浅埋煤层地表厚砂土层“拱梁”结构模型研究

Abstract

Abstract:

The largest shallow coal field in the world is in west China. The coal seams have thin roof and thick sandy overburden. The failure of thick sandy soil layer spreads to the ground surface in shallow seam mining, which will cause heavy disasters, such as dynamic ground pressure in coal faces and ground surface subsidence. Through physical simulation model tests, the development of fractures in sandy soil layer and on the ground surface is observed to be temporary structure of “arch beam” and periodic “arch rock pillar”structure. The “arch beam” mathematical model is set up; and the stress distribution in the “arch beam” is presented. Furthermore, the criterion of thick sandy soil layer failure is set up; and the position of periodic tension fracture is determined. This work provides basis for analyzing roof pressure control and surface subsidence.

Key words: shallow seam, thick sandy soil layer, arch beam, mathematical model

CLC Number:

TD 31

HUANG Qing-xiang, ZHANG Pei, DONG Ai-ju. Mathematical model of “arch beam” of thick sandy soil layer movement in shallow seam[J]., 2009, 30(9): 2722-2726.

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Mathematical model of “arch beam” of thick sandy soil layer movement in shallow seam

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