Abstract

This study investigates the effect of porewater salinity on the compression behaviors of soft marine clay with multi-mineral compositions. A series of one-dimension compression tests were conducted with clays at different porewater salinity. The results indicate that the compression index decreases with increasing porewater salinity and can be described by a second-order polynomial equation, where the influence of porewater salinity is limited as the salinity increases to a threshold value. The normalized void indexes are taken from both ICL and EICL curves. It is believed that the compression behaviors of soft marine clay depend on the bentonite content. Hydraulic conductivity was back calculated based on empirical equations and is found to increase with increasing porewater salinity. Hydraulic conductivity is dominated by the inter-aggregated voids for soft marine clay at relatively high porewater salinity, and the influence of porewater salinity on the inter-aggregated voids of soil is limited at high salinity. A conceptual framework was presented to understand the changes in macroscopic soil behaviors with respect to the particles and pore fabrics of soil under the effect of porewater salinity.

摘要

本研究探讨了孔隙水盐度对具有多种矿物成分的软海相粘土的压缩行为的影响。对不同孔隙水盐度的粘土进行了一系列一维压缩试验。结果表明，压缩指数随着孔隙水盐度的增加而降低，并且可以用二阶多项式方程来描述，其中孔隙水盐度的影响随着盐度增加到阈值而受到限制。归一化空隙指数取自 ICL 和 EICL 曲线。认为软海相粘土的压缩行为取决于膨润土的含量。根据经验方程反算水力传导率，发现随着孔隙水盐度的增加而增加。在较高的孔隙水盐度下，水力传导率以软海相粘土的团聚空隙为主，在高盐度下，孔隙水盐度对土壤团聚空隙的影响有限。提出了一个概念框架，以了解在孔隙水盐度影响下土壤颗粒和孔隙结构的宏观土壤行为变化。