煤炭地下气化多层热弹性基础梁模型及其应用

doi:10.13722/j.cnki.jrme.2015.0686

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Abstract In order to obtain the movement and subsidence of overlying strata under stripe mining with underground coal gasification(UCG)，a multi-layer elastic foundation beam model with temperature field for Huating coal mine was established. The direct and indirect influence of the temperature field on rock beam deflection was theoretically analyzed based on Fourier analysis of overlying strata during gasification process. The analytical solution of rock beam deflection with the damaged elastic foundation was obtained by introducing the coal burnt damage factor and determining the damaged ranges. The deflection，bending moment，shear force and transient loading of rock beam were theoretically analyzed. The temperature field was found to form the additional bending moment and thermal stress in rock beam in vertical direction and horizontal direction respectively，which increased first and then decreased with time in the immediate roof while increased continuously in the main roof during the gasification process. The deflection，bending moment，shear force and load of the rock beam were larger than that at normal temperature，and the values increased first and then decreased with time. The model was proved to be reasonable by comparing with the field measured subsidence curve.

Key words： mining engineering underground coal gasification(UCG) thermo-elastic foundation beam deflection rock movement

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	Articles by authors
	XIN Lin1
	2
	CHENG Weimin1
	2
	WANG Gang1
	2
	NIE Wen1
	2
	ZHOU Gang1
	2
	LIU Zhen1
	2
	YU Yanbin1
	2

Cite this article:

XIN Lin1,2,CHENG Weimin1, et al. Multi-layer thermo-elastic foundation beam model of UCG and its application[J]. , 2016, 35(6): 1233-1244.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0686 OR http://www.rockmech.org/EN/Y2016/V35/I6/1233

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