上海地区软土HSS模型参数的试验研究

发布时间：2018-09-15 19:00

【摘要】：HSS模型可以考虑小应变范围内土体剪切模量随应变增大而衰减的特点,在基坑开挖数值分析中逐渐得到较多的运用。通过基于GDS系统的三轴仪、常规固结仪和共振柱仪完成系列的室内试验,获得了上海地区典型软土层(也即黏土层2、淤泥质粉质黏土层3、淤泥质黏土层4和粉质黏土层5)的硬化土小应变本构模型(HSS模型)参数c',φ',E_(oed)~(ref),E_(50)~(ref),R_f,G_0~(ref)和γ_(0.7),以及模型参数之间的比例关系,并将试验结果与已有文献的相关结果进行对比分析。通过工程实例的数值分析表明,围护墙体水平变形计算值和实测值大致相等,验证了HSS本构模型以及本文提出的参数确定方法在上海软土地区基坑开挖分析中的适用性,具有工程参考价值。
[Abstract]:The HSS model can take into account the attenuation of soil shear modulus with the increase of strain in the range of small strain, and has been applied more and more in the numerical analysis of foundation pit excavation. Through the triaxial instrument based on GDS system, the conventional consolidation instrument and the resonance column instrument to complete the series of indoor tests, The small strain constitutive model (HSS model) parameters of hardened soils (i.e. clay layer 2, silty clay layer 3, silty clay layer 4 and silty clay layer 5) in Shanghai are obtained. The relationship between the parameters of the small strain constitutive model (HSS model) and the parameters of the model is obtained. The experimental results are compared with the related results of previous literatures. The numerical analysis of engineering example shows that the calculated value of horizontal deformation of retaining wall is approximately equal to the measured value, which verifies the applicability of HSS constitutive model and the parameter determination method proposed in this paper in the excavation analysis of foundation pit in soft soil area of Shanghai. It has engineering reference value.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家重点研发计划项目(2016YFC0800204) 上海市科技攻关计划项目(09231200900)
【分类号】：TU41;TU447

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