考虑小应变下刚度衰减特征的软土本构模型

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英文篇名：Constitutive Model of Soft Soil After Considering Small Strain Stiffness Decay Characteristics 作者：张硕 ; 叶冠林 ; 甄亮 ; 李明广 ; 陈超斌 英文作者：ZHANG Shuo;YE Guanlin;ZHEN liang;LI Mingguang;CHEN Chaobin;Department of Civil Engineering, Shanghai Jiao Tong University;Shanghai Road and Bridge (Group) Co., Ltd.; 关键词：软土 ; 本构模型 ; 小应变 ; 非线性 ; 结构 ; 超固结性 英文关键词：soft soil;;constitutive model;;small strain;;nonlinearity;;structure;;over consolidation 中文刊名：SHJT 英文刊名：Journal of Shanghai Jiaotong University 机构：上海交通大学土木工程系;上海公路桥梁(集团)有限公司顶管事业部; 出版日期：2019-05-28 出版单位：上海交通大学学报 年：2019 期：v.53;No.399 基金：国家自然科学基金资助项目(41727802) 语种：中文; 页：SHJT201905006 页数：5 CN：05 ISSN：31-1466/U 分类号：27-31

摘要

针对上海软土统一本构模型不能模拟小应变情况下土体剪切模量的衰减特征问题,结合小应变下经典刚度理论对小应变范围内的上海软土统一本构模型进行改进,以使软土本构模型能够模拟土体在小应变下的刚度变化规律,并将模拟结果与上海浅层软土在小应变下的三轴剪切试验结果进行对比,以验证改进的软土本构模型的合理性.结果表明,改进的软土本构模型能够模拟小应变情况下土体较高的初始切变模量及其非线性衰减特征,并能够较好地表征自然黏土体的结构和超固结特性.
        Although the Shanghai soil unified model can describe the influence of soil structure and over consolidation, it cannot simulate the highly nonlinear modulus in small strain range. In this paper, combined with the classical theory of small strain stiffness, a small strain constitutive model based on Shanghai soil unified model is developed. The small strain constitutive model can describe the change rule of soil stiffness in the small strain range. The capability of the model is checked by the triaxial compression test results on Shanghai shallow soil. The results show that small strain constitutive model can describe that soil stiffness in the small strain range has initial high modulus and the non-linear attenuation characteristics, and the influence of structure and over consolidation on soil can also be reproduce well by the model.

引文

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