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采用柔性真三轴仪对上海粉细砂进行了一系列不同中主应力系数条件下的真三轴试验,针对中主应力对粉细砂强度特性的影响进行了系统分析。基于真三轴试验结果对Mohr-Coulomb强度准则的形状函数进行了改进,并采用试验结果对强度准则进行验证。结果表明,建立在真三轴试验基础上的强度准则能更准确地反映砂土三维应力状态下的强度特性。
The true triaxial test was carried out on a series of different middle principal stress coefficients of Shanghai silty sand using a flexible true triaxial apparatus. The influence of middle principal stress on the strength characteristics of silty sand was systematically analyzed. Based on the true triaxial test results, the shape function of Mohr-Coulomb strength criterion is improved, and the strength criterion is verified by the test results. The results show that the strength criterion based on true triaxial tests can more accurately reflect the strength characteristics of sand under three-dimensional stress conditions.