三七灰土本构关系及强度性质试验

对6种含水率、4种不同围压条件下的灰土试样进行了室内不固结、不排水的三轴试验，探讨了不同含水率试样适用的本构模型及其强度变化规律。试验结果表明：灰土的脆塑性受含水率和围压共同制约，不同含水率情况下，灰土的应力-应变关系有着不同的形式，在含水率较低时可采用胡克模型，含水率较高时采用邓肯-张模型更为合理，这一含水率界限应在塑限附近；三七灰土的强度参数均可由含水率和围压给出；所得结论可为三七灰土工程数值模拟计算提供参考，具有工程应用价值。

Experiment on Constitutive Relation and Strength Properties of Three-to-seven Lime-loess

In order to investigate the suitable constitutive model of different moisture content samples and intensity variation, authors designed multiple unconsolidated and undrained triaxialtests of 6 kinds of moisture contents and 4 different confining pressures. The test results show that brittleness and plasticity of lime-loess is influenced by moisture content and confiningpressure actually, the stress-strain curve changes with the variation of moisture content, Hooke model is applicable when the moisture content is low,on the contrary, Duncan-Chang model canbe only used in a situation of high moisture content, this boundary of moisture content should be near the plastic limit based on those tests, and strength parameters can be given by moisturecontent and confining pressure. The conclusions can provide a reference to the numerical simulation of three-to-seven lime-loess, and have great significance in application engineering.