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为了研究土体结构破坏对软黏土一维变形的时效特性的影响,在Bjerrum的等时间线体系基础上,提出了等黏塑性应变率线等黏塑性应变率线概念,建立了非结构性软黏土的一维弹黏塑性模型;为了描述土体结构渐进破坏特征,定义了结构性参数——结构应变,在非结构性模型的基础上推导了结构性软黏土一维弹黏塑性模型;讨论了通过试验法直接确定模型参数的方法,并利用新建模型对温州天然软黏土的一维常规压缩试验、天然Ariake黏土的分级快速固结试验、结构性Berthierville黏土的一维等应变率压缩试验及长期蠕变试验进行模拟。模拟与试验结果的对比表明,该模型能较好地描述结构性软黏土一维压缩变形的时效特征。
In order to study the effect of soil structure failure on the aging characteristics of one-dimensional deformation of soft clay, based on Bjerrum’s isochronism system, the concept of visco-plastic strain rate line such as isostatical strain rate line was proposed, Dimensional elasto-viscoplastic model of clay; in order to describe the gradual failure characteristics of soil structure, the structural parameter-structure strain is defined, one-dimensional elasto-viscoplastic model of structural soft clay is deduced based on the non-structural model The method of determining the parameters of the model by the test method was established. One-dimensional conventional compression test of natural soft clay in Wenzhou, the rapid consolidation test of natural Ariake clay, the one-dimensional constant strain rate compression test of structural Berthierville clay, Long-term creep test to simulate. The comparison between the simulation results and the experimental results shows that the model can well describe the aging characteristics of one-dimensional compressive deformation of structural soft clay.