结构性粘土的弹塑性损伤模型

An Eiasto-piastic Damage Model for Cemented Clays

本文从损伤力学观点出发,建议了一个可以考虑粘土结构破损过程的损伤力学模型,推导了弹塑性损伤矩阵,并制定了相应的计算方法和编制了比奥固结理论的有限元计算程序。模型的计算参数共有9个,可以方便地通过原状土的有侧限和无侧限压缩试验测定。文中从湛江粘土的试验资料出发整理了计算参数,并就10m厚粘土地基上承受均布条形荷载的算例进行了计算,结果定性地与国内外原观资料一致。

A constitutive model based on the concepts of damage mechanics has been developed for cemented clays. This model can simulate the process of progressive failure of clays due to the breakage of inter-particle bonding. Accordingly, an elasto-plastic damage matrix has been deduced and a finite element program CONDAM has been compiled based on Biot's consolidation theory. This model contains 9 parameters which can be easily determined by conventional both confined and unconfined compression test. As an illustration, the test results of Zhanjiang clay and the computed responses of a 10m thick clay foundation under strip surface loading are presented.