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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。
HSS model can be considered in the small strain range of soil shear modulus with the strain increases and attenuation of the characteristics of numerical analysis of excavation gradually get more use. A series of indoor experiments were carried out with the triaxial apparatus based on GDS system, the conventional consolidation instrument and the resonance column apparatus, and the typical soft soil layers in Shanghai (ie clay layer 2, silty silty clay layer 3, silt clay layer (Refs), E_ (50) ~ (ref), R_f, G_0 ~ (ref) of the hardened soil small strain constitutive model (HSS model) ref) and γ_ (0.7), as well as the relationship between the model parameters and the experimental results with the existing literature comparative analysis of the results. The numerical analysis of the engineering example shows that the calculated horizontal deformation of the retaining wall body is approximately equal to the measured value, which verifies the applicability of the HSS constitutive model and the parameter determination method proposed in this paper in the excavation analysis of the foundation pit in Shanghai soft soil area. With engineering reference value.