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为了获得宁波地区典型软黏土在温度荷载作用下的邓肯-张模型参数,在不同的温度和围压下,对宁波某工地现场的软黏土土样分别进行三轴固结不排水试验。通过分析软黏土的应力-应变曲线的特点,得到了相应的邓肯-张模型参数值,并归纳总结了各参数在温度荷载作用下的变化规律。试验结果表明,随着温度升高,软黏土邓肯-张模型参数中的黏聚力c、内摩擦角φ、试验参数K值呈减小的趋势,试验参数n和破坏比Rf值则呈增大趋势。试验所得的参数值可作为宁波地区岩土工程中软黏土分析计算的参考值。
In order to obtain the Duncan-Chang model parameters of typical soft clay under the temperature load in Ningbo area, the three-axis consolidation undrained test was carried out on soft clay soil at a site in Ningbo at different temperatures and confining pressures. By analyzing the characteristics of stress - strain curve of soft clay, the corresponding Duncan - Chang model parameters are obtained, and the variation rules of each parameter under temperature load are summarized. The experimental results show that as the temperature increases, the cohesion c, the friction angle φ and the K parameter of the Duncan-Chang model of soft clay show a decreasing tendency, while the experimental parameter n and the damage ratio Rf increase Trend. The parameters obtained from the test can be used as a reference value for analysis and calculation of soft clay in geotechnical engineering in Ningbo.