Cover rock crack and surface subsidence controlled digging, mining and filling parallel operation coal mining method

Abstract

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.

Description

technical field [0001] The invention relates to a coal mining method, which belongs to the technical field of coal mining, in particular to a coal mining method for controlling overburden rock fissures and surface subsidence in parallel operation of excavation, mining and filling. Background technique [0002] Water conservation mining is to choose reasonable coal mining methods and techniques so that the impact of mining will not cause damage to the water structure of the aquifer; or although it is damaged to a certain extent, causing part of the water loss, the water level of the aquifer can still be maintained within a certain period of time. Restoration; or even if the groundwater level cannot be restored to its original state, it will not affect its normal water supply, at least it can guarantee the surface ecology's demand for water resources. [0003] The existing water-retaining mining technology has a low recovery rate, or the water-retaining effect is not good, and...

AI Technical Summary

Problems solved by technology

Compared with other surface subsidence control methods, filling mining is currently the most effective method to control surface subsidence. The goaf can be partially filled or completely filled. According to the layout characteristics of the working face, the main method includes goaf filling in the longwall working face. , strip filling, roadway filling, etc. The main problems of these methods are that it is difficult to coordinate operations between coal mining and filling, the filling system is complicated, the filling space is large, and the filling time is long.

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