生石灰与粉煤灰桩加固软土地基的微观分析

采用压汞试验和扫描的电镜的手段，分析了生石灰与粉煤灰桩加固软土地基前后土的微观结构和孔隙特征的变化，发现加固后特大孔隙和大孔隙减少，小孔隙和微孔隙增加，不同的土质存在着不同的孔隙阈界值，且孔隙阈界值在加固后明显降低，对加固前后不同土的微观结构进行分类，从微观上解释了生石灰与粉煤灰桩加固软土的机理。

Microstudy on soft foundations reinforcement with lime-fly ash piles

 Presented in this paper are studies of the changes of microscopic characteristics and those of pore size distribution features before and after lime-fly ash reinforcement of the soft ground. The research methods include mercury intrusion porosimetry (MIP) test and scanning electron microscope (SEM) technique. The autors find that the extra large pores and large pores have decreased in number and small pores and micro-pores increased after lime-fly ash reinforcement. In addition,there exist different values of pore threshold for different soil deposits and the values of pore threshold radii decrease significantly after lime-fly ash reinforcement. Finally,the classified microscopic structures of different soils before and after lime reinforcement could interpret the reinforcement mechanism satisfactorily.