1209results about "Material fill-up" patented technology

The invention discloses a double-row medium-length hole blasting method for a filling stope. According to the method, a theoretical value range of each blasting parameter is deduced according to field engineering practice, an ore rock blasting crushing mechanism and a blasting parameter theoretical formula. The method comprises the following steps of: constructing a stope blasting model with different hole bottom distances, explosive unit consumption and resistance line combinations by using ANSYS numerical simulation software in combination with physical and mechanical properties of ore rocks and field explosive performance parameters, and preferably selecting double-row medium-length hole blasting parameters according to a chamber effective stress distribution rule and a roof area vibration velocity peak value of the ANSYS blasting model. According to the method, by selecting the double-row optimal medium-length hole blasting parameters, it is guaranteed that ore rocks in the chamber are fully crushed, the effective stress invading the roof and the blasting vibration velocity peak value are reduced, and the roof is prevented from being damaged. And meanwhile, the explosive loading amount is reduced, the economic cost is reduced, and the production efficiency of a mine is improved.

The invention provides a coal seam sandstone roof water retention coal mining method with control while mining based on mining-induced fracture grouting. The coal seam sandstone roof water retention coal mining method comprises the steps that hydrogeological parameters of a target working face of a coal mine are obtained; according to the hydrogeological parameters, determining a roof fracture step pitch of the target working face, determining stratum distribution characteristics above the target working face, and determining simulated development characteristics of a flowing water fractured zone of the target working face; determining a grouting horizon according to the simulated development characteristics of the water-flowing fractured zone and the formation distribution characteristics; the target working face is subjected to stoping, and after the stoping distance reaches the roof fracture step pitch every time and the roof of the target working face is fractured, layered grouting is conducted on the grouting layer position corresponding to the target working face in the roof fracture step pitch till stoping of the target working face is completed completely. And after layered grouting of all the grouting layers corresponding to the target working face is completed, operation is finished. The coal seam sandstone roof water retention coal mining method with control while mining based on mining-induced fracture grouting is high in safety and water control mining efficiency, and resources are saved.

The invention discloses an efficient filling method for an underground small goaf group, and the method comprises the steps: constructing a three-dimensional model through laser radar scanning, and marking a communication relation and the stability of a top plate; dividing the goaf group into a main filling area and a secondary filling area, and designing a fractal topological structure drainage channel to form a gravity flow network; preparing filling slurry taking a cementing material, tailings and the like as main materials, and controlling parameters such as slump, initial setting time and the like; then, stepped pressure self-adaptive filling is adopted, slurry is injected in two stages, and the pressure and the flow speed are controlled; according to the method, the problems that traditional filling blind areas are large in number, material waste is serious and efficiency is low are solved, low-pump-pressure global coverage is achieved, the roof contact rate is remarkably increased, safe and efficient mining of mines is guaranteed, the comprehensive cost is reduced, and the method is suitable for underground small goaf group filling.

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 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 belongs to the technical field of industrial solid waste resource recycling, and discloses a nano composite filling material based on in-situ acid-base mutual modification enhancement and application thereof. According to the nano composite filling material, the alkalinity of the red mud and the acidity of the desulfurized gypsum are used for neutralization, the alkalinity of a system is reduced, a synergistic reaction is excited, a large number of ettringite crystals playing a key enhancing role are generated under the regulation and control of a nano material, and the ettringite crystals and a geopolymer form an interpenetrating network structure. The obtained slurry is low-viscosity and high-fluidity Newtonian fluid (diffusivity gt and 250 mm), the 7-day strength is larger than 2.0 MPa, the pH value is 7-9, and the fluorine ion concentration is lt; and the leaching of heavy metal ions is qualified, and the method is environment-friendly and safe. Efficient resource utilization of the red mud and the desulfurized gypsum is achieved, and the method is simple in process, low in cost and especially suitable for mine filling and engineering backfilling.

