69 results about "Overburden" patented technology

The invention particularly discloses a rock-soil body interface torsional shear characteristic and toughness parameter unit body test device which comprises a unit body sample blank manufacturing device, a centering device, a special drilling tool, a rib body and a torque load.The rock-soil body interface torsional shear characteristic and toughness parameter unit body test device has the beneficial effects that traditional direct shear / drawing shear is replaced with torsional shear loading; the problem that the interface contact area is reduced in the shearing process is thoroughly solved, it is ensured that the interface contact area of an anchor / pile and a rock-soil body is constant, a pressure water bag is arranged at the top of a test box unit body, the original overlying and confining pressure environment of a stratum is accurately simulated, a test anchor hole / pile hole is directly manufactured through a drilling technology, and the natural roughness characteristic of the hole wall is reserved to the maximum extent; the smooth wall surface limitation of traditional mold pore forming is broken through, the basic toughness concept of the anchor / pile-rock-soil body interface is defined for the first time, the nature of the basic toughness can be quantitatively represented by the robustness of the shear resistance of the interface, a matched toughness testing technology and evaluation method are developed, and a theoretical model and a calculation tool are provided for the toughness design of anchoring engineering and pile foundation engineering.

The invention discloses a multi-dimensional comprehensive evaluation method for permeability resistance of overlying strata of a working face, and belongs to the technical field of mine engineering and geological safety evaluation. 12 types of core factors such as rock strength, rock core quality, physical and mechanical properties of rock mass, hydrological properties and mining influence characteristics are integrated; a full-process evaluation framework of data acquisition, index system construction, weight distribution, comprehensive modeling and verification optimization is constructed, an analytic hierarchy process and an entropy evaluation method are coupled to determine index weights, a dynamic evaluation model is constructed in combination with a fuzzy mathematics theory, and accurate classification and risk early warning of the permeability resistance of the overlying strata are realized. According to the method, through comprehensive analysis of a plurality of factors, the accuracy of overlying strata permeability resistance evaluation can be improved, so that the underground water permeation path and the permeation amount are predicted more accurately, the uncertainty is reduced, the comprehensiveness and the accuracy of evaluation are remarkably improved, and a scientific basis can be provided for mine water disaster prevention and control and safe mining.

The invention relates to the technical field of coal mining, and discloses an overlying strata multi-key layer composite pressure relief method and device, electronic equipment and a storage medium. Comprising the following steps: acquiring multi-mode rock stratum information of each overlying rock stratum of a target mining area; key strata in all the overlying strata are judged through the multi-mode strata information of all the overlying strata; based on the lithology and the mechanical property of each key layer, determining a pressure relief mode of each key layer; and determining pressure relief parameters of each key layer based on the pressure relief mode of each key layer. According to the method, the load distribution of each rock stratum is quantitatively calculated to judge the bearing capacity of each overlying rock stratum so as to preliminarily screen the key layer candidate layer, the fracture distance of the key layer candidate layer is further calculated to judge the fracture critical condition of each key layer candidate layer, and finally the key layer is screened out, so that the reliability of a key layer judgment result can be improved, and the judgment accuracy of the key layer is improved. It is ensured that the determined key layer is the optimal pressure relief layer position, and the economic benefit and efficiency of pressure relief construction can be improved.

The invention relates to the technical field of deep dynamic disaster control, and discloses an overlying strata low-position pressure relief and high-position filling dynamic disaster coupling control design method which comprises the following steps: dividing strata units of a research area; and a low-position pressure relief model is established, and crustal stress balance calculation is carried out. And deep hole blasting schemes with different blasting parameters are designed, and circulating excavation and balance calculation are conducted on the coal seam till coal seam excavation is completed. Monitoring points are arranged on the overlying strata of the low-position pressure relief model, and a dynamic change curve of rock mass stress and displacement is obtained. And meanwhile, position coordinates of upper and lower rock stratum boundaries of the separation space are screened, and a grouting material unit conforming to the separation space form is generated. Proportional segmentation is carried out according to a grouting area, and different grouting filling rates are set; and designing a grouting material unit, and creating a high-position filling model. And comparing numerical results of different low-position pressure relief models and high-position filling models, carrying out coupling design on the two numerical models, and designing an optimal dynamic disaster coupling control scheme.

