Study on Pressure Relief Scope of Underlying Coal Rock with Upper Protective Layer Mining

Ben Qing Yuan; Yong Jiang Zhang; Jian Jun Cao; Guo Jian Cheng

doi:10.4028/www.scientific.net/AMR.734-737.661

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 734-737Study on Pressure Relief Scope of Underlying Coal...

Study on Pressure Relief Scope of Underlying Coal Rock with Upper Protective Layer Mining

Abstract:

In this paper,in the case of upper protective layer mining of a mine for the engineering background, based on the model of semi-infinite plane body in elastic mechanics, the theoretical calculation model of verticalhorizontalshear stress of floor coal rock is established, and it is concluded that the stress expression of any point in the impact of distributed force. By introducing the rock strength index I and generalized Hooke's law, it is concluded that the discrimination criterion of guide gas fissure zone and pressure relief desorption belt of underlying coal rock with upper protective layer mining. The pressure relief scope of protection with the mining of upper protective layer is determined. Theoretical analysis shows that: the "pressure relief desorption zone" of the underlying protected coal seam that the vertical distance to the protective layer is 40m lags behind 22.2m.Through field test, the results show that the obtained pressure relief scope of protection is 26.98m,and the theoretical analysis results are basically similar.

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Periodical:

Advanced Materials Research (Volumes 734-737)

Pages:

661-665

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.734-737.661

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Online since:

August 2013

Authors:

Ben Qing Yuan, Yong Jiang Zhang, Jian Jun Cao, Guo Jian Cheng

Keywords:

Desorption Belt of Pressure Relief, Fissure Zone of Guiding Gas, Upper Protective Layer

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