The invention relates to the technical field of underground mining of metal ore deposits, in particular to a staged ascending pillar-free large-diameter deep-hole lateral caving subsequent filling mining method, which comprises the following steps of: dividing a steeply inclined medium-thickness ore body into a plurality of stages, and dividing large and small stopes in the stages without leaving pillars; digging a flat-bottom ore removal structure at the bottom of the stope, and digging a rock drilling chamber at the bottom of the stope at the upper stage; digging a cutting well at the end part of the stope and expanding the cutting well into a cutting groove; large-diameter parallel deep holes are drilled downwards in the rock drilling chamber, and lateral ore caving is carried out with cutting grooves as free faces; the caved ore is transported out by a carry-scraper through the flat-bottom ore removal structure; and the stope goaf is subjected to subsequent cemented filling. The small stopes are firstly stoped and filled with the 1: 4 full-tailing cementing material, and after the small stopes are solidified, the large stopes are stoped and filled with the 1: 20 full-tailing cementing material. The method has the characteristic of ascending stoping among stages, and has the advantages that pillar-free continuous stoping is realized, and the rock drilling chamber is used as a flat bottom ore removal structure to be reused.

The invention discloses a coal mining water retention method, which comprises the following steps of: pre-calculating the height h0 of a water flowing fissure zone in a deep aquifer when the water yield Q2 of a coal mining mine is equal to the total water consumption Q1 of production and life of a mining area, and then calculating the corresponding mining height M0 when a coal seam below is mined according to the height h0 of the water flowing fissure zone; according to the mining height M0, the filling height M2 needing to be equivalently filled in the goaf is calculated, and materials are filled into the goaf behind along with advancing of the coal face during coal mining until the materials reach the height of M2, so that too high or too low development of the water flowing fissure zone can be inhibited, the filling height or thickness can be reduced, and the filling efficiency is improved. According to the method, the balance between the filling height of the goaf and the development height of the water flowing fractured zone is found in an equivalent filling mode, mine water generated during coal mining can meet the total water consumption of production and life of a mining area, the defects caused by complete filling can be avoided, the coal mining efficiency is improved, and the water retention effect is also improved.

The invention provides a downward parallel medium-length hole sublevel filling mining method for a low-grade broken ore body, belongs to the technical field of mining, and solves the problems that a traditional mining method is low in mining efficiency and high in cost under complex geological conditions. Downward parallel medium-length holes are adopted in each section for drilling and blasting, efficient stoping is achieved in cooperation with remote control ore removal and supporting equipment, an interbed filling technology is adopted in a goaf to be combined with a reinforcing mesh structure to form an artificial roof, stress and displacement changes of a filling body are monitored in real time through a ground pressure monitoring system, and the stoping sequence and supporting parameters are optimized. According to the method, the efficiency and safety problems of a traditional mining method in low-grade and broken ore deposit and three-under resource mining are solved, large-scale, low-cost, safe and efficient mining is achieved, and the method is suitable for ore body mining under complex geological conditions.

The invention belongs to the technical field of mining construction, and particularly relates to an artificial roof structure and a construction process thereof. The construction process comprises the steps that S1, anchor rod holes are constructed in the positions, 1 m away from a bottom plate, of two sides of a stope, S2, ore cushion layers with the thickness of 200 mm are laid and leveled, S3, I-shaped steel bottom beams are erected and fixed through round steel anchoring parts and welding base plates, S4, a reinforcing mesh is laid, main ribs and auxiliary ribs are bound in a crossed mode and welded to anchor rods, according to the composite structure design of the double-layer reinforcing mesh, the steel wire mesh and the hanging bar system, a three-dimensional stress system is formed, the bending resistance and the shearing resistance of the false roof are remarkably improved, the problem that a traditional false roof is prone to cracking and sinking is solved, and the false roof has the advantages of being simple in structure, convenient to use, economical and practical. Due to the layered matching design of the full-tailing cemented filling body, the bearing strength is guaranteed, seamless roof contact is achieved, the risk of roof hollowing is reduced, the pressure of stope operation circulation is relieved, the ore removal efficiency is improved, and the mining cost is reduced.

