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针对广泛应用于土工数值模拟分析中的邓肯-张模型,利用常规三轴压缩试验,对土工格栅加筋粘土的邓肯-张模型参数随含水率和加筋层数的变化规律进行研究。三轴压缩试验中含水率分别为17.5%,20%,22.5%,25%,加筋层为0,1,2层。研究结果表明,模型各参数随含水率和加筋层的变化都表现出一定的规律特征,尤其是含水率对参数c、φ、K、n、D的影响较为明显,可以认为含水率变化是引起土工格栅加筋粘土邓肯-张模型参数动态变化的重要原因;粘土加入土工格栅显著提高了粘土的φ、K、Rf值,在一定程度上说明了土工格栅加筋粘土的加筋效果。
Aiming at the Duncan - Chang model which is widely used in geotechnical numerical simulation, the Duncan - Chang model parameters of geogrid reinforced clays are studied with the variation of moisture content and stiffened layer using the conventional triaxial compression test. Triaxial compression test water content were 17.5%, 20%, 22.5%, 25%, reinforced layer 0,1,2 layer. The results show that the parameters of the model all exhibit certain regularity with the change of water content and stiffened layer, especially the effect of water content on parameters c, φ, K, n and D is obvious. The change of water content is Which leads to the dynamic change of geogrid-reinforced clay Duncan-Chang model. The addition of geogrid to clay increases the values of φ, K and Rf of clay significantly, which explains the reinforcement of geogrid-reinforced clay to a certain degree effect.