分层真空预压软土地基一维大变形固结模型及试验研究

Modeling and experimental study of one-dimensional large strain consolidation of soft soil under multi-layer vacuum preloading

基于以有效应力为控制变量的一维大变形固结方程,考虑固结过程中孔隙比及渗透系数随时间的变化,建立了分层真空预压多层软土地基的一维大变形固结分析模型,并利用差分法进行了数值求解.分析表明,分层真空预压软土地基能够大幅提高软土地基的固结速率,软土的初始孔隙比及初始渗透系数对分层真空预压软土地基的固结速率有较大的影响.与模型试验结果的对比表明,该模型较合理地反映了分层真空预压下土体的变形和固结性状.

Based on the one-dimensional large strain consolidation equation with effective stress as control variable,taking into account the variation of void ratio and permeability during the consolidation,a one-dimensional large strain consolidation model of soft soil ground under multi-layer vacuum preloading was presented.Analysis shows that the multi-layer vacuum preloading can greatly improve the consolidating velocity of the soft soil,and the initial void ratio and permeability obviously influence the consolid...