The invention belongs to the technical field of coal mine green mining and disaster prevention and control, and particularly relates to a caving area gangue grouting and filling method for recycling underground coal mine water resources. And zero emission and efficient cyclic utilization of water resources are realized. The coal gangue is used as a main filling aggregate and is directly digested underground, so that the problems of land occupation and environmental pollution caused by ground stockpiling are avoided, and harmless and large-scale treatment of the coal gangue is realized. A water treatment system and a gangue treatment system are combined into a whole, the comprehensive operation cost of a mine in the aspects of water disaster prevention and control, gangue treatment and outsourcing of a water source is remarkably reduced through a cyclic operation mode, and the cost benefit is high. Accurate detection and effect verification of the previous and later ponding areas are carried out through a geophysical prospecting means, and measures such as directional drilling and safety monitoring are combined, so that controllability and safety of the whole operation process are ensured, and the safety and reliability are high.

The invention relates to a monitoring, prevention and control system for filling and pipe plugging, which comprises a ground integrated console, a distributed optical fiber acoustic monitoring system, a pressure detection mechanism and a discharge mechanism, and is characterized in that the ground integrated console is electrically connected with the distributed optical fiber acoustic monitoring system, the pressure detection mechanism and the discharge mechanism through a communication system, and data connection is established; at least one distributed optical fiber acoustic monitoring system and at least one pressure detection mechanism are connected with the pipe wall of the filling pipeline and distributed in the axis direction of the filling pipeline, and the discharging mechanism is connected with the filling pipeline. The use method comprises the following four steps: optical fiber laying, system operation flow, pipe blockage judgment and active prevention and control, and mechanism maintenance. Precise positioning of the pipe blocking position can be achieved, the pipe blocking area is determined in combination with the acoustic signal spatio-temporal evolution law, active regulation and control of filling and pipe blocking are achieved through the pressure release valve and the vibration ring, the problem of response lag caused by traditional manual troubleshooting or single-parameter triggering is solved, and the timeliness of field emergency disposal is improved.

The invention discloses an underground mine goaf filling body strengthening and subsequent mining joining method, and relates to the technical field of mine mining. Comprising the following steps of intelligent filling body construction and reinforcement, multi-source fusion intelligent monitoring and digital twinning construction, data-driven subsequent mining dynamic intelligent decision making and energy regulation and control, targeted restoration and collaborative ecological reconstruction. The intelligent filling body is made of the shape memory polymer fibers and the nanometer piezoelectric ceramic particles, the layering process is combined to improve the strength and real-time state feedback, the safety and durability of the filling body are remarkably improved, the high-fidelity digital twinborn model is constructed in a fused mode, intelligent decision making and active wave absorbing regulation are linked, and the stability of the filling body is improved. The subsequent mining efficiency can be effectively improved, the damage risk of the filling body can be effectively reduced, in addition, the damage area is accurately positioned through the unmanned aerial vehicle, directional grouting repair is conducted, heavy metal is solidified through microorganisms, solid waste is recycled, the resource utilization rate in the mining process is increased, and the environmental burden is reduced.

The invention belongs to the field of coal mine underground goaf filling methods, and particularly relates to an ultra-long working face goaf inclined strip filling method. According to the method, a plurality of working faces are taken as a group, and fracturing roadways are arranged outside all the working faces. An inclined fracturing roof cutting area is constructed in the basic roof through the fracturing roadway, and the fracturing roof cutting area is constructed into a caving rock mass with fracturing broken waste rock on the two sides, a roof cutting block in the middle and the two inclined sides adjacent to a complete rock stratum. Then, the top cutting block bodies are used as a grouting diffusion face to conduct grouting on the fracturing broken waste rocks around the top cutting block bodies, and a plurality of inclined supporting strips which have high supporting capacity and are formed by mixing the broken waste rocks, the top cutting block bodies and slurry are formed; and the subsidence of the overlying sandstone group is controlled, and rock burst is prevented. Afterwards, the remaining fracturing drill holes, the remaining top cutting drill holes and the remaining grouting drill holes are used for conducting goaf filling on the follow-up working face in sequence, and therefore the problem that the construction work amount of long drill holes of the ultra-long working face is large is solved.

