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Numerical investigation of secondary-fault rupture propagation through sandy deposits
Engineering Geology ( IF 7.4 ) Pub Date : 2021-07-01 , DOI: 10.1016/j.enggeo.2021.106258
Dionysios Chatzidakis , Yiannis Tsompanakis , Prodromos N. Psarropoulos

The increasing urban development in seismic-prone regions, in conjunction with the continuous construction of large-scale lifelines (i.e., road and railway networks, pipelines, etc.) has increased the risk of potential damages due to permanent displacements at the ground surface that can be caused by an earthquake fault rupture. Several recent earthquakes have revealed this risk. Therefore, the problem of fault rupture propagation of a single fault has been thoroughly investigated with field studies, as well as experimental tests and numerical models. Nevertheless, the presence of parallel or intersecting secondary fault ruptures is usually observed in the field due to stress redistributions and/or rock heterogeneities. The aim of the current study is to examine the rupture patterns and surface displacements caused by the contemporaneous rupture of a main fault and a perpendicular secondary fault. A three-dimensional numerical model has been developed utilizing the finite-element method in order to examine this complex phenomenon in sandy deposits. The soil behavior is represented quite accurately via an elastoplastic Mohr-Coulomb constitutive model with isotropic strain softening, which is initially validated with experimental results obtained by centrifuge tests in case of a single fault. Subsequently, a detailed parametric study has been performed, investigating different fault types and dip angles, as well as sandy layer thickness and material properties, to highlight various important aspects regarding the development and propagation of secondary fault ruptures and the resulting zones of excessive surface displacements.



中文翻译:

二次断层破裂通过砂质沉积物传播的数值研究

地震多发地区的城市发展不断增加,再加上大规模生命线(即公路和铁路网络、管道等)的不断建设,增加了由于地表永久位移而造成的潜在破坏的风险。可能是由地震断层破裂引起的。最近的几次地震都揭示了这种风险。因此,通过现场研究以及实验测试和数值模型,对单个断层的断层破裂传播问题进行了彻底的研究。然而,由于应力重新分布和/或岩石非均质性,通常在现场观察到平行或交叉的次生断层破裂的存在。当前研究的目的是检查由主断层和垂直次断层同时破裂引起的破裂模式和地表位移。利用有限元方法开发了一个三维数值模型,以检查砂质沉积物中的这种复杂现象。土壤行为通过具有各向同性应变软化的弹塑性 Mohr-Coulomb 本构模型非常准确地表示,该模型最初通过在单个断层情况下通过离心机测试获得的实验结果进行验证。随后,进行了详细的参数研究,调查了不同的断层类型和倾角,以及砂层厚度和材料特性,

更新日期:2021-07-07
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