator are connected in sequence; the static microwave radiation system comprises a second microwave generator, a second waveguide and a second microwave radiator, and the second microwave generator, the second waveguide and the second microwave radiator are connected in sequence; the dynamic microwave radiation system and the static microwave radiation system are arranged on the tunneling device body. The dynamic microwave radiation system and the static microwave radiation system are arranged on the tunneling device body, so that the rock surface is fully fractured under the action of microwave radiation, and the hard rock cutting efficiency is improved.

A silent cracking agent and hydraulic fracturing coupling directional rock breaking method comprises the following steps: firstly, designing a rock mass fracturing scheme according to directional fracturing requirements, and then forming a drill hole in a rock mass; a directional joint-cutting silent crushing device is placed in the drill hole, and the orientation of a joint-cutting hole is adjusted, so that the orientation of the joint-cutting hole is aligned with the direction needing directional fracturing; injecting water required by the reaction of the soundless cracking agent into the drill hole through a hole packer; after water injection is completed, the hole packer is sealed, and the directional crack is formed after the internal silent cracking agent expands and fractures; after the directional crack is formed, water is injected into the drill hole again, and hydraulic fracturing is carried out; and after hydraulic fracturing is completed, the joint cutting rate is calculated, if the joint cutting rate reaches 90%, the rock breaking fracturing is completed, and if not, rock breaking is conducted again till the joint cutting rate meets the requirement. The directional pipe is used for controlling the expansion force direction of the soundless cracking agent to form directional cracks, and on the basis, the hydraulic fracturing technology is used for expanding the range of the cracks generated by the soundless cracking agent, so that directional joint cutting of the rock is achieved.

The invention discloses a double-injection double-sealing type silent cracking agent high-pressure rock breaking method, and relates to the technical field of hard roof weakening and high-stress roadway surrounding rock pressure relief. Water injection and double-end hole sealing are conducted through a drilling hole packer; checking the sealing state of the debugging pipeline; high pressure of a soundless cracking agent is blended and injected; waiting for the soundless cracking agent to expand and break the rock; and releasing the pressure of the hole packer and carrying out the next circulation. The method can achieve the effect of presplitting the working face roof, guarantees smooth caving of the goaf roof, reduces the risk of goaf roof suspension, is suitable for a working face with hard crossheading roof rock strata and a goaf roof cantilever not prone to caving, and has wide application prospects.

The invention provides a well position deployment construction method for a fractured horizontal well considering mine pressure treatment and gas extraction. The well position deployment construction method comprises the steps that firstly, a target key layer is determined; secondly, a ground L-shaped horizontal well is constructed; thirdly, hydraulic staged fracturing is conducted; step 4, reinjection; step 5, filling; sixthly, gas is extracted in a high extraction roadway; and 7, high-position drilling gas extraction is carried out. The method has the advantages of being controllable in drilling track, wide in influence area, low in construction cost and the like, rock burst can be effectively prevented and controlled, the problem that gas in a mining area and a goaf exceeds the limit is solved, meanwhile, the roadway tunneling work amount is reduced, and the purposes of reducing cost and improving efficiency are achieved. According to the method, multiple purposes are achieved through one well, treatment of the rock burst area of the deep coal seam is achieved, the gas extraction effect of a mining area in stoping and the gas extraction effect of a goaf after stoping are improved, and safe production of a mine is guaranteed.

A method for predicting solid material dislodgement due to explosive blasting, the method including: representing pre-blast solid material with a set of discrete particles, each with a 3D location and one or more mechanical properties of the solid material at that 3D location before the explosive blasting; representing at least one explosive blast with a blast time and a set of explosive particles, each with a 3D blast location in the pre-blast solid material and an initial internal energy; repeatedly, for a plurality of time steps, defining a 3D grid surrounding the discrete particles (e.g., plus two empty grid cells in each direction), and numerically determining / calculating updated velocities and updated 3D locations of the discrete particles based on the mechanical properties and the 3D locations, using the 3D grid; for at least one of the time steps corresponding to the or each blast time, including the explosive particles with the discrete particles to numerically determine the velocities and updated 3D locations of the discrete particles, and numerically determining / calculating the updated velocities and the updated 3D locations at the time steps after the or each blast time using the initial internal energies; and determining post-blast locations of the solid material using the repeatedly updated 3D positions of the discrete particles and the pre- blast solid properties of those discrete particles.

The invention discloses a heterogeneous hard rock stratum continuous excavation cutting control method based on a neural network. Comprising the steps of establishment and training of a deep neural network model, establishment and training of a convolutional neural network model, testing of pre-drilling fracturing operation, extraction and updating of fractured rock stratum characteristics, prediction and control of cutting specific energy consumption, pre-drilling fracturing operation and continuous mining operation. Performing visual identification on the working face of the strip mine and updating the second deep neural network model; the pre-drilling fracturing operation is controlled and adjusted according to the cutting ratio energy consumption index, and it is ensured that the cuttable performance of the heterogeneous hard rock stratum meets the requirement; by monitoring the actual cutting ratio energy consumption value in real time and updating the deep neural network model, the threshold value of the cutting ratio energy consumption is adjusted, and then the technical parameters of the cutting mechanism are adjusted, so that the real-time control and adjustment of the continuous mining operation are realized, and the economical efficiency and the high efficiency of the continuous mining operation of the strip mine in the heterogeneous hard rock stratum environment are improved.

