Stability analysis of surrounding rock considering influence of intermediate principal stress

被引：0
作者：
Kong, Chao [1 ,2 ]
Qiu, Wenge [1 ,2 ]
Zhang, Huijian [1 ,2 ]
Liu, Kai [1 ,2 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan
[2] MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2015年 / 36卷 / 04期
关键词：
Constitutive model; Deep buried tunnel; Intermediate principal stress; Strength criterion; Surrounding rock stability;
D O I：
10.3969/j.issn.1001-4632.2015.04.11
中图分类号：
学科分类号：
摘要：
Based on the analysis of the influence of intermediate principal stress on the strength of surrounding rock, with the finite difference software FLAC3D, the constitutive model for the strength criteria of rock mass was constructed considering the influence of intermediate principal stress, which was compared with Mohr-Coulomb criteria, and the influence of intermediate principal stress on the stability of tunnel surrounding rock was studied. The results showed that, the calculated strength of rock mass after considering intermediate principal stress increased obviously by the comparison with the condition without considering intermediate principal stress. The strength of rock mass increased by 75%~200% when the intermediate principal stress was greater than or equal to the compressive strength of rock mass. If the results of surrounding rock obeyed the Mohr-Coulomb failure criterion, in a certain number range, the intermediate principal stress had no influence on the stress distribution of tunnel surrounding rock and almost no influence on crown settlement and plastic zone as well. If the results of the surrounding rock obeyed the strength criteria of rock mass considering intermediate principal stress, the strength of surrounding rock increased gradually with the gradual increase of intermediate principal stress, but the crown settlement, disturbance range due to excavation and the radius of plastic zone all decreased gradually. Thus, when the lateral stress of tunnel is larger, to perform numerical simulation using the strength criteria of rock mass considering intermediate principal stress can reflect more accurately the stability of surrounding rock. © 2015, Chinese Academy of Railway Sciences. All right reserved.
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页码：67 / 73
页数：6
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