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侧向推力对开挖和降雨条件下边坡渐进性破坏的影响。

The effect of lateral thrust on the progressive slope failure under excavation and rainfall conditions.

作者信息

Yu Xiang, Zhao Tao, Gong Bin, Zhang Yongjun, Tang Chun'an, Luo Yu

机构信息

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024 China.

Department of Civil and Environmental Engineering, Brunel University London, London, UB8 3PH UK.

出版信息

Nat Hazards (Dordr). 2024;120(12):10807-10833. doi: 10.1007/s11069-024-06635-9. Epub 2024 May 2.

DOI:10.1007/s11069-024-06635-9
PMID:39371427
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11452464/
Abstract

Large landslides can involve the multiple failures of regional slopes. To understand the effect of lateral thrust caused by the failure of one slope on its surroundings, the failures of two adjacent highway slopes in Guangdong Province, China, were investigated in detail. The interactive failure processes and landslide morphological characteristics of the two slopes were first analyzed based on the on-site investigation. Then, a plane mechanical model of a large-scale slope was established to evaluate the significant influence of the lateral thrust generated by the west slope acting on the east excavated slope. Furthermore, the extrusion effect of the west slope was modelled under the alternate excavation disturbance and rainfall by transferring the thrust forces onto the interface elements, and the induced failure mechanism and instability mode of the east slope under lateral thrust were reproduced numerically. The results show that the compression-shear failure occurred at the middle and rear slope bodies because of the lateral thrust, which led to the formation of a thrust landslide and the final instability of the east slope.

摘要

大型滑坡可能涉及区域边坡的多次失稳。为了解一个边坡失稳产生的侧向推力对其周边环境的影响，对中国广东省两条相邻公路边坡的失稳情况进行了详细调查。首先基于现场勘查分析了两个边坡的相互作用失稳过程及滑坡形态特征。然后，建立了一个大型边坡的平面力学模型，以评估西坡产生的侧向推力对东开挖边坡的显著影响。此外，通过将推力转移到界面单元上，模拟了西坡在交替开挖扰动和降雨作用下的挤压效应，并数值再现了东边坡在侧向推力作用下的诱发破坏机制和失稳模式。结果表明，由于侧向推力，中后部坡体发生压剪破坏，导致推力滑坡的形成和东边坡的最终失稳。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd6f/11452464/597a4eba1893/11069_2024_6635_Fig11_HTML.jpg
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