Numerical Optimization Analyses of Dangerous Rock Mass Sliding Failure Under Freeze-thaw Cycles

被引：0
|
作者：
Shu J. [1 ]
Deng Z. [1 ]
Huang J. [1 ]
Wu B. [2 ]
Zhang X. [1 ]
机构：
[1] Jiangxi Province Key Lab. of Environmental Geotechnical Eng. and Hazards Control, Jiangxi Univ. of Sci. and Technol., Ganzhou
[2] State Key Lab. for Performance Monitoring and Guarantee of Rail Transportation Infrastructure, East China Jiaotong Univ., Nanchang
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2023年 / 55卷 / 02期
关键词：
freeze-thaw cycles; freezing depth; frost heave force; limit equilibrium; mesoscopic deterioration; rock debris loss;
D O I：
10.15961/j.jsuese.202200696
中图分类号：
学科分类号：
摘要：
The action of freeze-thaw (F–T) cycles is the main inducement for the collapse and instability of dangerous rock mass in cold regions, and it is particularly important to carry out numerical optimization analysis on the disaster pregnant factors of sliding failure of dangerous rock mass in cold regions. Firstly, based on the limit equilibrium theory, the stability analysis model of sliding dangerous rock mass under the action of F–T cycles was established by considering the frost heave force of through section structural plane, the deterioration of the cohesive force of the locked section, and the evolution of the freezing depth. Secondly, based on the theory of rock frost heave and considering the water migration during the freezing process, the calculation method of the frost heave force of the through structural plane section was derived. Thirdly, the mesoscopic defects of rock were simplified to numerous circular pores. According to the expansion theory of circular pores and the Mohr–Coulomb yield criterion, the process of pore frost heave failure was analyzed, and the meso degradation model of rock cohesion in the non-penetrated section under the action of the freeze-thaw cycle was constructed. Finally, the calculation method of the evolution of the rock freezing depth of the locked section with the number of F–T cycles was obtained by improving Stephan’s empirical formula. Combined with the engineering calcula- tion example to analyze the influence of each sensitive parameter on the stability of the dangerous rock body, it was found that the stability of sliding dangerous rock mass showed a fast and then slowly declined with the increase of the number of F–T cycles. The stability coefficient of sliding dangerous rock mass was positively correlated with the freezing temperature. At the same freezing temperature, the stability coefficient decreased with the increase of the number of F–T cycles with a significant marginal decreasing effect. The stability of dangerous rock mass was negatively correlated with the rock debris loss ratio, and the rock debris loss ratio changed both the trend of stability deterioration and the degree of deterioration. Controlling the rock debris loss ratio was conducive to the long-term stability of the dangerous rock mass in cold regions. © 2023 Editorial Department of Journal of Sichuan University. All rights reserved.
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页码：59 / 69
页数：10
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