Analysis of earthquake fault rupture propagation through cohesive soil
Analysis of earthquake fault rupture propagation through cohesive soil
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DOI：
10.1061/(asce)0733-9410(1994)120:3(562
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发表时间：
1994-03
期刊：
影响因子：
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通讯作者：
J. Bray;R. Seed;H. Seed
中科院分区：
文献类型：
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作者：
J. Bray;R. Seed;H. Seed
对地震断层破裂通过饱和粘土传播的更好理解将有助于工程师在粘性土覆盖潜在活动断层的地区选址和设计设施。数值分析的结果表明，有限元法可以应用于这类问题，只要土壤的非线性应力-应变行为是适当的模拟。结果表明，在给定基岩断层位移下，上覆饱和粘土剪切破裂带的高度主要取决于土体的破坏应变。随着粘土破坏应变的减小，基岩断层上覆粘土中的剪切破裂带以特定的基底位移进一步扩展。其他材料参数如土体抗剪强度和刚度也会影响断层破裂过程，但影响程度不超过破坏应变。穿过土壤的剪切破裂带的方向很大程度上取决于下伏基岩断层面的方向。
An improved understanding of earthquake fault rupture propagation through saturated clay would assist engineers in siting and designing facilities to be constructed in regions where cohesive soils overlie potentially active faults. The results from numerical analyses suggest that the finite-element method can be applied to this class of problem provided that the soil's nonlinear stress-strain behavior is adequately modeled. It was found that the height of the shear rupture zone in the overlying saturated clay soil at a specified base rock fault displacement depends primarily on the soil's failure strain. As the clay's failure strain decreases, the shear rupture zone in the clay overlying the bedrock fault propagates further at a specified base displacement. Other material parameters such as soil shear strength and stiffness also affect the fault rupture process, but not to the extent of failure strain. The orientation of the shear rupture zone through the soil depends largely on the orientation of the underlying bedrock fault plane.