珠江三角洲软土微结构的扫描电镜研究

以扫描电镜为主要观察手段，研究珠江三角洲的全新世软土层受压前、后的微结构变化特征，并试图通过对一定厚度的样柱的压缩实验，探讨在给定荷载下软土微结构在垂深方向上的变化规律。对样桩施压后的观察结果表明，随着离施压点距离的增大（即向压力减小方向），软土的微结构的变化规律为：紊流状→基质状→骨架状（或凝块状）→蜂窝状（天然状态）。这一发现对于探讨应力在软土中的衰变规律、以及计算软土层在一定荷载下的压缩量等，可能是很有意义的。

Studies of Microstructures of Soft-soil from the Pearl River Delta by Means of SEM

This study tries to unravel the variations of the microstructure of soft-soil after compression by means of SEM. Soft-soil columns with certain lengths were collected from different places in the Pearl River Delta, and were pressed in lab. After that, observation over the microstructures of the soil was made with SEM. It was found that the microstructure of soil changes regularly in the vertical direction of the column. From the compression point downward (or with the reducing pressure), the microstructure of soil changes from turbulence-like to mass-like, then to frame-like and finally honeycomb-like. This findings should be significant for studying the disintegration of pressure in a soft-soil layer and for accounting the settlement of the soft-soil layer under a certain pressure.