Failure mechanism of toppling in anti-dip layered rock slope: a case study of the Xiangpingshan landslide in southwest China

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-13 DOI:10.1007/s10064-024-04026-9

Changkui Wang, Leilei Jin, Wenxi Fu, Fei Ye, Rui Qian, Guangchao Lv, Shuang Yao

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引用次数: 0

Abstract

Landslides significantly impact human engineering practices. In the Wenshan section of the Tianbao-Houqiao Expressway in Yunnan, China, three closely spaced deformation zones emerged within the Xiangpingshan slope. Despite multiple rounds of reinforcement measures, including anti-slide piles and slope cutting excavations, one of these zones continued to experience deformation, posing a serious threat to both human life and property and causing frequent expressway closures. This study aims to analyze the surface features, deformation characteristics, and failure mechanisms of these deformation zones through detailed field investigations, InSAR analysis, numerical simulations, and monitoring data. The results show that the Xiangpingshan slope is an ancient landslide, characterized as an anti-dip layered rock slope. Engineering disturbance is the main triggering factor for these deformation zones. Zones I and II exhibit shallow deformation caused by sliding of the overburden. Zone III exhibits deep-seated deformation resulting from excavation disturbances. These disturbances initially triggered overburden sliding, followed by the sliding of the bedrock along fracture zones. A sliding-toppling failure mode is proposed for such slopes, which primarily occurs in anti-dip soft rock slopes. Reducing excavation and providing timely support after excavation, is crucial to prevent bedrock disturbance and the onset of deep-seated deformation. Additionally, this paper uses the Xiangpingshan landslide as a case study to summarize the multi-phase catastrophic process of large-scale toppling slopes, offering valuable insights for similar engineering projects.

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.