珠江三角洲软土微结构的定量研究

Quantitative Study on the Microstructure of Soft Clay in Zhujiang Delta

对用不同长度的PVC管在珠海和广州两地采得的淤泥样柱施于一定荷载 ,然后在扫描电镜下研究软土受压后在样柱垂深方向上的微结构变化 ,并将样品的微结构照片扫描 ,在计算机内进行量化处理。结果表明 ,样品的孔隙分布分维差随着离施压点距离的增加而逐渐减小 ,从而得到了两者的关系方程。据此 ,可了解在一定荷载下应力在软土层中向下的衰减趋势。

The microstructure of soft soil column after loading obtained by PVC pipes of different length in Zhuhai and Guangzhou was observed by SEM and quantitatively processed by computer.The result indicated that the fractal dimension difference of void distribution decreases with the increase of distance between the sampled depth and the loading point and an empirical equation was established.The tendency of stress decrease with depth can be predicated by this equation.The influence of natural water content and surrounding pressure on soil compression was preliminarily discussed.