551results about "Disloding machines" patented technology

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

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

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

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

The invention 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 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.

The invention discloses an impacting-splitting-cutting composite rock breaking configuration of a cantilever type heading machine, relates to the field of coal mine underground heading equipment, and solves the problems of low efficiency, serious cutting pick abrasion, poor stability and insufficient adaptability of an existing heading machine during hard rock operation. A multi-stage cylinder executing mechanism is arranged on a cutting arm of the heading machine, an angle adjusting rotary table is arranged at the upper end of the multi-stage cylinder executing mechanism, and a breaking hammer and a rock cracking machine are arranged on the angle adjusting rotary table; the angle adjusting rotary table comprises a track plate and a rotary table, and the rotary table drives the track plate to rotate; a breaking hammer is arranged at one end of the track plate, and a rock cracking machine is arranged at the other end. The breaking hammer and the rock cracking machine are integrated at the front end of the heading machine, pre-broken rock can be split, the number of times of breaking is reduced, vibration and noise caused by repeated breaking are avoided, the internal stress of a rock stratum is damaged by additionally arranging the rock cracking machine, other work of the whole machine is not affected, and the service life of the heading machine is not affected.

The invention relates to a device for pre-damaging rock, comprising at least one microwave generator and at least one antenna unit (200) for introducing the microwaves into the rock (140), said antenna unit being connected to the at least one microwave generator (240) in a wave-conducting manner, wherein the microwave generator (240) is designed to generate microwaves having at least one wavelength, and the antenna unit (200) has at least two antennas (210). According to the invention, the at least two antennas (210) are arranged at an antenna distance (d) from one another such that the microwaves are constructively superimposed in the rock (140) such that at least one main power lobe (220) is formed in the rock (140) with the superimposition of the emitted microwaves, wherein the antenna distance (d) is dependent on the wavelength of the microwave generated by the microwave generator (240) in that the antenna distance (d) = m * the generated wavelength.

The invention relates to a rock stratum displacement monitoring method, device and system based on a multipoint displacement meter. The method comprises the following steps: obtaining preset measuring point distribution data by responding to fracturing operation, which is completed by utilizing a ground fracturing well, on a target weakening area corresponding to a goaf; based on the measuring point distribution information, drilling equipment is controlled to drill holes in the casing pipe, and a plurality of drill holes matched with the measuring point distribution information are obtained; each sensor node in the plurality of sensor nodes is connected with the signal receiver; aiming at each sensor node, mounting the sensor node into the corresponding drill hole; and acquiring monitoring data sent by each sensor node in real time by using the signal receiver, and determining the displacement monitoring information of the rock stratum based on the monitoring data. According to the scheme, the comprehensiveness and accuracy of rock stratum displacement monitoring are improved.

The invention relates to a hydraulic slotting and fracturing integrated collaborative operation system, and belongs to the technical field of coal mining. The system comprises a multi-parameter three-dimensional monitoring module, a multi-mode cooperative control module, a hydraulic fracturing module and a hydraulic slotting module. The multi-parameter three-dimensional monitoring module is used for carrying out crack three-dimensional modeling, stress field dynamic tracking and gas component real-time analysis; the multi-mode cooperative control module analyzes the geological exploration data output by the multi-parameter three-dimensional monitoring module to obtain geological parameters, and generates an operation scheme according to the geological parameters; and the hydraulic fracturing module and the hydraulic slotting module cooperatively work under the control of the multi-mode cooperative control module. Through the integrated collaborative design of hydraulic slotting and fracturing, the limitation of a single process is broken through, the construction efficiency and uniformity of a crack network are improved, the stability and coverage range of a gas extraction channel are improved, and a full-process intelligent solution is provided for safe and efficient mining of a complex coal seam.

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

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

The invention relates to the technical field of hydraulic fracturing, in particular to a drilling, sealing and fracturing integrated hydraulic fracturing device for a directional drilling machine. The high-low pressure switching mechanism in the device can achieve the functions of low-pressure passing and high-pressure sealing, and a good guarantee foundation is provided for hydraulic fracturing operation. When the device is used, under the condition of low-pressure water, the piston core cannot completely compress the first spring, at the moment, the high-pressure and low-pressure switching mechanism in the device is in an access state, and the low-pressure water is introduced to the position of a drill bit to assist drilling. When hole sealing and fracturing operation is carried out, high-pressure water is introduced into the hollow drill rod, the piston core is gradually pressed by the high-pressure water, the first channel and the second channel are disconnected from each other, and the high-low pressure switching mechanism is in a closed state; high-pressure water is introduced into the hole sealing and fracturing mechanism and is sprayed out of the fracturing hole in a high-pressure state, so that the hydraulic fracturing effect is achieved; in other words, the device can achieve integrated operation of drilling, sealing and pressing, and the construction efficiency is greatly improved.

