珠三角软土在真空预压联合电动加固下微观结构变化研究

Study on Microscopic Characters of Soft Soil in the Pearl River Delta Vacuum Preloading and Electro-Kinetics Experiment

以真空预压联合电渗和真空预压联合电动作用后的珠三角海(河)积软土为研究对象,利用扫描电镜对以上两种粘土的微结构基本单元的孔隙数和孔隙率、基本单元的平均等效孔径和平均孔隙面积、基本单元的丰度和面积概率分布指数、基本单元的概率熵和孔隙等方面进行研究。在此基础上,将真空预压联合电渗和真空预压联合电动试验的结果进行对比。试验结果表明,相对于真空预压联合电渗试验,粘土经过真空预压联合电动试验后,土颗粒发生明显的破坏,小孔隙逐渐被挤压消失或孔隙之间自调整而互相连通形成大孔隙,软土也由蜂窝状-空架状结构逐步转变为骨架结构-团聚絮凝结构,真空预压联合电动的加固效果更加明显。为珠江三角洲地区海相沉积土区的工程建设提供了参考。

In this paper, vacuum preloading and electro-kinetics（electro-osmosis） role of the Pearl River Delta sea（Riv er） of soft soil as the object of study. We conduct studies using scanning electron microscopy on the mierostrueture of the above two kinds of clay in the basic unit of the pore number and porosity, the basic unit of the average equivalent pore size and aver- age pore size, the basic unit of the abundance and size distribution index, the basic unit of probability entropy and pore aspects. On this basis, compared the results of vacuum preloading and electro-kinetics（electro-osmosis） experiments. Experimental re- suits show that, compared with the vacuum preloading and electro-osmosis test, clay after electro-kinetics trials, obvious dam- age of soil particles. The small pores gradually squeezed disappear or the pores of self adjustment and communicated with each other to form large pores. Soft soil by cellular space frame structure gradually into the skeleton structure agglomerate fioccula- tion structure, vacuum preloading and electro-kinetics of the more obvious reinforcement effect. Provide a reference for the con- struction of marine deposit area of Pearl River Delta region.