The invention discloses a mining area water diversion fissure zone top boundary blocking and water reducing method for preventing fissure reexpansion, which comprises the following steps: determining a grouting water interception and emission reduction treatment area of a mining area, judging the type of a water diversion fissure, and taking an upward opening fissure and a closed fissure as grouting areas; the method comprises the following steps: based on the constraint of a critical range of safe compressive strength of a consolidation body of grouting pressure and grouting liquid, on the basis of determining development characteristics of the water flowing fractures and a target grouting range, performing grouting plugging on a weathered bedrock layer where the top boundary of the water flowing fractured zone is located, by means of the method, exploring channel seam searching-filling plugging-stable water-resisting layer rebuilding is achieved, so that slurry leakage is reduced, the grouting cost is reduced, and the conditions of water guiding fracture reexpansion and loose phreatic aquifer water loss are effectively restrained; the technical problems that secondary damage is caused to overlying strata of a coal seam roof and the water plugging effect is poor due to the fact that in a crack plugging method in the prior art, the grouting pressure and the specific gravity of grout are difficult to grasp are solved.

The application discloses a kind of underground gas storage cavern depth calculation method based on expansion and crack failure in the technical field of high-pressure gas storage cavern, comprising the following steps: assuming that the failure mode of the overburden of gas storage cavern under the action of internal gas pressure is expansion and crack failure, cracks along one side of the gas storage cavern, the overburden rotates and lifts around the origin of the other side, calculates the lifting torque and anti-lifting torque with the origin, and establishes the torque balance equation, constructs the correlation calculation formula of the gas pressure in the cavern and the minimum burial depth and distance coefficient, and calculates the numerical value of the minimum burial depth of the cavern using the trial method, and the calculation accuracy meets the engineering requirements. Under the premise of ensuring the safety of the gas storage cavern, the minimum burial depth of the cavern can be accurately calculated, thereby saving investment and shortening the construction period, and the engineering benefit is remarkable.

The present application relates to a kind of subway tunnel excavation construction overburden lateral settlement prediction method, belong to subway tunnel technical field.The present application can effectively utilize the actual monitoring data in subway tunnel excavation construction, carry out the correction of Peck theory formula and the training of neural network, realize the lateral settlement prediction of overburden of mountain city subway tunnel excavation construction, provide basic data for the demarcation of subway excavation construction settlement influence range and support structure design.

The application discloses a kind of continuous monitoring methods of coal mine mining overburden rock three-dimensional interstice, belong to coal mining technical field.Through coal mine overburden rock multi-position separation layer monitoring device measurement coal seam mining after the three-dimensional interstice of overburden rock: based on coal seam mining thickness and water conducting fractured zone development height, formulate mining overburden rock interstice monitoring scheme;Perpendicular monitoring borehole is arranged on the surface above the stoping working face, and coal mine overburden rock multi-position separation layer monitoring device is installed in the borehole;Real-time acquisition, storage and analysis monitoring data are acquired by data acquisition box and computer;Based on the advancing distance of coal mining face, the evolution law of single-hole interstice of mining overburden rock is analyzed;Kriging interpolation method is used to predict the unknown point interstice of working face according to the multi-hole monitoring data, and the spatial curved surface visualization model of mining overburden rock interstice is generated.The application can realize the continuous monitoring of the distribution characteristics of overburden rock three-dimensional interstice in the process of coal seam mining, and provide a scientific basis for determining the key parameters of grouting and filling.

The invention relates to the technical field of coal mining, in particular to a thick coal seam internally-staggered roadway mining method which comprises the following steps that a first mining working face is arranged, specifically, an air return roadway of the first mining working face is located on a coal seam top plate, and the middle portion of a cutting hole of the first mining working face is located on a coal seam bottom plate; the return airway facing the first mining working face climbs at a preset gradient; the bottom coal is reserved according to the gradient set by the open-off cut of the first mining working face; a transportation roadway of the post-mining working face is located on a coal seam bottom plate and arranged below bottom coal reserved on the pre-mining working face, and the middle portion of a cut of the post-mining working face climbs towards an air return roadway of the post-mining working face at a preset gradient; according to the mining method, section coal pillars are canceled, the mining rate is increased, meanwhile, uneven sinking of overlying strata and the development height of a water guiding fracture zone are effectively controlled, and efficient and low-loss mining of the thick coal seam is achieved.