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

A splitting machine wedge block set with double lubrication comprises a middle wedge block, side wedge blocks and a wedge block installation base, the rear end of the wedge block installation base is connected with a guide cylinder, a lubrication cavity is formed in the rear end of the wedge block installation base, an oil sealing rubber block and a spring are arranged in the lubrication cavity, the lubrication cavity is sealed by a gland plate, and a lubricating grease filling port is formed in the side wall of the guide cylinder. Lubricating grease in the guide cylinder can lubricate the surface of the middle wedge block on the inner side of the guide cylinder, lubricating oil channels composed of main oil channels, oil inlet holes and oil outlet holes are formed in the inner sides of the two side wedge blocks respectively, and the main oil channels are formed by extending from the rear ends of the interiors of the side wedge blocks to the front ends of the interiors of the side wedge blocks. The oil inlet hole extends inwards from the outer wall surface of the rear end of the side wedge block to be communicated with the rear end of the main oil duct, the multiple oil outlet holes extend outwards from the inner side surface of the side wedge block to be communicated with the main oil duct, and the oil supply pipe can inject lubricating grease into the oil inlet hole. By adopting the structure, the inner side of the wedge block mounting seat, the middle wedge block and the side wedge blocks are always automatically lubricated by the lubricating grease, so that the service life of the wedge block group can be greatly prolonged.

The invention relates to the technical field of mine coal mining, in particular to a roof fracturing and blasting roof cutting composite pressure relief method which comprises the following steps: determining the position of a surrounding rock impact ground pressure master control or mine earthquake master control rock stratum above a coal seam in a mining area; detecting and ensuring that the gas concentration of the underground area is within a preset range, performing combination of one of ground vertical well fracturing, ground horizontal well fracturing and underground long drill hole segmented hydraulic fracturing on rock burst main control or mine earthquake main control rock strata of surrounding rock above a coal seam and underground deep hole presplitting blasting, and performing reinforced support on a working surface of a mining area. According to the roof fracturing and blasting roof cutting composite pressure relief method, hydraulic fracturing and deep hole blasting are combined to relieve pressure of rock burst master control and mine earthquake master control rock stratums in an overlying roof so as to improve the pressure relief effect.

The invention relates to a rock stratum movement monitoring method, device and system based on a ground fractured horizontal well. The method comprises the steps that after fracturing operation on a target weakening area corresponding to a goaf is completed through a ground fracturing well, laying equipment is controlled to lay an optical fiber sensor into the ground fracturing well in a U shape; the optical fiber sensor is attached to the well wall of the ground fractured well; grouting equipment is controlled to inject concrete grout into the ground fractured well, so that force conduction can be directly conducted between an optical fiber sensor in the ground fractured well and a rock stratum where the optical fiber sensor is located; sending an input detection signal to the optical fiber sensor by using a signal transceiver, and receiving an output detection signal returned by the optical fiber sensor by using the signal transceiver; and determining the fiber Brillouin frequency drift distance of each position on the fiber sensor based on the output detection signal, and determining a rock stratum motion monitoring result corresponding to the goaf based on the fiber Brillouin frequency drift distance. According to the scheme, the accuracy of rock stratum activity monitoring is improved.

The invention discloses a steeply inclined thin vein non-explosive continuous mining method based on a TBM (Tunnel Boring Machine), and solves the problems that corner ore bodies are difficult to dispose, the turning radius of the TBM is limited and the mining efficiency is influenced when the TBM is applied to underground ore body mining in the existing method. Ores are conveyed to a mining area draw shaft through a belt for ore removal, supporting equipment matched with a TBM is used for supporting, unmined ore is recycled through corner ore bodies generated in the TBM tunneling process, a spiral slope ramp is arranged at the end of each ore body, and small-radius turning of the TBM is achieved; according to the method, the problems that underground turning of the TBM is difficult and the TBM is difficult to enter the next layer for mining are solved by additionally arranging the spiral ramp layer changing project; the walking problem of the TBM when the next layer is stoped is ensured; and a non-metal supporting material and TBM supporting equipment are adopted, so that the stoping of the next layer is not influenced on the premise of safety, and the mining efficiency is improved.