The invention discloses an inorganic normal-temperature rapid-hardening coal-rock mass reinforcing and filling material, and relates to the technical field of mine reinforcement. The material comprises a liquid A and a liquid B, the liquid A is prepared from cement, fly ash, magnetic nano silicon dioxide, citric acid and a layered bimetal oxide-sodium hexametaphosphate compound; and the liquid B comprises water glass, superfine limestone and water. During use, the liquid A and the liquid B are mixed according to the volume ratio of 1: 1 and injected into a target area, and a 1.5 Tesla magnetic field is applied at the initial stage of grouting until the grout is initially set. Through the synergistic effect of the compound protection dispersing agent, the magnetic particles and an external magnetic field, the technical problems that an existing material is unstable in performance due to temperature change, nanoparticles are prone to agglomeration, and magnetic response is attenuated in an alkaline environment are effectively solved; the technical effects of rapid solidification, high strength and excellent durability in high-temperature, low-temperature and complex mine environments are achieved.

The utility model provides a building type crushing and filling system which comprises a crushing building which is arranged to crush materials and convey the materials which are crushed to have preset granularity to a finished product warehouse building; the finished product warehouse building is provided with a finished product tank used for receiving the materials with the preset granularity, and a discharging opening of the finished product tank is communicated with a filling device; and the filling device is arranged to mix the material from the finished product tank with the mixed additive and then convey the mixed material to a goaf or an accident pool. According to the utility model, the layout of each device is more reasonable, and the occupied space is smaller; the integrated full-process continuous operation including material crushing and filling can be realized; and when maintenance and change are needed, assembly can be directly carried out by taking a building as a unit, so that the influence on other equipment is reduced.

The invention discloses a ternary solid waste gelling system mine cemented filling material, a preparation method and application, phosphogypsum and water-quenched slag powder are used as main gelling components, carbide slag is used as an exciting agent, and phosphate tailings and phosphorus tail mud are used as filling body aggregate to form the high-content phosphogypsum ternary solid waste gelling system mine cemented filling material. Wherein the ternary solid waste gel system comprises the following components in percentage by weight: 10-18% of carbide slag, 36-54% of ardealite and 36-54% of water-quenched slag powder, and the ratio of ardealite / (ardealite + water-quenched slag powder) is 0.4-0.6. The mine cemented filling material disclosed by the invention is prepared by taking solid wastes of industrial byproducts of a phosphorite mountain and the periphery of the phosphorite mountain as main raw materials, and the mechanical property of the prepared filling slurry after solidification needs to meet an engineering filling strength index, so that efficient resource utilization of a large amount of industrial solid wastes for phosphorite resource development can be realized; good mechanical properties and remarkable economic and environmental benefits are achieved.

The invention relates to the technical field of mining engineering, in particular to a gently inclined ore body stoping and roof management method, which realizes cooperative control in the mining process by deeply fusing layered interval stoping, a composite filling technology and an intelligent monitoring-adaptive support system. A degradable fiber reinforced material and a novel filling formula are adopted, a distributed optical fiber-stress sensor mixed monitoring network and a top plate stability dynamic evaluation model are combined, the problems that traditional supporting is low in reliability, monitoring lags behind, ground pressure management is difficult and the like are effectively solved, compared with the prior art, the supporting cost can be reduced by 40%-60%, the filling efficiency is improved by 30%-45%, and the supporting effect is good. The mining safety and the resource recovery rate are obviously improved.