The application provides a goaf overburden strata settlement calculation method based on internal damage characteristics of overburden, and the method comprises the following steps: obtaining a detection image; determining a fractal description of a damage variable by using a digital image processing technology and a fractal box covering method according to the detection image; calculating a crack area distribution weight of overburden at different depths, and determining an optimal fractal box size according to a relationship between an information space dimension and a box covering fractal dimension; determining a fractal damage constitutive model by determining an overburden body damage factor according to the fractal description of the damage variable and the optimal fractal box size; calculating additional stress of overburden at different depths according to a stress balance principle, and calculating the settlement of overburden at different depths by using a layer summation method. By using the fractal damage constitutive relationship, the application constructs a goaf overburden strata settlement calculation model, so that the settlement of overburden at different depths is calculated, the calculation precision is improved, and the purpose of calculating the goaf overburden settlement by using the fractal theory is achieved.

This invention relates to the field of image analysis technology, and more specifically, to a method for extracting and analyzing the dynamic range of images of damaged landforms in mining areas. The method includes: Step 1: Integrating the multispectral radiance within a set wavelength range, while subtracting two atmospheric scattering terms at each wavelength point to obtain the corrected reflectance; Step 2: Multiplying the Euclidean distance by the curvature amplitude in the near-infrared band to obtain a spectral collapse-curvature index sensitive to browning / chlorosis; Step 3: Calculating the peak elastic strain energy density per unit area of ​​overburden-coal mass; Step 4: Extracting all linear cracks from remote sensing images of the same time period and statistically analyzing their orientation histograms, then using the Shannon entropy formula to calculate the anisotropic entropy modulation of the cracks, thereby constructing a comprehensive dynamic range damage index to characterize the degree of damage to each pixel. This invention achieves accurate identification and intensity classification of surface damage areas under mining disturbance in mining areas.

The present application relates to the technical field of rainfall seepage physical simulation, and particularly relates to a rainfall seepage physical simulation experiment platform and an experiment method, comprising a base, a photogrammetry point, a Perspex baffle, a platform frame, a similar simulation coal rock stratum, a seepage monitor, a computer, a second plastic water pipe, a wastewater tank, a camera, a moisture sensor and a filter assembly, and the top outer wall of the base is fixedly connected with the platform frame; the present application is simple in experiment work, convenient in operation, high in practicability and safety, and accurate in obtained data, is suitable for a coal seam mining simulation experiment process under rainfall conditions, can obtain physical parameters such as a migration law of overburden rock, a development law of mining fissure and rainfall seepage characteristics in a coal seam mining process under rainfall seepage conditions; simulation experiment data is monitored in real time through a three-dimensional photogrammetry system and a coal rock stratum seepage monitoring system, the influence of other factors on the similar simulation experiment data is reduced, and the stability and accuracy of the data are ensured.

The application provides a kind of intelligent discrimination and enhancement method of effective barrier layer under aquifer protection in mining area, and belongs to the technical field of water-preserved mining.The method obtains geological parameters and coal rock mass physical and mechanical parameters of multiple experimental mines, uses 3DEC numerical simulation to simulate the fracture morphology of overburden rock after mining, establishes a water resource seepage model combined with COMSOL Multiphysics software, and calculates the water resource intrusion depth.Then, the relevant parameters are taken as input, the water resource intrusion depth is taken as output, the SVM model is trained to build an intelligent discrimination model of barrier layer water resource seepage, and then the water resource intrusion depth is predicted and the effective barrier layer thickness is calculated combined with the safety factor.The effective barrier layer is discriminated and processed according to different conditions.The application uses the above-mentioned intelligent discrimination and enhancement method of effective barrier layer under aquifer protection in mining area, discriminates and enhances the water-resisting capacity of the effective barrier layer, and realizes the protection of water resources in mining area.

