A Strip-like Coal Mining Method for Roof Cutting and Filling Adjacent Goaf

Abstract

The invention provides a kind of strip-like coal mining method for roof cutting and filling near the goaf, which comprises the following steps: the size of the strip mining is smaller than the initial caving step distance L of the direct roof 0 , to keep the roof from collapsing, the small coal pillars are mined first, and the large coal pillars are left. The mining and retention ratio of the small coal pillars to the large coal pillars is 1:2; the small coal pillars are cut , when the remaining small coal pillars are mined by retreating in the upward trough, the top cutting blastholes are arranged along the two boundaries of the small coal pillars from the upward trough, and after the small strip coal pillars are mined, the blasting and top cutting are started from the upward trough; After mining the small strip coal pillars, the large strip coal pillars on one side of the small strip coal pillars are mined nearby, and the broken gangue obtained by cutting off the direct top with the small strip coal pillars is carried out while mining and filling until the mining is completed. The overhanging size of the roof has been kept smaller than the initial collapse distance of the direct roof, the roof will not collapse, and the support is relatively simple and safe; the planar scale of the goaf is reduced by nearly 4 / 5, which can effectively control the surface settlement and have almost no impact on the environment. Not destructive.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a strip-like coal mining method for top cutting and filling adjacent goafs. Background technique [0002] Coal is my country's primary energy source. Experts predict that China's coal output will reach 4.5-5 billion t / a in the next 50 years, and coal will account for no less than 50% of the country's energy. Coal will always be China's primary energy source. However, there are three major problems in my country's coal industry that restrict the development of coal mines: [0003] Safety issues: roof management issues; rock burst; water inrush on the roof and floor of the working face, etc. [0004] Low recovery rate: The population in the eastern and central regions of my country is dense, and the "three downs and ones up" coal pressing mainly in village buildings is very serious. The traditional "three-down-up" coal pressing mainly adopts the strip method of mining, mining one strip...

AI Technical Summary

Problems solved by technology

[0005] Environmental problems: my country's coal mines generally adopt the caving method of mining, which causes rock formation damage and movement, leads to surface mining subsidence, destroys land resources and groundwater resources, and discharges a large amount of gas, coal gangue, and mine water at the same time, polluting the environment

[0006] At present, coal mines mainly adopt solid waste paste filling mining to deal with the problem of coal mining. Solid waste paste filling mining utilizes solid waste such as gangue, and controls the damage of the roof and floor rock layers of the coal mining face, reduces mining subsidence, and protects the ground. However, there are still development bottlenecks in this method: insufficient filling materials, the need for foreign materials, increased investment, and increased the economic burden of coal mines

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