结构性土二元介质本构模型及破损率影响因素的研究

岩土类材料是非均质的具有微缺陷的天然材料，岩土破损力学将岩土材料抽象成由结构块和结构带组成的非均质二元结构体。破损率演化方程反映了岩土材料在外部荷载作用下，结构块向结构带动态变化程度的过程。从细观尺度上分析结构性土体变形、破坏过程发展机制，揭示土体在荷载作用下结构块向结构带转化的过程。最后，针对杨陵黄土，通过三轴剪切试验，研究围压、含水率对破损率演化规律的影响。研究结果表明，单参数模型的破损率与围压和含水率没有关系，使从实验上证明参数模型的破损率是大主应变的函数。

Structural soil binary-medium constitutive model and factor of breakage ratio influence

Geological materials are inhomogeneous natural materials having micro cracks and micro voids.Under the theoretical framework of breakage mechanics for geological material,the geomaterials are conceptualized as binary medium consisting of bonded blocks and bonded bands,evolvement equation of breakage ratio are reflectrd the fracture process degree of the transformation of fracturing or breaking of bonded blocks into bonded bands in the process of loading,which are analysed deformation and breakage development speciality,showed the change course of bonded blocks into bonded bands under loading.Finally,aimed at the loess in Yanglin region,through triaxial shear test,the influences of confining pressure and water content on the breakage rate evolution are studied.The results show that the breakage ratio of simple parameter binary-medium mode has no relation of the confining pressure and water content,it is the function of maximum principal strain from the test.