Abstract The current research is focused on the static liquefaction and effective stress path characteristics of soils of the high seismicity Kutch region, India. In previous studies, the effects of the fines content and the plasticity of the fines on the undrained behavior were explored in a controlled and systematic manner with either non-plastic or plastic fines added to standard or river sands. The undrained characteristics of natural soil deposits having the simultaneous presence of both silt and clay fractions have not been explored. In the present study, the effects of a varying fines content and the nature of the fines on the static liquefaction and effective stress path characteristics of various soil deposits in the Kutch region at their in-situ densities have been studied. Various liquefaction indices were determined to quantify the static liquefaction, namely, the undrained brittleness index, the collapse potential, the liquefaction potential, and the resistance to further deformation. The variation in these parameters was analyzed in the context of the fines content, silt content, clay content, and plasticity. The effective stress paths of the Kutch soils exhibited a strain softening, limited strain softening or strain hardening response and their behavior was controlled by the fines content and its nature. Due to the presence of non-plastic fines, and irrespective of the content, the silty sands exhibited intense strain softening which was captured by the liquefaction indices.

中文翻译：

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卡奇土的静态液化和有效应力路径响应

摘要 目前的研究重点是印度Kutch 高地震地区土壤的静态液化和有效应力路径特征。在以前的研究中，细粒含量和细粒可塑性对不排水行为的影响以受控和系统的方式进行了探索，将非塑性细粒或塑料细粒添加到标准砂或河沙中。尚未探索同时存在淤泥和粘土部分的天然土壤沉积物的不排水特性。在本研究中，研究了不同细粒含量和细粒性质对 Kutch 地区各种土壤沉积物在原位密度下的静态液化和有效应力路径特征的影响。确定了各种液化指数来量化静态液化，即不排水脆性指数、坍塌潜力、液化潜力和进一步变形的阻力。在细粒含量、淤泥含量、粘土含量和可塑性的背景下分析了这些参数的变化。Kutch 土壤的有效应力路径表现出应变软化、有限应变软化或应变硬化响应，它们的行为受细粒含量及其性质控制。由于非塑性细粒的存在，无论含量如何，粉砂质砂都表现出强烈的应变软化，液化指数可以捕捉到这一点。以及对进一步变形的抵抗力。在细粒含量、淤泥含量、粘土含量和可塑性的背景下分析了这些参数的变化。Kutch 土壤的有效应力路径表现出应变软化、有限应变软化或应变硬化响应，它们的行为受细粒含量及其性质控制。由于非塑性细粒的存在，无论其含量如何，粉砂质砂都表现出强烈的应变软化，这被液化指数捕获。以及对进一步变形的抵抗力。在细粒含量、淤泥含量、粘土含量和可塑性的背景下分析了这些参数的变化。Kutch 土壤的有效应力路径表现出应变软化、有限应变软化或应变硬化响应，它们的行为受细粒含量及其性质控制。由于非塑性细粒的存在，无论含量如何，粉砂质砂都表现出强烈的应变软化，液化指数可以捕捉到这一点。有限的应变软化或应变硬化反应，它们的行为受细粉含量及其性质控制。由于非塑性细粒的存在，无论含量如何，粉砂质砂都表现出强烈的应变软化，液化指数可以捕捉到这一点。有限的应变软化或应变硬化反应，它们的行为受细粉含量及其性质控制。由于非塑性细粒的存在，无论含量如何，粉砂质砂都表现出强烈的应变软化，液化指数可以捕捉到这一点。