The invention relates to the technical field of underground mining methods, and provides a coal mine rock stratum directional fracturing construction method adopting a directional fracturing device, which comprises the following steps: S1, prefabricating the directional fracturing device; the directional fracturing device comprises a fracturing pipe; the fracturing pipe comprises a tubular body which is formed by oppositely splicing a first semicircular pipe wall and a second semicircular pipe wall which are the same in size into a whole. The directional fracturing device further comprises a fracturing pipe connecting piece. S2, drilling operation is carried out; s3, preparing a water-soluble film medicine bag; s4, filling a water-soluble film medicine bag; s5, a directional fracturing device is installed; s6, hole sealing treatment is carried out; step S7, dissolving the water-soluble film; s8, directional fracturing is carried out; and S9, the charging hole is blocked, and the construction site is cleaned. The method is particularly suitable for a static expanding agent directional fracturing device based on the water-soluble film packaging technology, and is suitable for engineering scenes such as mining, tunneling and building demolition which need to accurately control the rock stratum fracture direction.

The utility model discloses a rock splitter which comprises a cylinder body and a sliding cavity arranged on the lower portion of the cylinder body, two splitting blocks are connected in the sliding cavity in a sliding mode, plugging plates fixedly connected with the cylinder body are arranged on the two sides of the sliding cavity, and a telescopic wedge block is tightly attached between the splitting blocks. A plurality of oil outlet holes are formed in the contact surfaces of the corresponding wedge blocks and the splitting blocks, the oil outlet holes communicate with oil conveying channels in the splitting blocks, the upper portions of the oil conveying channels are connected with oil conveying branch pipes capable of synchronously moving with the splitting blocks, the oil conveying branch pipes extend to the outer portion of the sliding cavity and are connected with oil conveying hoses, and the two oil conveying hoses are converged to be connected with an oil conveying main pipe; the oil conveying main pipe is communicated with the automatic oil filling pump. According to the utility model, the contact surface between the splitting block and the wedge block is provided with the oil outlet hole, the oil conveying channel, the oil conveying hose and other structures which are communicated with the automatic oil filling pump, so that the lubricating oil does not need to be manually smeared, the tedious process and workload are reduced, the working efficiency is improved, and meanwhile, the safety risk caused by accidental starting of equipment possibly caused by manual smearing is avoided.

The invention belongs to the field of rock burst prevention and control coal mining methods, and particularly relates to a roof-cutting pressure-relief coal mining method under the stratum condition of a deeply-buried sandstone group. Comprising the following steps: respectively constructing detection drill holes inside and outside a first mining working face, and checking an interface in a stratum in a hydraulic pressure test mode so as to accurately determine a key layer. On the basis, on the basis of gob-side entry retaining, roof cutting drill holes are creatively constructed in a roof cutting special roadway and a transportation roadway correspondingly, so that roof cutting work is conducted on key layers in a bent sinking zone rock stratum, a water flowing fissure zone and a caving zone rock stratum in a roof; therefore, the suspended roof length of a part of the water flowing fractured zone rock stratum and the caving zone rock stratum is reduced but still reserved, the supporting force needing to be borne by the gob-side entry retaining is reduced, and a sheltering space is provided for the gob-side entry retaining. The bent sinking zone rock stratum is subjected to vertical drilling top cutting, and a top cutting transition area is reserved, so that superposition of fracture of the bent sinking zone rock stratum and fracture of the water flowing fissure zone rock stratum can be reduced, and the stratum pressure needing to be borne by gob-side entry retaining is reduced to the maximum extent.

The invention discloses a precise weakening method for horizontal section fully-mechanized caving mining of extra-thick top coal in a nearly-vertical coal seam. The method comprises the following steps: field parameter acquisition: investigating and surveying to obtain a coal and rock stratum comprehensive histogram and a geological structure; performing three-dimensional non-contact measurement to obtain surface and internal fracture distribution of the top coal; performing an indoor mechanical test to obtain top coal and roof rock mechanical parameters; and actually measuring the lumpiness distribution of the top coal. And building a three-dimensional geomechanical model by using numerical simulation software according to field parameters, wherein the three-dimensional geomechanical model comprises the steps of defining a geometrical shape, setting physical and mechanical parameters, configuring boundary conditions and setting an initial state. And operating the model to simulate advanced blasting, monitoring the bearing capacity of broken top coal, and judging a difficult caving area. Directional blasting is designed according to the distribution of the strong chains in the difficult caving area, and the explosive dosage and the charging mode are adjusted according to the number of the strong chains. And after blasting, the lumpiness distribution of the released top coal is monitored, the explosive amount is fed back and optimized according to the weakening effect of the top coal, and a subsequent blasting scheme is adjusted.

