河道淤泥气泡混合土微观构造及力学性质相关性

摘要

Based on the characteristics of microstructure of foamed mixture lightweight soil using river sludge (FMLSS),the strength properties and failure mechanism of FMLSS are studied.The results show that when water content of FMLSS is constant,with the increase of bubble incorporation internal average equivalent aperture,the percentage of porosity area of FMLSS present linear increasing trend,while all of them decrease with the increase of cement incorporation.With the increase of bubble incorporation,the size uniformity of pore in FMLSS reduces,while improve with the increase of cement incorporation.The strength of FMLSS has obvious correlations with the microscopic parameters of FMLSS such as the equivalent aperture and uniformity of pore distribution.The results provided basis for the study of the strength of FMLSS and the mechanism of the damage.%基于河道淤泥气泡混合土（FMLSS）的微观构造特征，通过微观构造观察和分析，评价了FMLSS 的强度特性和破坏机理。试验结果表明，保持 FMLSS 含水量一定，随着气泡掺入量的增加，FMLSS 的内部平均等效孔径和气孔面积百分比含量呈线性增大趋势、而随着水泥掺入量的增加呈减小趋势；随着气泡掺入量的增加，FMLSS 的气孔大小分布的均匀性降低，气孔平均等效孔径增大。试验结果还表明，FMLSS 的强度发挥及破坏机理与 FMLSS 的气孔分布的均匀性以及等效孔径等微观构造参数存在明显的相关性。