荷载作用下软土压缩模量与孔隙结构关系研究

Research on relationship between compression modulus of soft soil under loading and its pore structure

以深圳软土为研究对象,通过压汞试验获取了软土孔隙结构的特征参数,研究了在荷载作用下软土压缩模量与孔隙体积含量、孔隙尺度大小、孔隙连通量等软土结构特征的关系;探讨了在荷载作用下软土压缩模量随土体孔隙结构变化的机理。研究表明:(1)在荷载作用下软土压缩模量随其孔隙体积、平均孔径大小及孔隙连通量均呈双曲线形的负幂函数变化;(2)荷载作用下软土压缩模量随孔隙结构的变化过程可分为两个阶段。

Taking Shenzhen soft soil as research object,the pore structure characteristic parameters were obtained by mercury intrusion porosimetry,and the relationship between compression modulus of soft soil under loading and the pore structure characteristics such as pore volume,pore size and pore connectivity was studied,then the mechanism of compression modulus changing with pore structure of soft soil under loading was discussed.The research shows that a negative power function relation exists between compression modulus of soft soil under loading and the pore structure characteristic parameters including total pore volume content,average pore size and pore connectivity value.And the change process of compression modulus of soft soil under loading with the pore structure might be divided the two stages.