承压水上开采沿工作面倾向底板力学破坏特征

doi:10.13722/j.cnki.jrme.2018.0058

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Abstract In order to study the stress distribution and mechanical failure characteristics of mining floor along the inclination of the working face above confined water，mechanical models of floor rock were constructed considering the combined action of supporting pressure and confined water along the inclination of the working face respectively. The stress distribution and failure form of floor were theoretically calculated considering the characteristics of initial and periodic pressure. The mechanical failure characteristics and stress distribution of mining floor based on numerical simulation of FLAC3D and in-situ testing technology were further discussed. The failure tendency of mining floor along the inclination of the working face has an“inverted saddle shape”. The corresponding shear stress is distributed in“reverse symmetry spiral”，which approximates a pair of positive and negative shear couple and is easy to produce shear failure along the boundary. This is in accordance with the failure zone and the stress distribution from numerical simulation. The maximal value of concentration level is located at the boundary of the elastic and plastic junction. The ratio of the supporting pressure coefficient under the initial and periodic pressure is approximately equal to that of the maximum vertical stress concentration coefficients. The simulation shows that the pore water is progressively promoted along the floor and easy to pour into the working face from the underneath part of its two ends，forming a water inrush phenomenon，which is in accordance with the actual water inrush position. The maximum failure depths from theoretical calculation，numerical simulation and field measurement are 12，12.875 and 13.75 m respectively，and the three results are quite close to each other. The results obtained from the mechanical model are in good agreement with one from the numerical simulation，and are consistent with the actual failure mode.

Key words： mining engineering mining above confined water floor rock mass the inclination of the working face stress distribution failure characteristics

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	SONG Wencheng1
	LIANG Zhengzhao1
	ZHAO Chunbo2

Cite this article:

SONG Wencheng1,LIANG Zhengzhao1,ZHAO Chunbo2. Mechanical failure characteristics of mining floor along working face inclination above confined water[J]. , 2018, 37(9): 2131-2143.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0058 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I9/2131

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