Method for mining pressed coal below shallow buried gas delivery pipelines

Abstract

The invention discloses a method for mining pressed coal below shallow buried gas delivery pipelines. The method includes steps of (1), establishing earth surface subsidence curve equations W and predicting subsidence conditions of earth surfaces along the directions of the pipelines after resources are mined; (2), computing bending moment of the shallow buried gas delivery pipelines and the maximum bending stress of the pipelines; (3), determining required-to-be-protected ranges of the shallow buried gas delivery pipelines; (4), erecting suspension bridges along the directions of the pipelines according to the protected ranges determined at the step 3 and lifting the pipelines in subsidence areas; (5), mining the coal resources below the pipelines in conventional modes, detaching the suspension bridges after the earth surfaces are subsided and then are stable, and repeatedly carrying out the steps before a next working face is mined until all the resources in a mining area are completely mined. The method has the advantages that the shallow buried gas delivery pipelines can be protected by a process for suspending the pipelines by the aid of the suspension bridges according to dynamic deformation influence on the shallow buried gas delivery pipelines when the coal resources are mined, and accordingly the pressed coal resources below the pipelines can be mined in the normal mining modes.

Description

Technical field [0001] The invention relates to a mining method for compressed coal, in particular to a mining method for compressed coal under a shallow buried gas pipeline, and belongs to the field of coal mining. Background technique [0002] Surface subsidence induced by coal mining will cause great damage to the surface environment and structures. my country's long-distance gas pipelines pass through major coalfields in my country. With the continuous expansion of coal mining areas, more and more gas pipelines will be affected by mining subsidence. The high-pressure gas in the pipeline is flammable and explosive. Once the gas leaks or the pipeline breaks, it is easy to cause major accidents, causing heavy casualties and property losses, and causing serious harm to social production and the national economy. [0003] Most of the existing gas pipelines are shallow-buried gas pipelines, and their protection methods mainly adopt the protection of coal pillars. In the coal mining...

AI Technical Summary

Problems solved by technology

[0004] (1) The layout of the shallow buried gas pipeline relative to the coal mining face is random, and the coal pillars for pipeline protection in coal mining will have a great impact on the layout of the coal mining face and the way of coal mine development in the mining area

[0005] (2) Generally, the protective coal pillars along the shallow buried gas pipeline are relatively wide, and the width of the protective coal pillars is generally about 1000m, which will cause a lot of waste of coal resources

[0006] (3) The stagnation of coal resources along the shallow buried gas pipeline will have a huge impact on the production and economic benefits of the mining area, affecting the sustainable development of the mining area

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