考虑流变特性的正常固结土一维固结分析

摘要

引入修正的孔隙比变化值和时间对数的线性关系式来描述正常固结饱和黏土固结过程中的流变现象,修正了太沙基一维固结方程,并给出了有限体积法数值计算格式.据此探讨了流变参数对正常固结土固结过程的影响.计算结果表明,流变效应延缓了黏土层的整体孔压消散进度,降低了固结速度,并且出现了类似曼德尔效应的现象,即在加载的初期,在远离排水面的地方,超孔压有所升高.同时,计算结果还表明,荷载大小也会影响到流变固结进程.%The modified linear relationship between the change of void ratio and the logarithmic time was introduced to simulate rheological behaviors in consolidation process of normally consolidated and saturated clays.Terzaghi' s one-dimensional consolidation equation was modified,and numerical analysis was performed by using the finite volume method.Then the effects of rheological parameters on one-dimensional consolidational behaviors of normally consolidated soils were investigated.The numerical results indicated that the rheological behaviors of these soils delayed the overall dissipation rate of excess pore water pressure and arrested the consolidation rate of these soil layers,and the phenomenon similar to the Mandel effect appeared,namely,the excess pore water pressure increased in the place far away from the drainage boundary at the beginning of loading.In addition,the loading value could also influence the consolidation behaviors of these soil layers.