Calculating model of critical temperature for frost heave failure of tunnel surrounding rock in cold regions

doi:10.16265/j.cnki.issn 1003-3033.2021.12.015

Abstract

Abstract: In order to establish failure criterion for frost heaving of surrounding rock with defects at different scales, based on elasticity and fracture mechanics as well as frost heaving force value, the criteria for macro and micro defects were obtained, and a calculating model of critical temperature of tunnel surrounding rock with macro and micro defects in cold regions was established. Then, with Dabanshan tunnel as an example, influence of different parameters on critical temperature for frost heave failure of micropores and macro joints was analyzed. The results show that this temperature for micropore failure increases significantly with that of main hole axis diameter. However, increase in equivalent diameter of secondary pore axis has a smaller effect on the temperature, and its main function is to form a main-branch type pore structure with major pores. In terms of macro joints, its critical temperature increases with that of joint length and tunnel section radius. Moreover, it first decreases and then increases with the growth of joint inclination angle, with its peak critical value appearing at the angle of 40°.

Key words: tunnel in cold regions, surrounding rock, frost heave damage, critical temperature, macro and micro defects, micropores

CLC Number:

X935

SHU Jiajun, DENG Zhengding, HUANG Jingzhu, WU Bingni. Calculating model of critical temperature for frost heave failure of tunnel surrounding rock in cold regions[J]. China Safety Science Journal, 2021, 31(12): 113-120.

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