Mechanism of Surface Subsidence Propagation Based on Structural Instability Characteristics of Combined Rock Strata

doi:10.12068/j.issn.1005-3026.2022.04.014

Abstract

Abstract: By dividing the overlying strata of the stope into a number of combined rock strate， and analyzing the mechanism of surface subsidence expansion through the instability characteristics of the combined rock strate， the internal relationships between failure sequences of the beam and support of the combined rock strate， as well as the expansion of the surface subsidence were analyzed respectively. It is believed that the failure of the rear support of the combined rock strate and the subsequent slipping into the goaf is the fundamental reason for the expansion of the surface subsidence. A quantitative method for describing the collapse of the combined rock strate till to the surface subsidence process was proposed. Based on the plastic softening and damage theory of the coal and rock mass， the calculation formula for the failure width of the support body at the rear of the structure is deduced. According to the subsidence expansion mechanism and quantitative formula， the engineering example calculation of SW4102 and SW4103 working faces of Tiefa Xiaonan Mine is carried out.

Key words: combined rock strata; structural instability; surface subsidence; failure of support body; collapse

CLC Number:

TP20

YU Jian-yang， JING Hong-di， LIU Xiao-bo ， SHAN Chuan. Mechanism of Surface Subsidence Propagation Based on Structural Instability Characteristics of Combined Rock Strata[J]. Journal of Northeastern University(Natural Science), 2022, 43(4): 559-566.

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