This application relates to the field of dam foundation seepage prevention and reinforcement construction technology, and in particular to a construction process for an ultra-deep dam foundation overburden seepage barrier wall. The process includes using a rotary drilling rig to drill along the axis of the seepage barrier wall, sequentially lowering multiple spliced ​​casings in sections, clearing the soil inside the casings, pouring concrete to form in-situ concrete piles, and before the concrete has initially set, connecting the grouting equipment and air source to the cement grout nozzle and air nozzle respectively, adjusting the casings so that the cluster injection assembly faces the adjacent pre-set piles, lifting and removing the casings in sections, and using the cluster injection assembly to directionally inject grout to form the seepage barrier wall. This application achieves the technical effect of forming a tightly overlapping seepage barrier wall in the ultra-deep dam foundation overburden layer, effectively solving the seepage problem, and being able to cope with obstacles in the strata, ensuring construction quality and effectiveness.

The invention belongs to the field of coal mine filling mining, and particularly relates to a one-side goaf overlying strata grouting filling green coal mining method which comprises the steps that a plurality of goaf grouting drill holes close to a coal wall supporting area are constructed in a mined working face; constructing a grouting filling system; injecting gangue mixed slurry into the goaf; gob-side entry driving is carried out on the reserved section coal pillar, and the width of the section coal pillar can meet the requirement that under auxiliary supporting of a goaf filling body, the section coal pillar is kept stable after working face stoping and before basic roof caving, and the section coal pillar is unstable after basic roof caving; the goaf grouting drilling holes are changed into separation layer grouting drilling holes; a plurality of separation layer grouting drill holes are constructed in the working face to be stoped; a grouting filling system is connected with the separation layer grouting drill hole; and the working face to be stoped is stoped, and grouting filling is conducted on the self-grouting drill holes. According to the method, the stress of the section coal pillar can be reduced, so that the reserved width of the section coal pillar is reduced, the coal loss is reduced, the grouting filling amount of the separation layer can be ensured, and the gangue absorption amount is ensured.

The invention relates to the technical field of compressed air energy storage, in particular to a burial depth design method and device based on a three-dimensional circular truncated cone fault optimization model and a medium, and the burial depth design method comprises the following steps: S1, determining design parameters of a gas storage; s2, substituting the design parameters into a three-dimensional rigid circular truncated cone model to calculate the burial depth H1; s3, whether the fault intersects with the overlying rock mass of the gas storage or not is judged, and if not, the burial depth H1 in the S2 serves as the safe burial depth H; if yes, the burial depth H2 is calculated by adopting a three-dimensional circular truncated cone fault optimization model; the method can make up for the blank of burial depth calculation models of unfavorable geologies such as large tank type gas storage faults and the like, and solves the problems that an existing calculation model cannot consider the influence of the faults, and the fracture surface at the fault intersection is not estimated accurately. Meanwhile, the invention provides a method for evaluating the position relation between the fault and the overlying rock mass of the gas storage and calculating the size of the fault influence area, so that the burial depth calculation result is more reasonable and reliable.

This invention provides a method for constructing sheet pile cofferdams in rocky areas with thin overburden. The method involves drilling pre-holes at designed locations on a construction platform using a pre-drilling device, followed by backfilling the boreholes with red clay. Multiple guiding mechanisms are installed inside the construction platform, and sheet piles are then driven using a pile-driving device, with the sheet piles positioned against the guiding mechanisms during driving. High-pressure jet grouting is used to seal and reinforce the sheet piles from the bottom upwards. Water is pumped out of the cofferdam, and internal supports are installed layer by layer from top to bottom. The foundation pit is excavated to the designed elevation, a cushion layer is poured, and the foundation cap is constructed. Sand is backfilled between the foundation cap and the sheet piles, and the bottom layer of internal supports is removed before constructing the pier body. The method of pre-drilling, backfilling, and high-pressure jet grouting establishes a consolidated system between the sheet piles and the rock. Backfilling sand between the foundation cap and the sheet pile cofferdam completes the first system transition. This method features a simple structure, clear stress distribution, and safe construction.

