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Geomechanics and Engineering Volume 20, Number 1, January10 2020 , pages 43-54 DOI: https://doi.org/10.12989/gae.2020.20.1.043 |
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Reliability analysis of anti-seismic stability of 3D pressurized tunnel faces by response surfaces method |
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Biao Zhang, Zongyu Ma, Xuan Wang, Jiasheng Zhang and Wenqing Peng
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| Abstract | ||
| The limit analysis and response surfaces method were combined to investigate the reliability of pressurized tunnel faces subjected to seismic force. The quasi-static method was utilized to introduce seismic force into the tunnel face. A 3D horn failure mechanism of pressurized tunnel faces subjected to seismic force was constructed. The collapse pressure of pressurized tunnel faces was solved by the kinematical approach. The limit state equation of pressurized tunnel faces was obtained according to the collapse pressure and support pressure. And then a reliability model of pressurized tunnel faces was established. The feasibility and superiority of the response surfaces method was verified by comparing with the Monte Carlo method. The influence of the mean of soil parameters and support pressure, variation coefficients, distribution type and correlation of c-phi on the reliability of pressurized tunnel faces was discussed. The reasonable safety factor and support pressure required by pressurized tunnel faces to satisfy 3 safety levels were presented. In addition, the effects of horizontal seismic force, vertical seismic force and correlation of kh-kv on the reliability of pressurized tunnel faces were also performed. The method of this work can give a new idea for anti-seismic design of pressurized tunnel faces. | ||
| Key Words | ||
| 3D failure mechanism; pseudo-static method; response surfaces method; reliability; correlation | ||
| Address | ||
| Biao Zhang: 1.) School of Civil Engineering, Hunan University of Science and Technology, Hunan 411201, China 2.) Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring, Hunan University of Science and Technology, Hunan 411201, China 3.) School of Civil Engineering, Central South University, Hunan 410075, China Zongyu Ma and Wenqing Peng: School of Resource and Environment and Safety Engineering, Hunan University of Science and Technology, Hunan, 411201, China Xuan Wang and Jiasheng Zhang:School of Civil Engineering, Central South University, Hunan 410075, China | ||