上海临港砂质粉土硬化土小应变模型参数研究

硬化土小应变模型(HSS模型)考虑了土体在小应变区域内刚度随应变的非线性变化,是土工数值分析中应用较为广泛的软土本构模型之一。上海地区软土的特性研究已取得了较为丰富的成果,但关于浅层砂质粉土的研究还不够全面。通过三轴固结排水剪切试验,三轴固结加卸载试验,固结试验以及共振柱试验,获得上海临港地区浅层砂质粉土的硬化土小应变本构模型的试验参数,包括土体的初始剪切模量、土体强度参数和加卸载模量等。将试验结果与已有文献的相关数据进行对比分析,试验结果可为上海地区浅层砂质粉土的深基坑工程数值分析提供参考数据,具有工程参考价值。

Parameters of Hardening Soil Model with Small Strain of Shallow Sandy Silt in Shanghai Lin-Gang Special Area

The hardening soil model with small strain (HSS model) has become one of the most widely used constitutive models in numerical analysis of excavations because it can reflect the attenuation of soils with strain in tiny strain range. The research on small strain shear modulus of silty sand is inconsistent, despite the fact that great progress has been made in the research of typical soft soils in Shanghai. In this study, through triaxial consolidated drained test, triaxial loading-unloading-reloading drained test, consolidation test and resonance column test to measure the small strain stiffness properties of silty sand in Shanghai. The parameters for Lin-Gang involved in the hardening soil model with small strain stiffness, including the initial shear modulus, the soil strength parameters and unloading and reloading modulus. The measured parameters are compared with other soils in Shanghai and verified through practical engineering. The test results can be used as references for numerical analysis of excavation in Shanghai. It is of reference value to similar engineering.