Experimental research on parameter selection of HSS model for Ningbo shallow soft soil
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摘要: 小应变硬化土模型（HSS模型）因能考虑土体小应变特性，所得数值模拟结果通常更接近于实测值，因此在数值分析中得到广泛应用。目前，关于软土HSS模型参数的研究，主要集中在上海地区，其它地区的研究成果较少。通过室内试验方法对宁波地区的浅层软土进行HSS模型参数的取值研究，并与现有文献的统计成果进行对比，结果表明：大部分HSS模型参数的试验值处在统计范围之内，说明宁波浅层软土与其它地区的软土有其共通性；个别参数的试验值不在统计范围之内，说明宁波浅层软土亦有其地区差异性。Abstract: The small strain hardening soil model (HSS model) is widely used in numerical analysis because it can consider the small strain characteristics of soil, and the numerical simulation results are usually closer to the measured values. At present, the researches on the HSS model parameters of soft soil are mainly concentrated in Shanghai, and the research results in other areas are less. The HSS model parameters of shallow soft soil in Ningbo area are studied through indoor tests, and compared with the statistical results of the existing literatures. The results show that most of the HSS model parameters are within the statistical range, indicating that the Ningbo shallow soft soil has its commonness with that in other areas. The test values of some parameters are not within the statistical range, indicating that the Ningbo shallow soft soil also has its regional differences.
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Keywords:
- soft soil /
- HSS model /
- small strain parameter /
- resonance column test
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图 1 标准固结试验竖向荷载与竖向应变关系图
Figure 1. Relationship between load and strain of consolidation tests
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图 4 三轴固结排水加卸载剪切试验应力应变关系曲线
Figure 4. Strain-stress curves of triaxial CD loading-unloading- reloading tests
表 1 部分HSS模型参数经验取值[12]
Table 1 Empirical values of partial HSS model parameters
参数 ψ K0 νur m 经验取值 0 1-sinφ' 0.2 0.5~1.0 
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表 2 基本物理性质参数
Table 2 Basic physical property parameters
取样地层 天然密度
ρ/(g·cm-3)天然含水率
w/%初始孔隙比
e0②-2 1.68 62.7 1.67
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表 3 HSS模型参数及参考模量比例关系汇总
Table 3 Summary of HSS model parameters and proportional relation of reference modulus
土层编号 Eoedref/MPa E50ref/MPa Eurref/MPa Rf G0ref/MPa γ0.7/10-4 Eoedref/Es1-2 E50ref/ Eoedref Eurref/ Eoedref G0ref/Eurref ②-2 0.98 1.2 15.7 0.5 33.8 2.78 1.10 1.22 16.02 2.15
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