沿空留巷关键块大跨距下充填体参数的确定

doi:10.11799/ce201811010

Abstract

Abstract: There are many problems of coal mining in China, such as large waste of resources, low utilization rate and so on. Gob-side entry retaining technology has advantages in non-chain pillar entry protection and green safe mining. It is an important improvement of gob-side entry retaining technology to study the large-span fracture characteristics of critical block and select reasonable strength and width of filling wall. Taking Xingwu coal mine in Shanxi Province as an example, the long-span fracture mechanism of key blocks in medium-thick seam is analyzed, and the static load formula of filling wall is derived theoretically. UDEC2D software is used to simulate and analyze the deformation law of filling wall with different width and strength. Based on the criteria of lateral displacement, axial displacement, axial stress and economic benefit, the different schemes are compared and analyzed. The results show that the surrounding rock of roadway can be controlled stability when the filling wall strength is 12 MPa and the width is 1.2 m.

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URL: http://www.coale.com.cn/EN/10.11799/ce201811010

http://www.coale.com.cn/EN/Y2018/V50/I11/38

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Determination of the Parameters of Filling Wall Based on Large Span of Critical Rock Block in the Gob Side Entry Retaining

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