Two and three-dimensional numerical analysis of the progressive failure that occurred in an excavation-induced landslide
Two and three-dimensional numerical analysis of the progressive failure that occurred in an excavation-induced landslide
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DOI：
10.1016/j.enggeo.2014.08.027
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发表时间：
2014-12
影响因子：
7.4
通讯作者：
A. Troncone;E. Conte;Antonio Donato
中科院分区：
文献类型：
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作者：
A. Troncone;E. Conte;Antonio Donato
采用有限元方法，其中包括一个弹粘塑性应变软化模型，是用来分析后发生的滑坡深开挖已进行了建设的几个建筑物在坡脚。参与滑坡的土壤的特点是一个显着的应变软化行为与剪切强度，突然减少塑性应变的增加。众所周知，开挖可能会引发这些土壤的渐进破坏，并可能导致边坡在一段时间后坍塌。在本研究中使用的数值方法可以适当地模拟这种现象。滑坡的二维（2D）和三维（3D）分析的结果进行。这些分析的结果证实了边坡内发生了渐进式破坏。然而，2D分析不能完全解释发生的失效过程，因为该过程的3D性质在向上和横向方向上传播。通过执行3D分析实现了对边坡破坏的更真实的模拟。
A finite element approach, in which an elasto-viscoplastic strain-softening model is incorporated, is used to analyse a landslide that occurred after deep excavations had been carried out for the construction of several buildings at the toe of the slope. The soils involved in the landslide were characterized by a pronounced strain-softening behaviour with the shear strength that abruptly reduces as plastic strain increases. As is well-known, a progressive failure may be triggered in these soils by excavation and it can cause the collapse of the slope after some time. The numerical approach used in the present study allows this phenomenon to be properly simulated. Results from both two-dimensional (2D) and three-dimensional (3D) analyses of the landslide are performed. The results from these analyses confirm the occurrence of a progressive failure within the slope. However, the 2D analysis does not completely account for the failure process that occurred, because of the 3D nature of this process that propagated in both upward and lateral directions. A more realistic simulation of the slope failure is achieved by performing a 3D analysis.