市政污泥固化土填埋处置中的压缩特性研究

发布时间：2019-03-08 17:02

【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.
[Abstract]:Aiming at the compression problem of sludge solidified soil in landfill disposal, the compression tests of sludge solidified soil with different cement content and different initial pore ratio were carried out, and the compression characteristics of the sludge solidified soil were analyzed. The results show that the compressive index of the sludge-solidified soil with 40% cement content is 0.58, which is a typical high-pressure shrinkage soil. When the addition of cement is 10% ~ 30%, the compression index decreases greatly, and when the cement content is more than 30%, the compression index decreases less. With the increase of initial porosity ratio, the compression index of sludge solidified soil increases. The organic matter in the sludge-solidified soil has an important influence on its compressibility. With the process of compression, the structure of the sludge-solidified soil is destroyed, and the structure of the sludge-solidified soil is continuously adjusted, reorganized, compacted, tends to be closed and compacted, and the direction of closer cementation is developed. The binding water film caused by organic matter gradually thinned, and the bonding effect of organic matter gradually strengthened, and the peristaltic resistance of the particles increased gradually when the bound water film became thinner from thick to thin. In order to adapt to the change of external force, the deformation of the soil solidified by sludge is gradually restrained by the continuous change of co-coupling adjustment in these three aspects.
【作者单位】：河海大学岩土工程科学研究所;河海大学地球科学与工程学院;
【基金】：国家自然科学基金项目(51278172) 江苏省自然科学基金项目(BK2012883)
【分类号】：X703

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