Earthquake-Induced Catastrophic Landslide Risk Evaluation in Liquefiable Soils
Earthquake-Induced Catastrophic Landslide Risk Evaluation in Liquefiable Soils
复制标题
可液化土壤中地震引发的灾难性山体滑坡风险评估
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Sassa
中科院分区：
文献类型：
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作者：
A. Trandafir;K. Sassa
本文概述了一种方法，用于评估地震期间在可液化土壤中发生灾难性滑坡的可能性。该方法是基于一个修改后的Newmark滑动块体模型评估地震引起的不排水滑坡位移的条件下，没有剪应力逆转的滑动面。通过采用不排水单调环剪试验的抗剪位移关系，模拟模型包含了计算位移的屈服加速度的变化的敏感性。所提出的方法包括检查不排水地震斜坡的性能，根据不同的水平地震波形缩放到不同的峰值地震加速度的具体值。一个例子的问题说明了所提出的方法可以用来标定，永久地震位移的大小的基础上，低，中，高风险的灾难性滑坡的水平在一个平缓的斜坡上的饱和粘性土壤在地震过程中容易液化。
Synopsis This paper outlines a methodology for evaluating the likelihood of catastrophic landslide occurrence on gentle slopes in liquefiable soils during earthquake. The approach is based on a modified Newmark sliding block model of assessing the earthquake-induced undrained landslide displacements for conditions of no shear stress reversals on the sliding surface. By employing the shear resistance-displacement relationship from undrained monotonic ring shear tests, the simulation model incorporates the sensitivity of computed displacements to variations in yield acceleration. The proposed approach involves an examination of undrained seismic slope performance under various horizontal seismic waveforms scaled to different specific values of the peak earthquake acceleration. An example problem illustrates how the proposed methodology may be used to demarcate, based on the magnitude of permanent seismic displacement, the levels of low, moderate and high risk of catastrophic landslide on a gentle slope in a saturated cohesionless soil susceptible to liquefaction during earthquake.