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通过开展饱和软黏土温控动三轴试验,研究了不同温度作用下土的不排水累积变形、孔压、阻尼比及动弹性模量变化规律,建立了考虑温度、初始静偏应力、围压、超固结比等影响的应变模型,并获得了模型参数与温度的关系。结果表明:温度对土的累积塑性变形、孔压、阻尼比及动弹性模量有较大影响,土体的累积塑性应变、孔压、阻尼比均随着温度升高而减小,动弹性模量则随着温度升高而增大,土体表现出热硬化特征;在不同温度作用下,考虑温度影响的应变模型计算结果与试验结果较为吻合,验证了模型的合理性,可用于预测同一试验工况下任意温度时土的累积塑性应变结果。
Based on the temperature-controlled triaxial tests of saturated soft clay, the cumulative displacement, pore pressure, damping ratio and dynamic elastic modulus of soil under different temperatures were studied. The effects of temperature, initial static deviatoric stress, confining pressure , Overconsolidation ratio and other effects of strain model, and obtained the relationship between model parameters and temperature. The results show that temperature has a great influence on the cumulative plastic deformation, pore pressure, damping ratio and dynamic elastic modulus of soil. The cumulative plastic strain, pore pressure and damping ratio of soil decrease with increasing temperature. The modulus increases with the increase of temperature and the soil shows the characteristics of thermosetting. Under different temperatures, the calculation results of the strain model considering temperature influence are in good agreement with the experimental results, which verify the rationality of the model and can be used to predict The cumulative plastic strain of soil at any temperature under the same experimental conditions.