36results about How to "Subsidence control" patented technology

The invention discloses a cover rock crack and surface subsidence controlled digging, mining and filling parallel operation coal mining method. Stope transportation roadways, stope branch roadways and double wing stoping rooms are arranged in a stope, wherein the stope transportation roadways and the stope branch roadways are branch roadways, and coal mining is carried out in the double wing stoping rooms. All the double wing mining rooms are sequentially exploited and are sequentially timely filled, two sides of each of the double wing mining rooms are supported by unexploited coal or the filled double wing mining rooms to control a top board, and the length of each of the double wing mining rooms and the number of one-stage filling double wing mining rooms are controlled to realize the zero (less) support of the double wing mining rooms in order to finally realize non-pillar mining. The method reduces the support engineering amount of the double wing mining rooms, reduces the number of filled airtight walls, realizes digging, mining and filling parallel operation, effectively controls the mining cover rock crack and surface subsidence and realizes water resource protection mining (water conservation mining) and safe and efficient stoping of 'three unders' coal resources.

The invention discloses a method for conducting goaf partial filling according to ground surface subsidence characteristics. The method comprises the steps that the positions of filling bodies are designed according to a ground surface subsidence contour map; complete filling is conducted within a central area range, and a subsidence center is controlled; multiple circles of filling strips are arranged outside the complete filling range, and a larger subsidence region is controlled; multiple rows of filling monomers are arranged outside the filling strips, and a subsidence edge region is controlled; the filling bodies with different shapes are arranged in a goaf in a targeted mode, deformation destruction and ground surface subsidence of a roof are controlled, a filling body-roof structure control system is formed, and deformation destruction and ground surface subsidence of an upper overlying strata are controlled; narrow filling strip goaf-side retained roadways are arranged, the roadway driving workload of the next working face is reduced, and the goaf is filled in a sealed mode. According to the method for conducting goaf partial filling according to the ground surface subsidence characteristics, deformation destruction and ground surface subsidence of the roof can be effectively controlled, the recovery rate of coal mining under buildings, railways and water bodies is increased, and the environment is protected; filling materials are saved, the filling cost is reduced, and a large amount of underground space formed through filling is reused.

A continuous miner drilling type paste filling mining method for side-side coal, belonging to the field of coal mining methods, can solve the problems of existing side-side coal mining, personnel entering the tunnel to lay filling pipelines, filling rate and roof connection effect Poor environmental protection, low resource recovery rate, damage to the ecological environment of the mining area, poor slope stability, etc., the open-pit coal mine is divided into several sections, and several mining tunnels are planned in the section, and the mining tunnels are reserved between the mining tunnels. In the section, the initial mining jumping is carried out. At the same time, a number of filling holes are arranged on the surface above the middle of the mining tunnel, and steel casing walls are used to inject high-concentration filling bodies into the mining tunnel. After mining, a mining tunnel is formed. In the empty area, the filling operation is completed in two stages. After the primary mining is completed in the section, the secondary mining is carried out until the mining and filling of all section mining tunnels are completed. The method can improve the safety during mining and filling, and does not require personnel to enter the roadway for operation; the filling process is simplified and the filling cost is reduced.

The invention provides an interval skip-mining type filling coal mining method and belongs to the technical field of coal mine filling coal mining methods. The interval skip-mining type filling coal mining method comprises the steps that a first open-off cut is dug at the tail end of a butt entry, a second open-off cut is dug a certain distance away from the first open-off cut, and mining is conducted at the position of the second open-off cut with the wall type system coal mining method after the second open-off cut is well dug; a third open-off cut is dug a certain distance away from the second open-off cut, a gob formed after mining is conducted at the position of the second open-off cut is filled while the third open-off cut is dug, and the rest operation is conducted by analogy till mining is conducted on a mining stopping line. By the adoption of the interval skip-mining type filling coal mining method, mining can be conducted under the condition that the two ends are supported, sequential mining and sequential filling are achieved, the integrity of a base plate of a roof is guaranteed, movement of overlying rock is reduced, and the purpose of surface subsidence control is achieved; after mining with filling is completed, coal pillars left after mining do not need to be filled, filling materials are reduced, and filling cost is reduced.

