Study on control of mining influence by hydraulic fracturing in key strata

doi:10.16265/j.cnki.issn1003-3033.2019.11.027

Abstract

Abstract: In order to reduce impact and damage of coal mining on surface structures, with 5304 working face of Sihe Coal Mine, Jincheng Coal Mining as a research object, theoretical analysis and numerical simulation were conducted to analyze control of working face's mining influence by hydraulic fracturing in key strata. Then collapse mode of overburden and surface subsidence laws of key strata before and after hydraulic fracturing were studied, and its control mechanism on surface subsidence was revealed. The results show that after hydraulic fracturing, the movement mode is transformed from bending subsidence to sliding shear drop along fracturing zone. As surface subsidence curve in the hydraulic fracturing zone becomes steep, subsidence value will increase while influence scope of surface mining on fracturing side decreases.

Key words: key strata movement mode, surface subsidence control, mining influence, hydraulic fracturing, numerical simulation

CLC Number:

X936

FENG Zhanjie, GUO Wenbing. Study on control of mining influence by hydraulic fracturing in key strata[J]. China Safety Science Journal, 2019, 29(11): 171-176.

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