Numerical simulation of movement of both rock mass and surface under thick loose layer high-intensity mining condition

doi:10.16265/j.cnki.issn1003-3033.2018.01.022

Abstract

Abstract: To study the movement of both rock mass and surface caused by high-intensity mining under thick loose layer, 3D numerical simulations were carried out for a certain working face in Huobaoganhe Coal Mine taken as a sample. Distribution of overburden failure plastic zone and that of as a function of the vertical stress advance distance were obtained. Characteristics of overburden failure and surface subsidence were analyzed comprehensively. The effectiveness of the numerical simulations was verified by means of the probability integral method and the field measured values. The research results show that the predicted surface subsidence values of the above three methods are close together, and thus the numerical simulation results are credible, that the process of overburden failure is divided into four stages: an initial stage, a slowly increasing stage, a suddenly increasing stage and an ending stage, and that the failure boundary of overlying strata is like a Chinese character corresponding to the word of eight, while that of the moving boundary of thick loose layer looks like an inverted Chinese character corresponding to the word of eight, and a "hourglass" shape is formed by the two boundaries.

Key words: thick loose layer, high-intensity mining, overburden failure, surface subsidence, rock mass and surface moving boundary

CLC Number:

X936

ZHAO Gaobo, GUO Wenbing, LOU Gaozhong, MA Zhibao. Numerical simulation of movement of both rock mass and surface under thick loose layer high-intensity mining condition[J]. China Safety Science Journal, 2018, 28(1): 130-136.

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