河道淤泥气泡混合土是由固体土体和微孔组成非均质复合材料,微孔结构形状及分布特征是影响气泡混合土力学性质的主要因素。基于河道淤泥气泡混合土内部微孔分布的细观特征,利用物理力学及数值模拟试验方法,对河道淤泥气泡混合土的力学性质与微孔细观特征的相关性进行分析,以揭示河道淤泥气泡混合土的强度发挥及破坏机理。根据模拟计算及试验实测得到:大孔径微孔及微孔孔径分布的均匀性是影响气泡混合土力学性质的重要因素;其次,河道淤泥气泡混合土中的气泡掺入量、水泥掺入量也是影响河道淤泥气泡混合土力学性质的主要因素。

Foamed mixture lightweight soil using river sludge (FMLSS) is an inhomogeneous composite material composed of solid soil and micropores. The structural shape and distribution of micropores are main factors influencing the mechanical properties of FMLSS. In this article, the correlation between FMLSS’s mechanical properties and micropore’s mesoscopic characteristic is studied to reveal the strength and failure mechanism of FMLSS by means of physical mechanical tests and numerical simulation. According to the simulation and test measurement, large diameter micropore and the uniformity of diameter distribution are important factors that affect FMLSS’s mechanical properties; secondly, the air foam content and cement content in FMLSS are also main factors that affect FMLSS’s mechanical properties.