Experimental and numerical investigations of dyke failures involving soft materials
Experimental and numerical investigations of dyke failures involving soft materials
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DOI：
10.1016/j.enggeo.2016.07.006
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发表时间：
2017-03
影响因子：
7.4
通讯作者：
E. Fern;D. Lange;C. Zwanenburg-;J. Teunissen;A. Rohe;K. Soga
中科院分区：
文献类型：
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作者：
E. Fern;D. Lange;C. Zwanenburg-;J. Teunissen;A. Rohe;K. Soga
本文介绍了涉及软土的堤坝垮塌的实验和数值研究的结果。进行了九次离心机试验来研究堤坝与底土的相互作用。测试包括在底土上放置由 Speswhite 粘土或 Baskarp 沙制成的堤坝。交替改变堤坝和底土，以探索从软底土上的硬堤坝到硬底土上的软堤坝的不同刚度对比。将小型模型放置在离心机中，并逐渐加速至最大 100 G。然后通过粒子图像测速 (PIV) 处理记录，提供对变形和失效机制的深入了解。结果表明，放置在坚硬地基上的堤坝会随着滑移面的发展而发生脆性破坏，而放置在软性地基上的同一堤坝会发生大变形，从而出现使用性问题。然后使用质点法（MPM）对这些测试进行建模，这是一种基于连续体的数值模拟方法，专用于大变形问题。使用简单的本构模型，可以使用状态指数来估计参数。
This paper presents the results of an experimental and numerical investigation on the collapse of dykes involving soft soils. Nine centrifuge tests were carried out to investigate the dyke-subsoil interaction. The tests consisted in placing a dyke made out of Speswhite clay or Baskarp sand on a subsoil. The dykes and the subsoils were alternatively changed to explore the different contrast in stiffness ranging from stiff dykes on soft subsoil to soft dykes on stiff subsoils. The small scale models were placed in the centrifuge and were progressively accelerated up to a maximum of 100 G. The recordings, which were then processed by Particle Image Velocimetry (PIV), offered an insight onto the deformation and failure mechanisms. The results showed that dykes placed on a stiff subsoil underwent brittle failures with the development of slip surfaces whereas the same dyke placed on a soft subsoil underwent large deformation which presented a serviceability issue. These tests were then modelled with the Material Point Method (MPM), which is a continuum-based method for numerical simulation dedicated for large deformation problems. Simple constitutive models were used for which the parameters could be estimated using state indices.