The invention discloses a ground directional drilling goaf passing leaking stoppage method which comprises the steps that hole data of a goaf are obtained, and the hole data comprise the hole depth and the crack width; when the width of the crack is larger than 5 mm, a foundation plugging material is adopted for conducting foundation plugging on the hole of the goaf, and the foundation plugging material is an inert material and cement paste; judging whether basic plugging fails or not to obtain a first judgment result; if the first judgment result shows that the basic plugging fails, a flexible plugging material is adopted for conducting medium-term plugging on the holes in the goaf, and the flexible plugging material is a material formed by mixing hemp fiber, sawdust, soybeans and water. According to foundation plugging, a large channel is filled through particle bridging, a primary plugging layer is formed after cement paste is solidified, the flexible material can adapt to trace deformation of surrounding rock through deformation filling, and micro cracks of a foundation layer are plugged. Through graded gradient filling, the leaking stoppage effect can be greatly improved.

The invention discloses a metal mine space carbon sequestration system and method based on upward filling of a segmented stope. A closed filling chamber is arranged in a staged blasting stope between a lower-stage filling body and an upper-stage unblasted ore body; an upper-stage drift roadway is arranged between the top of the closed filling chamber and the upper-stage unexploded ore body; a horizontal filling pipeline and a CO2 horizontal filling pipeline which are used for conveying the filling slurry and the CO2 gas to the closed filling chamber are arranged in the upper-stage access roadway, and the CO2 gas is mineralized to realize carbon sequestration through the filling slurry and the CO2 gas in the closed filling chamber. According to the method, the closed filling chamber is arranged in the goaf of the metal mine to seal and store the CO2 gas, the CO2 is utilized to be subjected to carbonization reaction with clinker minerals and hydration products in the filling cementing material, so that the dual purposes of'filling reinforcement 'and'filling carbon sequestration' are achieved, and environmental pollution cannot be generated in the whole CO2 gas sealing and storing process.

The invention discloses an active treatment method for multi-source residual coal gas of a waste mine, which comprises the following steps: firstly, hydraulic fracturing pressure relief permeability improvement and overlying strata separation layer grouting reinforcement are cooperated, the hydraulic fracturing pressure relief permeability improvement establishes a netted fracture network in a coal body to realize permeability improvement, and the overlying strata separation layer grouting reinforcement compacts goaf gangue through grouting and reinforces an overlying strata to form a continuous bearing consolidation body; and therefore, a pressure relief and permeability increasing-strengthening and reinforcing integrated structure is formed, a stable structure and a penetrating seepage network are provided for subsequent displacement and gas extraction, and the subsequent gas extraction efficiency is guaranteed. Then low-temperature liquid CO2 is injected into the coal seam through the injection well, gas displacement and desorption are conducted on gas adsorbed in the coal seam under the action of phase change and competitive adsorption, expansion and development are conducted on fractures to enable permeability to be secondarily enhanced, and meanwhile part of CO2 obtained after displacement is retained and sealed in a coal body and a goaf; on the premise that the gas extraction concentration and efficiency are effectively improved, CO2 can be stored, and the dual effects of resource utilization and carbon storage are achieved.

The invention discloses a tunnel forepoling method, and relates to the technical field of tunnel forepoling, the tunnel forepoling method comprises the following steps: identifying fracture distribution, fracture zone position and scale in a tunnel rock mass, and obtaining geological information of the rock mass in front of a tunnel face; obtaining construction parameters according to the geological information; according to the construction parameters, drilling, pipe shed mounting, steel strand inserting and tensioning and grouting in the surrounding rock are conducted, and a reinforcing area is formed; and stability monitoring is conducted on the reinforced area, and the reinforced area serves as a tunnel advance support. According to the method, the three-dimensional geomechanical model is constructed through multi-source geological detection to guide construction parameter optimization, precise construction control and real-time stability monitoring are combined, and the problems of inaccurate geological information, extensive parameter design and monitoring deficiency in a traditional supporting technology are solved; the reliability of the forepoling structure is improved, the construction risk is reduced, and the engineering cost is saved.

