A mixed filling method of gangue and high-water materials

Abstract

The invention discloses a method for mixing and filling gangue and high-water materials, which utilizes the high-water materials to supplement the filling gaps of the gangue, thereby achieving compactfilling and bearing a top plate of a goaf. The method comprises the following steps: step 1), a filling retaining wall is arranged on one side of a working face transportation roadway in a way of filling the high-water materials in bags after a filling connection roadway is dug and mined based on a long wall production system; step 2), high-water material filling pipelines is arranged on two sides of the filling connection roadway and the top plate; step 3), the gangue is thrown to the goaf; step 4), a high-water filling material retaining wall is arranged on one side of a working face returnairway after the gangue is thrown, an overflow hole is reserved, and the high-water filling materials are injected into the goaf for filling through reserved filling pipelines; step 5), the reservedoverflow hole is detected. Slurry overflow indicates that the filling is completed and stopped; step 6), the next mining and filling cycle is carried out at an interval of three filling connection roadways and coal pillars. The method effectively reduces the ground surface subsidence value of the mining area of the working face, and simultaneously greatly improves the roof connection rate and thecompactness of the filling body of the goaf.

Description

technical field [0001] The invention relates to a mixed filling method of gangue and high-water materials, belonging to the technical field of coal mine goaf filling. Background technique [0002] Coal has played an important role in China's primary energy structure for a long time. With the increasing demand for coal resources, coal mines have to mine coal against the "three undercuts". Controlling the surface subsidence caused by mining and reducing the amount of disturbance caused by coal mining to village buildings near the mining area are problems that need to be solved urgently in the current coal mine production. At the same time, most mines use the shield tunneling method to improve the efficiency of coal mine tunneling, but the muddy waste rock produced during the shield tunneling process cannot be lifted to the ground by a winch, and a large amount of waste rock gathers underground, seriously restricting the use of underground space and threatening mine transportat...

AI Technical Summary

Problems solved by technology

Although the above method solves the problem of underground gangue disposal, due to the small amount of gangue generated by excavation and the difficulty of connecting the roof after filling the goaf, it is impossible to effectively control the movement of the overlying rock in the goaf and the subsidence of the surface, which still has a great impact on the surface buildings.

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