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

Geoscience Frontiers 2021年第5期12卷 374-383页

作者： Jian Ji Zheming Zhang Zhijun Wu Jiacheng Xia Yongxin Wu Qing Lüc Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjingChina School of Civil Engineering Wuhan UniversityWuhanChina c College of Civil EngineeringZhejiang UniversityHangzhouChina

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.

关键词： Tunnel face stability Support pressure Finite element limit analysis Inverse reliability analysis probabilistic design

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GEOSTATISTICAL DATA AND STOCHASTIC-PHYSICAL ANALYSIS AS A BASIS FOR ESTIMATING RISK OF INTERNAL EROSION

GEOSTATISTICAL DATA AND STOCHASTIC-PHYSICAL ANALYSIS AS A BA...

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International Symposium on Modern Technology of Dams--The 4th EADC Symposium

作者： Anders Wrman Dept.of Water and Land Resources Engineering The Royal Institute of Technology 10044 Stockholm

＜正＞A modelling framework for internal erosion in heterogeneous stratified soils has been developed by combining existing methods used to study sediment transport in canals,filtration phenomena and stochastic *** framework is used to study the erosion process in an anomalous zone through the central core of an embankment *** data on core properties are linked to the probability that a critical erosion phase is exceeded and it is shown that most moraine cores naturally are subjected to a high probability for piping unless the downstream vertical filters are working *** stochastic approach is found to be suitable as a part of risk analyses of extreme events for which empirical observations are rare,such as failure of embankment *** evaluation requires site-specific data on several properties of the core material as well as data on the variability in the soil.

关键词： Embankment dam internal erosion probabilistic design risk assessment

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