【摘要】 针对污泥固化土填埋处置中的压缩问题,开展了不同水泥添加量和不同初始孔隙比的污泥固化土的压缩试验,分析了污泥固化土的压缩特性.结果表明:水泥添加量为40%的污泥固化土,压缩指数也达到了0.58,属于典型的高压缩性土.水泥添加量在10%~30%的情况下,压缩指数减小的幅度较大,在水泥添加量大于30%时,压缩指数减小的幅度较小.随着初始孔隙比的增加,污泥固化土的压缩指数增大.污泥固化土中的有机物对其压缩性有重要影响,随着压缩的进行,污泥固化土的结构被破坏,并不断的进行调整、重组、压密、趋于封闭密实、胶结更紧密的方向发展;有机物引起的结合水膜逐渐变薄,有机物起到的连接作用逐渐加强;结合水膜由厚变薄,颗粒的蠕动阻力逐渐增加;这3个方面不断变化的协同耦合调整,以适应外力的变化,逐渐地抑制了污泥固化土的变形.更多还原

【Abstract】 To solve compression properties of solidified sludge( SS) in landfill disposal,a study was conducted on compression tests under different cement contents and different initial void ratios.The results show that the SS is high compression even if the cement contents are 40% with the compression index of 0. 58.The compression index is highly decreased with cement contents of10% ~ 30% and it is slowly down when the cement contents more than 30%. The compression index is increased with the increase of initial void ratio.Organics of SS have an important effect on its compressibility. With the compression process,the cement structure of SS is destroyed,adjusted,restructured,compacted which tends to be closed dense. Water of hydration gradually becomes thin caused by organics and the connection gradually becomes strong.Creep resistance of particles is increased with water of hydration from thick to thin.Coordinated adjustment adapts to external changes and gradually restrains the deformation of SS from these three aspects.更多还原