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

Abstract

An inclined layered solid-filling mining method in an ultrathick coal layer is applicable to exploitation in a "three-unders" ultrathick coal layer. In this method, the number of inclined layers is determined based on a principle of layered thickness from 2.5 m to 4.5 m, and a layered-exploitation downward-filling exploitation order is adopted. Tunnels and equipment are arranged according to a conventional solid-filling mining method. A cyclic order of mining, layout of metal meshes (14) and bamboo fences (24), and filling is adopted, so as to accomplish filling and exploitation of a first mining face and a first layer (21). Meanwhile, 4 months after the working face of this layer is finished, at a corresponding position in a second layer (22), under the cover of an artificial ceiling formed by the first layer (21), exploitation is performed by using the same filling mining method; such a cycle is repeated, and exploitation in a current layer is performed under the cover of an artificial ceiling fabricated by an upper layer, until the entire ultrathick coal layer is finished. When this method is adopted to exploit "three-unders" ultrathick coal layer resources, strata movement and earth surface subsidence may be effectively controlled; the method has a high extraction rate, high production efficiency, and low cost.

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

Images