An efficient probabilistic design approach for tunnel face stability by inverse reliability analysis

作     者：Jian Ji Zheming Zhang Zhijun Wu Jiacheng Xia Yongxin Wu Qing Lüc Jian Ji;Zheming Zhang;Zhijun Wu;Jiacheng Xia;Yongxin Wu;Qing Lü

作者机构：Key Laboratory of Ministry of Education for Geomechanics and Embankment EngineeringHohai UniversityNanjingChina School of Civil EngineeringWuhan UniversityWuhanChina c College of Civil EngineeringZhejiang UniversityHangzhouChina 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2021年第12卷第5期

页      面：374-383页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：supported by the Natural Science Foundation of China[NSFC Grant Nos.51879091,52079045,41772287] support from the Key R&D Project of Zhejiang Province(2021C03159) 

主　　题：Tunnel face stability Support pressure Finite element limit analysis Inverse reliability analysis Probabilistic design 

摘      要：In order to maintain the safety of underground constructions that significantly involve geo-material uncertainties,this paper delivers a new computation framework for conducting reliability-based design(RBD)of shallow tunnel face stability,utilizing a simplified inverse first-order reliability method(FORM).The limit state functions defining tunnel face stability are established for both collapse and blow-out modes of the tunnel face failure,respectively,and the deterministic results of the tunnel face support pressure are obtained through three-dimensional finite element limit analysis(FELA).Because the inverse reliability method can directly capture the design support pressure according to prescribed target reliability index,the computational cost for probabilistic design of tunnel face stability is greatly *** comparison with Monte Carlo simulation results,the accuracy and feasibility of the proposed method are ***,this study presents a series of reliability-based design charts for vividly understanding the limit support pressure on tunnel face in both cohesionless(sandy)soil and cohesive soil stratums,and their optimal support pressure ranges are *** results show that in the case of sandy soil stratum,the blowout failure of tunnel face is extremely unlikely,whereas the collapse is the only possible failure *** parametric study of various geotechnical uncertainties also reveals that ignoring the potential correlation between soil shear strength parameters will lead to over-designed support pressure,and the coefficient of variation of internal friction angle has a greater influence on the tunnel face failure probability than that of the cohesion.