The invention provides a pocket type separated strata grouting material for controlling surface subsidence. The pocket type separated strata grouting material is composed of a main material and water in the following ratio, the main material consists of cement, fly ash and an admixture, wherein the water-ash ratio is 0.7-0.8, the ratio of fly ash to cement is 0.8-0.9, and the admixture accounts for 3%-5% of the total amount of the main material. The pocket type separated strata grouting material provided by the invention has the characteristics of good pumpability, low bleeding rate and layering degree, short setting time, high strength and stability, small grout dosage, single-hole grouting total amount of about 13m<3>, and low cost. The invention also provides a preparation method and grouting method of the pocket type separated strata grouting material. The preparation method has the advantages of simple operation and low cost. The grouting method can flexibly control the separated strata grouting time, fundamentally limits the development of separated strata, ensures that key strata do not break, and reaches the purpose of controlling surface subsidence. Through the isolation function of the pocket, slurry does not leak to cause environmental pollution.

A device and method for testing the compression performance of filling bulk under dynamic-static force, including a hydraulic cylinder, a steel structure frame, a hydraulic cylinder installed on the upper surface of the bottom end of the steel structure frame, and a lifting platform, a circular cylinder, etc. Barrel device, first load sensor, loading plunger, and second load sensor. The top of the steel structure frame is provided with movable loading I-shaped blocks and brackets, impact iron blocks and electromagnets in turn. The electromagnets are connected with steel ropes. The device is connected with the computer through wires and multi-channel static strain gauges, and the second load sensor and the first load sensor are respectively connected with the multi-channel static strain gauges through wires. The invention can not only obtain the compression amount and modulus characteristics of the waste rock bulk under static action, but also measure the lateral pressure of the bulk when the bulk is compressed. The strength of surrounding rock, maintaining the stability of the void and the distribution of lateral pressure in the filling bulk have an important guiding role in the design of filling mining.

A method of local filling to control surface subsidence in a gob. Metal nets are suspended at intervals from open-off cuts and on top plates behind a hydraulic bracket on a working surface along with coal cutting of a coal cutter and movement of the hydraulic bracket on the working surface, and filling bags are arranged; coal cutting is stopped after cutting is performed once by the coal cutter, and concrete is filled into the filling bags in the metal nets in sequence until a roof; cutting is continuously performed once by the coal cutter, metal nets are continuously suspended on top plates adjacent to the two sides of the filled area, filling is continuously performed to complete a filling cycle, and a row of filled bodies are formed in a gob parallel to the working surface; and coal cutting is continuously performed four to five times by the coal cutter, the following filling cycle is completed continuously, and the procedures are repeated until filling of the whole gob is completed and a plurality of rows of filled bodies are formed in the gob. The method is simple, and the filling cost is low. The top plates in the gob are supported uniformly at intervals; therefore, the stability of an overburden layer, in particular a key layer, can be improved, and surface subsidence and damage to buildings can be effectively prevented.

The invention belongs to the technical field of coal separation, in particular to a mobile gangue photoelectric separation robot; including a vibration feeding module, a conveying module, a dual-energy X-ray recognition decision-making module and a coal-gangue separation module; a dual-energy X-ray The source is fixedly installed in the installation box, and the dual-energy X-ray source is located directly above the conveyor belt; the X-ray flat panel detector is installed directly below the empty belt of the conveyor module, and the X-ray flat panel detector corresponds to the dual-energy X-ray source ; The measurement and control instrument is connected with the dual-energy X-ray source electrical signal; the power supply device is used to supply power to the measurement and control instrument, the dual-energy X-ray source and the X-ray flat panel detector; Intelligent and efficient separation of coal gangue based on dual-energy X-ray transmission coal preparation The equipment can realize real-time intelligent separation of coal and gangue underground. Compared with underground jigs and dense medium cyclones, etc., it optimizes the coal preparation process, improves the separation rate of coal and gangue, and reduces the cost of the chamber area. Occupy, improve the quality of coal.

The invention discloses a deep-well frozen filling body cooling design method. From the design angle of mine cooling, when the cooling control value is reached, under the conditions of different sizegrading and filling materials, the refrigeration capacity and time and the cooling efficiency of a frozen filling body are tested; from the design angle of the filling rate, when the engineering control value is reached, under the freeze thawing conditions of the different size grading and filling materials, the compacting mechanical properties are tested; the optimum material ratio, the size grading and the temperature which reach cooling and achieve engineering control are determined; and by mounting top plate dynamic monitoring equipment and temperature sensing equipment, the temperature, the material ratio and the size grading of the frozen filling body are adjusted in real time, and thus the filling and cooling effects are guaranteed. Through the deep-well frozen filling body coolingdesign method, the difficult problem of cooling of the deep solid filling mining technology on an engineering site is solved.