The present application relates to the field of coal underground gasification analysis, and relates to a simulation analysis method for heat transfer behavior of coal underground gasification under the condition of multiple thin coal seams. The present application divides the grid of each geological layer by the thickness of each geological layer in the target gasification coal seam and its overburden, initializes each parameter of each unit, analyzes the exothermic competition weight based on the endothermic and exothermic reaction rate of the target gasification coal seam, and further determines the net reaction heat source term, updates the temperature of the grid unit based on the net reaction heat source term of each unit, identifies the endothermic and exothermic alternating zone and locates the heat spot center in combination with the exothermic competition weight; the trajectory curvature and heat spot moving speed are obtained based on the associated heat spot center of adjacent time points, and the gasification stability is evaluated; the connected desorption domain is divided based on the overburden temperature, and the desorption window is divided according to the average temperature of the connected desorption domain at each time point, the heat action intensity index and effective desorption volume of each desorption window are calculated, and the basis for analyzing the methane thermal desorption is provided.

The invention provides a two-zone three-dimensional visualization and water disaster assessment method for weakly cemented overlying strata, and relates to the field of coal seam roof water disaster prevention and control, and the method specifically comprises the following steps: carrying out mine data collection and hydrogeological data analysis, and establishing a basic data set; coal mining overlying strata motion law analysis is carried out, and two-zone height data are obtained; establishing a coal seam roof three-dimensional hydrogeological structure model; importing the calculated'two-zone 'height data into a coal seam roof three-dimensional hydrogeological structure model, and establishing a'two-zone' three-dimensional visual hydrogeological structure model; cutting, rotating and removing the obtained'two-zone 'three-dimensional hydrogeological structure model, and performing three-dimensional visual analysis; and performing mining coal seam roof water disaster risk assessment according to the overlying strata two-zone and water-resisting layer-containing space distribution characteristics. According to the technical scheme, the problems that in the prior art, the overlying strata two-zone development height cannot be rapidly calculated, and the roof water inrush threat degree cannot be accurately evaluated are solved.

This invention relates to the field of marine engineering and structural health monitoring technology, specifically a three-dimensional identification method for overburden fissures in submarine tunnels. When there are no fissures in the propagation path between the acoustic signal transmitter and receiver, the received signal is stable; however, when fissures exist in the path, the received signal will show significant attenuation or a sharp drop. This invention achieves online, rapid, and accurate detection of overburden fissures in submarine tunnels through a multi-source spatial superposition identification algorithm based on acoustic attenuation characteristics. Utilizing the principle of multi-path superposition, it can eliminate single-path measurement errors and improve positioning accuracy. The system has a high degree of automation, can quickly acquire and process signals, and meets the online monitoring needs during construction. The equipment is flexible in installation; the transmitter only needs to be placed outside the overburden layer, reducing modifications to the internal structure of the tunnel.

The invention discloses a method and a system for controlling the movement range of overlying strata in coal mining, a storage medium and computer equipment, and the method comprises the following steps: determining a to-be-protected earth surface target area and a corresponding underground coal mining area, the coal seam burial depth and the overlying strata strength corresponding to the underground coal seam mining area and the earth surface movement angle corresponding to overlying strata movement caused by coal seam mining are obtained; an overlying strata cutting mode is selected based on the overlying strata strength, the overlying strata cutting mode comprises a vertical cutting mode and an inclined cutting mode, when the overlying strata strength falls into the soft rock range, the overlying strata cutting mode is determined to be the vertical cutting mode, and when the overlying strata strength falls into the hard rock range, the overlying strata cutting mode is determined to be the inclined cutting mode; on the basis of the overlying strata cutting mode, overlying strata cutting parameters are obtained, and according to the coal seam burial depth, the earth surface movement angle and the overlying strata cutting parameters, the size of a protection coal pillar after overlying strata cutting is carried out is calculated; and according to the size of the protection coal pillar, overlying strata cutting construction is executed so as to control the overlying strata moving range.

