A Comparative Study on the Stress Distribution in Mine Backfill Through Theoretical and Numerical Analysis

doi:10.12068/j.issn.1005-3026.2019.12.019

Abstract

Abstract: Rotation of principal stress direction can occur due to the shear friction between the surrounding rock and the backfill， as well as the unequal wall inclinations of the backfilled stope. According to soil mechanics， the lateral pressure coefficient was introduced to consider the variation of the direction of the principal stress. Based on the force balance of the horizontal differential element， the analytical solution of vertical stress in backfill was derived. The results show that the introduced lateral pressure coefficient is a function of the backfilled stope height. For a constant footwall inclination angle， the larger the hang wall inclination angle is， the smaller the direction of the principal stress deflects due to the frictional forces in the interface between the surrounding rock and the backfill. Compared with the cohesion in the backfill， the friction angle at the interface between the backfill and the surrounding rock has a obvious influence on the arching effect of the backfill.

Key words: backfill, lateral pressure coefficient, theoretical analysis, numerical simulation, arching effect

CLC Number:

TD853. 34

YAN Bao-xu， ZHU Wan-cheng， HOU Chen， JIA Han-wen. A Comparative Study on the Stress Distribution in Mine Backfill Through Theoretical and Numerical Analysis[J]. Journal of Northeastern University Natural Science, 2019, 40(12): 1773-1778.

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