The invention relates to an upward horizontal layering full barren rock filling mining method for a multi-layer parallel steep dip ore body, which comprises the following steps of: panel division: dividing the ore body into a plurality of middle sections, segmenting and layering, dividing each middle section into a plurality of panels along the trend of the ore body, and further dividing each panel into a plurality of stoping units from an upper panel to a lower panel; performing mining preparation roadway arrangement and cutting engineering: performing roadway arrangement by taking outside-vein mining preparation as a main part in the mining preparation engineering, so as to form a mining ore removal channel and a ventilation system; the cutting project is a cutting roadway. And stoping and filling are conducted, specifically, stoping is conducted layer by layer from bottom to top in each panel, stoping is conducted one by one from the upper panel to the lower panel through the stoping units of the same layer, and stoping and filling of the upper layer are started after stoping and filling of the layer are completed. Through the technical means of panel division, accurate mining roadway arrangement, mining and filling circulation collaborative operation, full barren rock filling and the like, the production efficiency of the mine is remarkably improved, and the filling cost is reduced.

The invention discloses a segmented echelon intelligent filling method and system for unit dense filling, and relates to the field of unit dense filling technology.The method comprises the steps that a goaf to be filled is divided into a plurality of continuous filling segments, and each filling segment is divided into a plurality of echelons; the same-level echelon of each filling subsection is filled in sequence; based on real-time resistivity data collected by the resistivity sensor array, the slurry liquid level height is determined by combining a pre-constructed slurry state prediction model, and the slurry liquid level height is controlled to be filled to the single filling height; based on the real-time resistivity data and the slurry state prediction model, the slurry condensation state of the current gradient is determined, and when the slurry condensation state is initial condensation, filling operation of the next gradient continues to be executed; when the slurry liquid level height of each filling section reaches a preset roof contact value, slurry filling is stopped, and roof contact operation is executed; therefore, the filling process is controllable, the slurry state can be intelligently judged, and the filling precision is improved.

The invention discloses a method for mining and supporting a downward inverted trapezoidal long drift of a steeply inclined thin vein, and belongs to the technical field of mine engineering. A horizontally arranged main connection way is used as a shared connection way of other layers in a section, so that an opening area of the connection way of the next layer is located in the connection way of the previous layer, and meanwhile, the opening position is controlled; projections of all the openings on the main connection way are not overlapped, and projections of all the layered connection ways in the vertical direction are not completely overlapped. For the non-adjacent stopes, the opening of the connection way is arranged in the adjacent layered connection way closest to the main connection way, so that the repeated tunneling workload is reduced through roadway sharing, the engineering construction cost is directly reduced, and the construction period is directly shortened; meanwhile, by means of the design that the staggered openings and the vertical projection are not completely overlapped, the situation that all the layered connection ways form continuous empty areas in the vertical direction is avoided, surrounding rock stress is dispersed, and the problem that in the prior art, surrounding rock is broken due to stress superposition is solved.

The invention relates to the technical field of mining, and discloses a high and large stope barren rock and tailing cemented filling body artificial false bottom and a manufacturing method thereof. The artificial bottom comprises a framework structure, a waste rock layer and a tailing cementing material layer; wherein the skeleton structure comprises an upper-layer reinforcing mesh structure, a lower-layer anchor mesh structure and a steel fiber rope for connecting the upper layer and the lower layer; the skeleton structure is filled with the waste rock layer; gaps between the framework structure and the waste rock layer are filled with the tailing cementing material layer. According to the high and large stope barren rock and tailing cemented filling body artificial false bottom and the manufacturing method thereof, underground barren rock is used as main aggregate, the using amount of a cementing agent is greatly reduced, a reinforcing mesh-barren rock-cementing slurry composite flexible structure has extremely high mechanical performance, the maintenance period is remarkably shortened, the construction efficiency is improved, and the construction cost is reduced. And the construction cost is reduced.