This invention relates to the field of quantitative analysis of mining-induced fracture evolution in coal and rock masses, and particularly to a method for quantitatively characterizing the distribution and evolution of mining-induced fractures in overburden in loess gully areas based on fractal theory. The method involves measuring data from the 6102 face of the Chuancaogedan Coal Mine using a measuring instrument, and then establishing a physical similarity simulation model based on the 6102 working face. Simulated excavation is performed, with the simulation data set as follows: 5# coal seam mining height 4.6m, excavation step distance 10m, model recovery length 220m; 6# coal seam mining height 12.9m, excavation step distance 10m, model recovery length 220m. Based on the results of the physical similarity simulation experiment and fractal theory, this invention systematically studies and quantitatively describes the distribution and evolution of mining-induced fractures in overburden under multiple influences in loess gully areas. This has significant theoretical and engineering implications for revealing the laws governing overburden movement and damage, achieving quantitative evaluation of the degree of overburden damage during mining, and preventing damage during working face mining.

The present application provides a kind of mine overburden structure migration comprehensive monitoring system and method, it is related to overburden migration monitoring technical field, comprising: data acquisition module continuously acquires the overburden characteristic parameter of each area, the change of each area overburden characteristic parameter is carried out data processing by identification module, obtains total displacement change and displacement direction angle, identifies the area of highest strain energy density, data processing and analysis module generates deformation index and deformation consistency index, comprehensive analysis module processes each index, generates comprehensive evaluation index, judgment module compares comprehensive evaluation index with preset threshold, to judge the risk level of mine overburden.The present application covers each dimension of overburden deformation comprehensively, solves the one-sidedness of data acquisition;With the help of continuous data acquisition for multiple times, dynamic tracking is realized, and by constructing evaluation index, effectively make up for the lack of data acquisition continuity and comprehensiveness, significantly improve the accuracy of overburden migration risk judgment, realize scientific and comprehensive evaluation.

The present application belongs to the field of coal mining strata damage and movement control and mining area ecological protection. Specifically relates to a unified topological model and method for representing the evolution of overburden rock fracture field under different geological conditions. The core of the present application is to establish a unified topological model for describing the spatial distribution of overburden rock fracture field under different geological conditions. The topological parameters in the model can be quantitatively calculated according to the overburden structure and mechanical parameters, breaking through the bottleneck that most parameters in traditional rock movement prediction model are empirical values. According to the overburden strata supporting pressure and mechanical parameters of different layers monitored by optical fiber arranged in mine hydrological hole, the inflection point layer and concave-convex nature of overburden rock fracture field are determined, and the evolution form of overburden rock fracture field under different geological conditions is obtained. The unified topological model is used to represent the distribution of overburden rock fracture field, and whether there is a separation zone and its layer in the overburden rock fracture field is determined, which scientifically guides the accurate grouting in the separation zone to control the surface subsidence and protect the mining area ecology.

The present application relates to a kind of thick aquifer under grouting reinforcement impermeable range quantitative delineation method, belong to coal mining technical field, comprising: obtaining the hydrogeological data and rock strength parameters of mining area;Overburden failure is predicted and simulated, and the maximum height of water flowing fractured zone is obtained;Based on grouting reinforcement test, in combination with the hydrogeological data and rock strength parameters, the minimum thickness of required grouting layer is obtained;Based on the maximum height of water flowing fractured zone and the minimum thickness of required grouting layer, the three-dimensional space range of grouting reinforcement layer is determined.The present application combines mine foundation hydrogeological condition, realizes the effective determination of grouting layer minimum thickness and three-dimensional range by mathematical model and numerical simulation, ensures that grouting layer meets the reinforcement impermeable demand while avoiding excessive design.On this basis, combined with dynamic verification and feedback adjustment mechanism, further improve the safety and economy of grouting reinforcement impermeable.

The invention discloses a close-distance coal seam working face staggered arrangement and partial filling collaborative alternate mining method, and belongs to the field of coal mining. The method aims to solve the problems of stress superposition, difficult settlement control, low resource recovery rate and low mining efficiency in simultaneous mining of close-range coal seam groups, and comprises the following steps: designing relative spatial positions of working surfaces of upper and lower coal seams to be staggered, and during mining, pausing after the working surface of the upper coal seam is advanced by a set staggered distance L, and starting the mining of the lower coal seam; and then the parallel operation of bottom mining and top filling-top mining and bottom filling is alternately and circularly carried out between the upper working face and the lower working face. According to the method, the overlying strata is uniformly and effectively supported by the filling body, the reserved width of the section coal pillar is compressed to 0-10 m, the overlying strata is promoted to uniformly settle, the ground surface settlement gradient is reduced to below 0.05%, parallel operation of different steps is simultaneously executed through the two sections of working faces, the mining efficiency is remarkably improved, and the mining cost is reduced. And the comprehensive operating rate of the equipment is improved from below 65% to above 85%.

