New dynamic procedure for back-calculating the shear strength parameters of large landslides
New dynamic procedure for back-calculating the shear strength parameters of large landslides
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DOI：
10.1016/j.enggeo.2011.01.010
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发表时间：
2011-11
影响因子：
7.4
通讯作者：
Jian Hong Wu;P. Tsai
中科院分区：
文献类型：
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作者：
Jian Hong Wu;P. Tsai
以台湾草岭滑坡和丘芬山滑坡为例，对所提出的大型滑坡滑动面抗剪强度参数动态反演法进行了验证。这种新方法使用了Newmark滑动模型，同时考虑了临界位移概念。新方法的前提是，在稳定的边坡中，反计算往往低估了抗剪强度；然而，随着地震动强度的增加和边坡接近破坏，反计算的抗剪强度将接近真实的值。基于这一概念，开发了新的程序(方法)，并用两个记录良好的病例进行了验证。用该方法反算得到的抗剪强度参数与文献报道的结果吻合较好。新的动态反演法特别适用于地下水监测资料缺乏的情况。因此，该方法是对传统的基于地下水的极限平衡反演法的补充。
Case histories of the Tsaoling landslide and the Chiu-fen-erh-shan landslide, both located in Taiwan, are used in this study to validate the procedure proposed for the dynamic back-calculation of the shear strength parameters of the sliding surfaces of large landslides. This new procedure uses the Newmark sliding model while simultaneously considering the critical displacement concept. The premise of the new procedure is that, in a stable slope, back-calculation tends to underestimate the shear strength; however, as the intensity of earthquake shaking increases and the slope approaches failure, the back-calculated shear strength will approach to the “true” value. Based on this concept, the new procedure (method) is developed and validated with the two well-documented case histories. The shear strength parameters back-calculated using the proposed method agree well with those reported in the literature. The new dynamic back-calculation procedure is especially suitable in the situation where groundwater monitoring data are unavailable. Thus, the new method is complementary to the traditional groundwater-based limiting equilibrium back calculation approach.