An improved creep model of roadway surrounding rock based on accelerated creep

doi:10.16265/j.cnki.issn1003-3033.2019.05.021

Abstract

Abstract: In order to study the mechanism of fluid-structure interaction in rock creep process, the creep experiment of roadway urrounding rock (sandstone) by MTS815.02 rock mechanics test system was carried out, and the deformation and failure properties of rock during creep were studied.The creep process was described based on the improved creep model of accelerated creep. The least squares method was used to identify creep parameters, and the changes of creep parameters with stress and time were analyzed. Then the self-defined creep equation was embedded into the ANSYS finite element software to simulate the whole process of fluid-structure interaction creep of saturated sandstone samples.The results show that the proposed creep model can describe the whole creep process of rock well, that the good fit between the numerical simulation results and the experimental curves indicates that the model can better describe the accelerated creep properties of rocks, that the correctness and rationality of creep model and creep parameters with time are verified, and that the model provides the basis for reinforcement, disaster prevention and support design of roadway surrounding rock in deep engineering.

Key words: saturated sandstone, fluid-solid coupling, variable parameter, numerical simulation, accelerated creep

CLC Number:

X936

LIU Wenbo, ZHANG Shuguang, LIN Xiaonan, SUN Boyi, LI Ruomu. An improved creep model of roadway surrounding rock based on accelerated creep[J]. China Safety Science Journal, 2019, 29(5): 124-130.

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