Seismic-induced surficial failure of cohesive slopes using three-dimensional limit analysis: A case study of the Wangjiayan landslide in Beichuan, China

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL
Yufeng Gao, Yang Liu, Weijuan Geng, Fei Zhang
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引用次数: 0

Abstract

A seismic-induced landslide is a common geological catastrophe that occurs in nature. The Wangjiayan landslide, which was triggered by the Wenchuan earthquake, is a typical case in point. The Wanjiayan landslide caused many casualties and resulted in enormous property loss. This study constructs a simple surficial failure model based on the upper bound approach of three-dimensional (3D) limit analysis to evaluate the slope stability of the Wangjiayan case, while a traditional two-dimensional (2D) analysis is also conducted as a reference for comparison with the results of the 3D analysis. A quasi-static calculation is used to study the effect of the earthquake in terms of horizontal ground acceleration, while a parametric study is conducted to evaluate the critical cohesion of slopes. Rather than employing a 3D analysis, using the 2D analysis yields an underestimation regarding the safety factor. In the Wangjiayan landslide, the difference in the factors of safety between the 3D and 2D analyses can reach 20%. The sliding surface morphology as determined by the 3D method is similar to actual morphology, and the parameters of both are also compared to analyze the reliability of the proposed 3D method.

利用三维极限分析法研究地震诱发的粘性边坡表层破坏:中国北川王家岩滑坡案例研究
地震引发的山体滑坡是自然界中常见的地质灾害。汶川地震引发的王家岩滑坡就是一个典型的例子。王家岩滑坡造成了大量人员伤亡和巨大的财产损失。本研究基于三维(3D)极限分析的上限方法,构建了一个简单的表层破坏模型,以评估王家岩案例的边坡稳定性,同时还进行了传统的二维(2D)分析,作为与三维分析结果进行比较的参考。准静力计算用于研究地震对水平地面加速度的影响,而参数研究则用于评估斜坡的临界内聚力。采用二维分析比采用三维分析会低估安全系数。在王家岩滑坡中,三维和二维分析的安全系数相差可达 20%。三维方法确定的滑动面形态与实际形态相似,两者的参数也进行了比较,以分析建议的三维方法的可靠性。
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来源期刊
CiteScore
4.70
自引率
21.40%
发文量
1057
审稿时长
9 months
期刊介绍: Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.
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