真空预压-电动条件下珠三角地区软土力学性质变化过程研究

软土具高含水量、高压缩性、高蠕变性、低渗透性、低强度等特点。近年来有学者提出真空预压-电渗法对软基进行处理,并在工程实践中得到了运用。真空预压-电渗法只能排出软土中部分弱结合水,工后沉降仍然较大,难于满足工程要求。针对该问题,有学者在真空预压-电渗的基础上加入少量盐溶液,即真空预压-电动法对软基进行处理,取得了较好的实验效果。该文以珠江三角洲地区软土为研究对象,通过真空预压-电渗法与真空预压-电动法(加入Cacl2溶液)的对比试验,验证了真空预压-电动法在软基处理中的优越性,为该方法的应用提供一定的科学依据。

A Study of the Mechanical Properties Changing Process of Soft Soil in the Pearl River Delta Region under the Vacuum Preloading-electrokinetics Condition

The soft soil contain high water content, high compressibility, high creep, low permeability and low strength. Recently, some researches have dealt with soft foundation using vacuum preloading-electroosmosis method which can only discharge partial weakly bound water in soft soil, but the amount of post construction settlement is still too much to meet the requirements of engineering. To solve this problem, a small amount of salt solution was added on the basis of vacuum preloading-electroosmosis method, known as vacuum preloading-electrokinetics method, and achieved a better experiment result. The soft soil in the pearl river delta region was studied. The comparative test was used between vacuum preloading-electroosmosis method and vacuum preloading electrokinetics method（adding Cacl₂ solution） in soft ground treatment, and it came to a conclusion that vacuum preloading electrokinetics method is at an advantage when dealing with soft soil, which provided a scientific basis for applications of vacuum preloading electrokinetics method.