Inclined separated layer solid filling coal mining method for super thick coal seam

Abstract

The invention discloses an inclined separated layer solid filling coal mining method for a super thick coal seam, which is suitable for the exploitation of an 'under three' super thick coal seam. The method comprises the following steps: determining the number of inclined separated layers according to the principle that thickness of each separated layer is 2.5-4.5 m; adopting a exploitation sequence that mining layer by layer, and filling at a next row; arranging tunnels and equipment according to the conventional solid filling coal mining method; carrying out a circulating sequence that coal mining firstly, metal nets and bamboo fences paving secondly, and filling finally to complete the filling exploitation of a first mining surface and a first separated layer; meanwhile, mining according to the same filling coal mining method under the shield of a manual false roof formed by the first separated layer at the corresponding position of a second separated layer 4 months after a working face of the first separated layer finishes mining; circulating in the way that the exploitation of one separated layer is performed under the shield of a manual false roof manufactured by an upper separated layer continuously until the whole super thick coal seam is mined out. Through the adoption of the method, resources of the 'under three' super thick coal seam can be utilized, the rock formation movement and earth surface sinking can be effectively controlled; and the recovery ratio is high, the production efficiency is high, the cost is low, and the method has wide practicability in the field of thick coal seam filling exploitation.

Description

technical field [0001] The invention relates to an oblique layered solid filling coal mining method in an extra-thick coal seam, which is especially suitable for mining of "three-down" extra-thick coal seams. Background technique [0002] "Three lower" extra-thick coal seams (8-20m) resources are widely distributed in my country, and are important coal seams for high-yield and efficient mining in my country's coal mines. At present, there are two main types of mining methods for "three lower" extra-thick coal seams (8-20m) in China. The first type is: layered mining, top-coal caving mining, and thickness-limited mining. These methods adopt the natural caving method Roof management has the following problems: the natural collapse of the roof causes surface subsidence, damages surface buildings, railways, etc., and also causes groundwater level subsidence to damage the ecological environment; the second category includes: strip mining, large-scale coordinated mining, and grout...

AI Technical Summary

Problems solved by technology

At present, there are two main types of mining methods for "three lower" extra-thick coal seams (8-20m) in China. The first type is: layered mining, top-coal caving mining, and thickness-limited mining. These methods adopt the natural caving method Roof management has the following problems: the natural collapse of the roof causes surface subsidence, damages surface buildings, railways, etc., and also causes groundwater level subsidence to damage the ecological environment; the second category includes: strip mining, large-scale coordinated mining, and grouting Subsidence reduction mining, etc. Although this type of mining method plays a certain role in controlling surface subsidence and can ensure the safe use of ground buildings and railways, its degree of mechanization is relatively low, recovery rate is low, production cost is high, and production efficiency is low. Poor, small scale or partially research stage

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