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 belongs to the field of tunnel construction and the field of deep engineering disaster prevention and control, and provides a hydraulic and microwave combined insensitive hard rock burst prevention and control device which comprises a vehicle-mounted system, a hydraulic fracturing system and a microwave emission system. The hydraulic fracturing system is used for injecting water into the insensitive hard rock drill hole, forming a hydraulic fracturing crack on the circumferential wall surface of the insensitive hard rock drill hole, and then injecting a sensitive mineral proppant to fill the hydraulic fracturing crack; the microwave emission system is used for moving into the insensitive hard rock drill hole for microwave irradiation after the sensitive mineral proppant is injected; according to the method, hydraulic fracturing, microwave fracturing and sensitive mineral filling are combined and applied to fracturing and pressure relief of the insensitive hard rock of the deep tunnel, and due to the fact that sensitive minerals have high dielectric constants and dielectric loss factors, a good temperature rise effect can be shown under microwave irradiation.

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 relates to the technical field of mine underground equipment, in particular to crawler-type high-gas coal seam drilling equipment based on a double-channel drill rod, which comprises a walking chassis, the double-channel drill rod, a hydraulic slotting system and a negative pressure deslagging device. Crawler-type composite drilling equipment is provided, process integration is carried out through breakthrough of three core technologies, directional drilling (a diamond drill bit and a spiral groove drill rod), hydraulic slotting and negative pressure deslagging are integrated into single equipment, the working procedure switching time is shortened, synchronous slotting and deslagging operation is achieved through a double-channel drill rod, and the working efficiency is improved. The problems of energy consumption and blockage are solved; and meanwhile, gas accidents are prevented.

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 discloses a rock burst ultra-deep hole blasting unloading wave absorption coupling prevention method for a steeply inclined coal seam, and belongs to the technical field of coal mining, and the method comprises the following steps: step 1, determining an unloading target rock stratum where a working face top plate and / or bottom plate stress concentration area is located in the steeply inclined coal seam; 2, determining a wave absorbing target rock stratum between the unloading target rock stratum and a roadway on the corresponding side of the working face of the steeply inclined coal seam; 3, arranging a plurality of unloading blast hole groups in the roadway; step 4, arranging a wave absorbing blast hole group at the position where the unloading blast hole group is arranged in the roadway; 5, all the wave absorbing blast holes are detonated, and all the unloading blast holes are detonated; and 6, after blasting is completed, the near-surface surrounding rock of the roadway on the corresponding side subjected to blasting serves as a supporting bearing layer for combined supporting. According to the invention, a three-level cooperative control mechanism of source unloading, propagation weakening and terminal bearing is realized, and steeply inclined coal seam clamping type roof and floor rock burst disasters are prevented fundamentally.

The invention provides an underground large block secondary crushing device and method based on a robot platform. The device comprises a robot and an expansion cartridge, the robot comprises a robot seat, a drilling mechanical arm, a clamp mechanical arm, a depth camera and a container bin, a drill bit is installed at the tail end of the drilling mechanical arm, a clamp is installed at the tail end of the clamp mechanical arm, and the drilling mechanical arm, the clamp mechanical arm and the depth camera are all connected with a robot platform. The expansion cartridge is stored in the container bin. The mechanical arm is controlled through the robot platform, it is guaranteed that large rock is stably crushed in the complex and changeable underground environment, manual operation is reduced, production safety is guaranteed, and production efficiency is improved; a depth camera is used for accurately positioning the position of a large rock, the position of a blast hole is accurately positioned, and the accuracy of drilling and charging is guaranteed; rock breaking work is carried out through the expansion cartridge, and negative influences of blasting vibration and blasting shock waves on surrounding rock are avoided.

The present invention relates to the technical field of coal mining, in particular to a method for constructing an artificial water guide channel through drainage boreholes in a roof aquifer by means of pulse fracturing. The method involves arranging drainage boreholes and using pulse fracturing to pre-form an artificial water guide channel in a sandstone fracture aquifer through the arranged drainage boreholes, thereby improving the permeability of dense and intact sandstone rock masses; the artificial water guide channel formed by the drainage boreholes in the sandstone fracture aquifer connects discontinuous water-bearing areas and water-rich areas, such that roof sandstone fracture water‌ is guided to the drainage boreholes through the artificial water guide channel, thereby achieving effective drainage of the boreholes and expanding the drainage radiation range of a single borehole. The present invention not only avoids arranging excessive drainage boreholes and remarkably improves the drainage efficiency of exploratory drainage holes, but also achieves an advanced drainage function in a stoping process. By means of the method, mine water disasters can be effectively controlled even under unfordable geological conditions, thereby guaranteeing safe production at mines.