The invention provides a grouting support reinforcement method and system for a gob-side entry retaining large-deformation roadway, and relates to the technical field of coal mine roadway surrounding rock control and grouting reinforcement. According to the method, mining-induced stress and deformation characteristics are analyzed by constructing a numerical simulation model, a plastic zone range is recorded in combination with a monitoring section, and a reinforcement area and grouting opportunity are determined based on dynamic weight evaluation; and according to the height of the plastic zone and the integrity of the surrounding rock, the drill hole arrangement is designed in a self-adaptive mode, the grouting pressure and the grout dosage are calculated, the termination condition is controlled according to the pressure and flow change in the grouting process, and accurate and reliable reinforcement of the large-deformation roadway surrounding rock is achieved.

The invention discloses a mining separation layer crack filling method based on a ground comb type directional drilling group. The mining separation layer crack filling method comprises the following steps that (1) the position of each key layer is determined; (2) selecting a proper key layer as a grouting layer position; (3) establishing a numerical calculation model by adopting numerical simulation software, and simulating and analyzing the evolution law of the separation layer in the advancing process of the coal face; (4) a drill site is arranged outside the influence range of the mining area, and a main hole for ground comb type directional drilling is constructed; (5) designing a branch hole track of the ground comb type directional drilling by using Landmark software; (6) a ground comb type directional drilling group is arranged; and step (7), performing separation fracture filling on a grouting layer in the overlying strata on the coal mining working face by constructing multiple groups of ground comb type directional drilling holes. By means of the method, ground surface settlement control of mining-filling synchronous operation can be achieved.

The invention provides a safe and efficient combined mining method for a near-surface thick and large low-grade ore body under a broken ore rock condition, and belongs to the field of mining. The first-step stope adopts a downward large-diameter deep hole subsequent filling method, horizontal and vertical anchor cable holes are constructed in a drilling chamber at the top of the stope, and the vertical anchor cable holes are communicated with the ground surface; a subsection medium-length hole subsequent filling mining method is adopted in the stope in the second step, and downward anchor cable holes are constructed in the earth surface above the stope to the boundary of the ore body; after cement mortar is injected into the anchor cable holes, orifice anchor cables are connected in series, prestress is applied, and a combined anchor cable supporting system is formed; filling immediately after the stope is mined in the first step; and after the filling body reaches the preset strength, filling after mining is carried out on the second-step stope. Through application of the combined supporting structure and the mining technology, near-surface thick and large low-grade ore body resources can be safely and efficiently mined, underground occurrence resources are fully utilized, and continuous high-quality development of mine enterprises is guaranteed.

The invention discloses a goaf filling material based on coal slime and a carbon sequestration method. The goaf filling material comprises the following steps: preparing a composite activator and a plurality of pretreated coal slime, steel slag, superfine slag powder and desulfurized gypsum raw materials; the preparation method comprises the following steps: mixing coal slime, steel slag, superfine slag powder, desulfurized gypsum raw materials and a composite activator in proportion, putting into a closed reaction kettle, and carrying out dry mixing and sufficient stirring; adding a proper amount of water into the dry-mixed raw materials according to a solid-to-liquid ratio of 7: 3, and stirring the water and the raw materials through a reaction kettle until the water and the raw materials are fully mixed to form a strong alkali mixture; filling CO2 gas into the reaction kettle, carrying out primary mineralization reaction, and stirring in the reaction kettle to obtain a paste filling material; conveying the paste filling material to a goaf through a pump body, and performing filling operation according to a preset filling process; and after the filled paste filling material is initially set, secondary mineralization reaction is carried out, supercritical CO2 gas is injected into the paste filling material through the pre-buried pipeline, residual alkaline substances in the paste filling material react, and a compact anti-seepage structure is formed.