The present invention relates to a technical solution of unloading pressure and shocking preventing, achieved by 3D stratified buffer and energy absorbing belt in thick coal seam. It is a technology for Prevention and Control of the Impact of Ground Pressure in Coal Mines that with Thick Coal Seam Bottom Roadway. Firstly, determine the distribution length L of the supporting stress curve along the advancing direction of the working face, divide the independent impact prevention unit by L, and sequentially determine the length L1 of the stress elevation zone, the length L2 of the stress critical load zone, the length L3 of the stress decline zone, and the length L4 of the stress static load zone, and also determine the different parameters of the spacing of the cutter drilling holes within the different stress zones; In the vertical direction of the working face, determine the height of the coal body stress stabilization zone H1, the height of the stress increase zone H2 and the height of the stress superposition zone H3 in turn, and determine the parameters of the cut slits and the location of the blocking grooves in different zones within the different stress zones. The appropriate jet parameters are adopted in different stress areas, and barrier slots are formed by continuous cutting at the junction of different partitions, which can both perform the function of coal unloading and block the stress transfer, solving the problems of insufficient and uneven unloading of coal seams.

The invention discloses a hydraulic fracturing ground stress testing device and method, and relates to the technical field of hydraulic fracturing, and the hydraulic fracturing ground stress testing device comprises testing equipment. According to the hydraulic fracturing ground stress testing device and testing method, through the design of testing equipment, a water source enters the water pump pipe from the water inlet pipe, water flow is sprayed outwards from the nozzle in the water pump pipe, so that the hydraulic fracturing effect is achieved, the rotating mechanism is driven to rotate through flowing of the water flow, and the effect of cleaning the inner wall of a pipeline through friction is achieved; the rubber pipe is extruded by sliding the packing top block on the packing base, so that the rubber pipe is extruded and deformed to be attached to the surface of soil, the packing effect on a test part is achieved, the silica gel column is arranged in the rubber pipe, the silica gel column has a certain supporting effect and prevents a part from being concaved inwards and collapsed, and the rhombic film is arranged on the outer side of the rubber pipe, so that the rubber pipe is prevented from falling off. Therefore, surface friction force of components is increased, service life of the components is prolonged, and friction load is dispersed.

The invention discloses a hard roof directional long drill hole supercritical carbon dioxide fracturing device which comprises a hollow drill rod, a drill bit is fixed to the tail end of the drill rod, the portion, close to the drill bit, of the drill rod is sleeved with a fixing cylinder, spray holes communicated with the interior of the drill rod are distributed in the side wall of the fixing cylinder, and the outer wall of the fixing cylinder is sleeved with a first sealing ring; a movable barrel is arranged between the fixed barrel of the drill rod and the drill bit in a sleeving manner; a second sealing ring is arranged on the outer wall of the movable barrel in a sleeving manner; compared with the prior art, drilling and fracturing functions can be accurately switched by controlling the rotating direction of the drill rod, the sealing reliability and the action synchronism are ensured, and the efficiency and safety of fracturing operation are greatly improved.

The present invention regards a detonator support device (1) configured for internally supporting an elongated detonator unit (3), the detonator support device (1) exhibits an upper end (5) and a lower end (7) and comprises a first elongated sidewall (9) hingedly coupled to a second elongated sidewall (11) via a hinge member (13), a latching member (15) of the detonator support device (1) is wall (11) in a closed state. A first cord clamping surface (17) of the first elongated sidewall (9) is configured to come in position opposite a second cord clamping surface (19) of the second elongated sidewall (11) in said closed state for engagement with at least one cord member (21). The present invention further regards a method of preparing a detonator support device and a blasting system (100).

The invention discloses a near-driving working face high-pressure hydraulic fracturing advanced pressure relief anti-scour device which comprises a fracturing pipe, a plurality of fracturing holes are formed in the pipe wall of the fracturing pipe, a sealing bag frame used for separating the adjacent fracturing holes is further arranged on the outer wall of the fracturing pipe, a first inner guide pipe is installed on the inner wall of the fracturing pipe through a first through-flow ring frame, and self-adaptive fracturing nozzles are arranged in the fracturing holes; an oscillation mechanism is arranged on the outer wall of the inner conduit I; the perforation pipe is connected with the pipe cavity of the inner guide pipe I, a plurality of jet flow holes are formed in the pipe wall of the perforation pipe, and a temporary blocking mechanism for separating adjacent jet flow holes is further arranged on the outer wall of the perforation pipe.