Elastoplastic finite element simulation of domino fault formation associated with tilting of highly structured ground

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
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Abstract

Ground deformation on the Earth’s surface layer is strongly affected by the nonlinearity of geomaterials. However, the formation process of such deformation has yet to be described in a unified manner based on mechanics. The present study focuses on the normal faults in a submarine ground with highly developed soil skeleton structures and attempts to reproduce the process of normal fault formation associated with the tilting of a horizontally deposited submarine ground using an elastoplastic finite element simulation. The simulation was conducted using the soil–water coupled finite deformation analysis code GEOASIA, which incorporates an elastoplastic constitutive equation of the soil skeleton based on the modified Cam-clay model and the soil skeleton structure concept. The key findings are as follows:

1) Normal faults are formed from the ground surface to depth as shear bands, where shear strain is localized while exhibiting softening behavior with plastic volume compression.

2) Multiple normal faults are almost equally spaced and parallel to each other, with the inter-fault blocks rotating backward. The morphology of normal faults formed by the tilting of the ground shows domino-style characteristics.

3) The degree of the soil skeleton structure influences the formation of normal faults.

This study demonstrates that elastoplastic geomechanics can explain the formation process of ground deformation, which has usually been interpreted from the perspectives of geomorphology and geology.

与高结构地层倾斜相关的多米诺断层形成的弹塑性有限元模拟
地球表层的地面变形受到土工材料非线性的强烈影响。然而,这种变形的形成过程尚未得到基于力学的统一描述。本研究侧重于具有高度发达土壤骨架结构的海底地层中的法向断层,并尝试使用弹塑性有限元模拟再现与水平沉积海底地层倾斜相关的法向断层形成过程。模拟使用了水土耦合有限变形分析代码 GEOASIA,其中包含了基于修正的 Cam-clay 模型和土壤骨架结构概念的土壤骨架弹塑性构成方程。主要结论如下:1)法向断层从地表到地层深处形成剪切带,剪切应变局部化,同时表现出塑性体积压缩软化行为。这项研究表明,弹塑性地质力学可以解释地面变形的形成过程,而地面变形通常是从地貌学和地质学的角度来解释的。
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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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