深部采场覆岩应力路径效应与失稳过程分析

doi:10.13722/j.cnki.jrme.2019.0622

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Abstract In order to reveal the three-direction mining stress variation law and the relationship between the mining stress variation and the overlying strata instability，a method for calculating the disturbance coefficient of three-direction mining stresses was proposed，and the temporal and spatial evolution characteristics of mining stresses and the process of fracture instability of overlying strata in deep stopes were studied. The transformation forms of the principal stress under different loading and unloading conditions were analyzed based on the Mohr-Coulomb strength criterion. The ratio of the maximum and minimum principal stress difference to the distance from the center of the molar stress circle to the intensity curve was proposed as the criterion for determining the intensity disturbance of three-direction mining stresses，and the disturbance coefficient of three-directions mining stresses was deduced. Based on the elastic-plastic mechanics theory，the change rules of the magnitude and direction of the three-direction mining stresses in the overlying strata along the working face advance and the working face length directions in the deep stope were analyzed using 3DEC simulation. The mining stress disturbance coefficient and disturbance intensity partition of the overlying strata in front of the working face were obtained，and the spatial-temporal evolution characteristics of mining stresses in overlying strata were revealed in deep stopes. Based on the relationship of the mining stress and the displacement of overlying strata in the process of breaking，the breaking process of roof strata were subdivided to five stages of mining stress increase，bedding separation，fracture instability，fracture instability of upper roof strata and compaction stability of overlying strata. The variation rule and action mechanism of mining vertical and horizontal stresses in the process of overlying strata breaking were revealed. The research results were applied in the mining practice with 1 000 m buried depth of coal seam，and the phenomena of frequent occurrence of mine pressure and low compressive strength were better explained.

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mining engineering deep mining mining stresses disturbance intensity stress rotation ')" href="#">fracture process

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	PANG Yihui1
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	WANG Guofa1
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	LI Bingbing3

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PANG Yihui1,2,WANG Guofa1, et al. Stress path effect and instability process analysis of overlying#br# strata in deep stopes#br#[J]. , 2020, 39(4): 682-694.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0622 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I4/682

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