裂隙性黄土的双参数二元介质模型

Double-parameter binary-medium model for fissured loess

裂隙性黄土可以看成是由胶结块和软弱带组成的非均质土,其变形破坏过程是土中胶结块和软弱带的变形、破损和连通过程。基于岩土破损力学理论建立了裂隙性黄土的双参数二元介质模型,并用三轴剪切试验结果进行了对比,结果显示该模型能计算模拟裂隙性黄土的不同变形阶段,并能反映裂隙性黄土的脆性破损和应变软化现象,说明岩土破损力学理论对裂隙性黄土具有较好的适应性。

Fissured loess is regarded as a heterogeneous soil consisting of bonded blocks and weakened bands.The process of deformation failure of the fissured loess is the deformation,breakage and connection of the bonded blocks and weakened bands in loess.A double-parameter binary-medium model for fissured loess is proposed based on the breakage mechanics and is used to predict the behaviors of the fissured loess in triaxial shear tests.The comparison between prediction and experimental data demonstrates that the proposed model can satisfactorily simulate different deformation phases and reflect the brittle breakage and strain softening of the fissured loess.