The invention discloses a drainage anti-blocking and microorganism strengthening method for a grouting goaf. The drainage anti-blocking and microorganism strengthening method comprises the steps that water exploration and drainage drilling construction is conducted; installing a water detection and drainage anti-blocking device; a water exploration and drainage scheme is used for drainage; removing an anti-blocking device and deploying a pipeline; and injecting microorganisms to consolidate the dense coal gangue slurry. According to the method, excessive drainage and drainage coal gangue and low prevention efficiency can be effectively prevented, meanwhile, after the coal gangue slurry is solidified, the thickness of overlying strata is equivalent to that of artificial increase, the safety of the lower coal seam during stoping is remarkably improved, and the effect is particularly obvious when an extremely close distance coal seam group is mined.

The invention provides an overlying rock deformation monitoring system and method for caving discrete cemented filling mining, and relates to the technical field of mining engineering. A key monitoring area is determined by calculating the caving height, a filling hole is reused to install a quick-release modular strong magnetic buckle in a non-fixed mode, a monitoring device is distributed in a U-shaped mode, grouting and embedding are conducted, a solar power supply system and an optical fiber 5G signal wireless transceiver are installed, and monitoring and remote data analysis are conducted. The method can be used together with an original filling hole of a mine, the project of drilling a monitoring drill hole additionally is avoided through one hole with two purposes, and meanwhile, the time and the expenditure cost are saved only by arranging the optical fiber stress-strain sensor in a key monitoring area; only one optical fiber is arranged and installed in a non-fixed U shape by adopting a quick-release modularized strong magnetic buckle, so that the optical fiber can be flexibly installed, is easy to separate and can be tightly coupled with a rock stratum, and the deformation of the overlying rock mass of the metal mine exploited by adopting a discrete cemented filling method is efficiently monitored.

The invention belongs to the technical field of hydrate physical property measurement, and provides a reservoir hydrate mining simulation visualization device which comprises a model box, a simulation reservoir and an upper covering layer are sequentially arranged in the model box from bottom to top, a pressurization assembly is arranged between the upper covering layer and the top of the model box, and a temperature control assembly is arranged on the outer side of the model box; the exploiting assembly comprises an exploiting well, the bottom of the exploiting assembly communicates with the simulated reservoir, the exploiting assembly is further provided with a hydrate generating part and a gas collecting part, the hydrate generating part and the gas collecting part communicate with the top of the exploiting well, the hydrate generating part is used for introducing methane into the simulated reservoir, and the gas collecting part is used for collecting a gas-liquid mixture generated through decomposition in the simulated reservoir; and the scanning observation assembly is used for acquiring an internal structure image of the simulated reservoir. The method has great significance in accurately simulating the silty clay reservoir shear zone evolution process and revealing the mechanism of reservoir settlement induced by hydrate exploitation, and provides a basis and a technical support for stability evaluation and settlement prevention and control of hydrate exploitation engineering.

The utility model relates to the technical field of coal mines, in particular to a liftable guide pipe for coal mine overlying strata separation layer grouting settlement reduction, which comprises a guide pipe, the guide pipe is connected with a first connecting pipe and a second connecting pipe in a penetrating manner, the first connecting pipe and the second connecting pipe are rotatably connected with a round block, and two ends of the side of the round block are connected with a plurality of groups of sliding blocks. An inner gear is fixedly connected to the inner wall of the circular block and is in meshed connection with three sets of gears, a motor is connected to the top end of one set of gears, a motor fixing frame is arranged at the top end of the motor, and the top end of the motor fixing frame is fixedly connected to the top end of the interior of the first connecting pipe; by means of the electric rotating table, the winding wheel, the rope and the scraping plate, automatic cleaning of the inner wall of the guide pipe is achieved, blocking and scaling are effectively prevented, the service life of equipment is prolonged, the grouting effect is optimized, and maintenance work is simplified.