中文摘要：

通过电镜扫描试验与图像分析手段,对加载前、后不同土性及不同水泥掺量的加固黏性土微观结构进行研究,定量分析其微观孔径大小、孔隙形状系数以及孔隙定向角等参数变化的影响,并探索其与加固土体强度及承载机制的关系。研究结果表明：（1）水泥黏性加固土在加载前、后孔径分布和孔隙形状系数呈现出不同的规律,水泥掺量小（5%）的加固土加载后孔径减小,孔隙形状系数增大,宏观表现为剪缩;而水泥掺量高（20%）的加固土加载后整体孔径增大,孔隙形状系数减小,宏观表现为剪胀;（2）水泥黏性加固土体无论其水泥掺量的高低,在加载过程中,其颗粒或团粒均在内部应力作用下发生定向性的滑移或转动,从而导致孔隙长轴方向发生改变,孔隙定向角分布由均匀变为集中,孔隙定向性趋于显著。

英文摘要：

The micro structure of cemented soils,which is made from different original soils as well as with various cement contents,is investigated by ESEM method. Then,the data of pore such as the diameter,shape index and orientation angle are quantitatively analyzed via image processing technology. Comparing these data got from the loaded samples and unloaded ones,the connection between the strength of cemented soil and bearing mechanism is explored. The results show that the performance of pore diameter and pore shape is different before and after loading. Under the lowest cement content（5%）,shear contraction happens after loading,while pore diameter reducing and coefficient of pore shape increasing. However,shear dilation happens under the highest cement content（20%）,while pore diameter increasing and coefficient of pore shape reducing. During the loading process,under the interaction of internal stress,particles of cemented soils will directionally slide or rotate whether the cement content is lower or higher. Furthermore,pore axis direction of cemented soils is also changed,and orientation angle changed from uniform into concentration,and pore directional characteristic is obvious.