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pseudo-static analysis of cantilever retaining walls using upper bound limit analysis approach

Journal of Central South University 2019年第1期26卷 241-255页

作者： Asadollah RANJBAR KARKANAKI Navid GANJIAN Farajollah ASKARI Department of Civil Engineering Science and Research Branch Islamic Azad University Iran International Earthquake Engineering Institute

Given the extensive utilization of cantilever retaining walls in construction and development projects,their optimal design and analysis with proper attention to seismic loads is a typical engineering *** research presents a new algorithm for pseudo-static analysis of retaining walls employing upper bound *** algorithm can be utilized to design and check the external and internal stability of the wall based on the proposed *** of the main features of this algorithm is its ability to determine the critical condition of failure wedges,the minimum safety factor and maximum force acting on the wall,as well as the minimum weight of the wall,simultaneously,by effectively using the multi-objective *** results obtained by the proposed failure mechanisms show that,while using the upper bound limit analysis approach,the active force should be maximized concurrent with optimizing the direction of the plane passing through the back of the *** present study also applies the proposed algorithm to determine the critical direction of the earthquake acceleration *** critical direction of earthquake acceleration coefficient is defined as the direction that maximizes the active force exerted on the wall and minimizes the safety factor for wall *** results obtained in this study are in good agreement with those of similar studies carried out based on the limit equilibrium method and finite element *** critical failure mechanisms were determined via optimization with genetic algorithm.

关键词： retaining wall upper bound pseudo-static analysis safety factor multi-objective optimization

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Improvement of pseudo-static Method for Slope Stability analysis

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Journal of Mountain Science 2014年第3期11卷 625-633页

作者： YANG Chang-wei ZHANG Jian-jing FU Xiao ZHU Chuan-bin BI Jun-wei School of Civil Engineering Key Laboratory of Transportation Tunnel Engineering Ministry of Education Southwest Jiaotong University

traditional In this paper, two drawbacks pseudo-static method （vertical of the slice method） in the slope stability evaluation have been studied. First, the sliding mass is divided into vertical slices according to this method, which is irrational to some extent in the seismic design of slope. Second, only peak ground acceleration （PGA） is considered, and the effects of shaking frequency and duration on slope stability are neglected. And then, based on the theory of elastic wave and the summarized geological model, this paper put forwards an improved method of pseudo-method by using the theory of elastic wave and Hilbert-Huang transform. The improved pseudostatic method gives reasonable considerations to the time-frequency effects of seismic wave and its rationality has been verified by the shaking table test. This method can evaluate the safety of a slope, the happening time and the scale of landslides. At the same time, this method also can improve the high accuracy of the evaluation of the safety of the slope.

关键词： pseudo-static analysis Slope stability Elastic wave Hilbert-Huang Transform Transfercoefficient slice

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Stability analysis of Rainfall-Triggered Toe-Cut Slopes and Effectiveness Evaluation of Pile-Anchor Structures

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Journal of Earth Science 2021年第5期32卷 1104-1112页

作者： Xi Xu Yuanchuang Xing Zhen Guo Yu Huang Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongji UniversityShanghai 200092China

Slope toe excavation strongly influences the stress balance of natural slopes and redistributes the stress of the slope body. Consequently, the sliding failure of toe-cut slopes is increasingly becoming more frequent, particularly in regions with persistent rainfall. The effects of external factors, namely, toe excavation and persistent rainfall, which lead to toe-cut slope failure were investigated through the numerical analysis of typical toe-cut slopes in the southeastern coastal region of China. Based on the grey relational theory, sensitivity analysis was carried out on the controlling factors to determine the degree of influence exerted by the external factors on the stability of toe-cut slopes. The stability analysis of toe-cut slopes reinforced by pileanchor structures under earthquake conditions was carried out using pseudo-static analysis. The safety factor of toe-cut slopes significantly decreases as the excavation height, rainfall duration, and rainfall intensity increase. The slope stability is more sensitive to the excavation height of a toe-cut slope than it is to rainfall. The stability of a toe-cut slope reinforced by a pile-anchor structure was also analyzed under rainfall and earthquake conditions using the limit equilibrium method and pseudo-static analysis, respectively. The slope stability significantly improved when the slope was reinforced by a pile-anchor structure, even when the slope was subjected to persistent rainfall and earthquakes. The findings of this study can provide important guidance for the prevention of geological disasters in mountainous areas.

关键词： toe-cut slope pile-anchor structure slope stability limit equilibrium method pseudo-static analysis

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Prediction of the seismic behavior of an underground railway station and a tunnel in Napoli(Italy)

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Underground Space 2017年第2期2卷 88-105页

作者： S.Fabozzi V.Licata S.Autuori E.Bilotta G.Russo F.Silvestri University of Napoli Federico II NapoliItaly

The assessment of the seismic safety of underground structures,either tunnels or large station boxes,should not be overlooked especially in densely populated areas,even with low to moderate *** underground structures,an important issue is the estimation of the seismic actions acting on the structure;only few experimental evidences are available for multi-level propped *** tunnels,it is generally assumed that their seismic behavior in soft ground is governed by the surrounding soil,while the inertial load contribution of the underground structure itself is *** both cases,recent numerical studies proved that advanced dynamic analyses can provide satisfactory interpretation of non-linear soil-structure interaction during *** this paper,a real case study,represented by a large open multi-propped excavation and a circular segmented tunnel in a densely urbanized area of the city center in Napoli,has been used to investigate some of the mentioned *** geotechnical characterization and choice of the reference input motions lead to a first estimate of the free-field ground motion,which was subsequently used for pseudo-static decoupled *** the complexity of both excavation geometry and staged construction,a full dynamic analysis was considered neither affordable nor reliable for the multi-propped station box;thus two conventional pseudo-static analyses,applying either a displacement-based or a force-based approach,were carried *** the case of the tunnel,the seismic increments of internal forces in the lining could be calculated through both a simplified pseudostatic analysis and a full dynamic analysis,showing a satisfying ***,the results of the study demonstrated that the seismic increments of internal forces in the diaphragm walls of the station and in the segmented lining of the tunnel were quite *** case study encourages improving the reliability of simplified methods based on the more

关键词： Underground structures Tunnels Diaphragm walls Seismic behavior pseudo-static analysis Dynamic analysis Soil-Structure interaction

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