固化污泥固结渗透特性及孔隙变化试验研究

发布时间：2018-03-17 05:01

本文选题：污泥　切入点：固化　出处：《东南大学学报(自然科学版)》2016年S1期 　论文类型：期刊论文

【摘要】：为了研究固化污泥在大变形固结过程中的渗透性特点,选用普通硅酸盐水泥(OPC)和硫铝酸盐水泥(SAC)作为固化材料,开展了14 d龄期重塑样和原状样的固结渗透试验,得到了固化污泥在不同应力条件下的压缩、渗透规律;通过不同固结压力下的离心试验,分析不同固结应力下固化污泥的孔隙组成.试验结果表明,20%添加量内,固化污泥压缩系数均在1 MPa-1以上,属于高压缩性土;固结应力在0~800 k Pa范围内时,固化污泥压缩系数随固结应力降低了两个数量级;固化污泥压缩、渗流过程存在明显非线性,在考虑渗透系数时,不适宜将渗透系数作为常数考虑;固化污泥固结过程中,大孔隙和中孔隙减少,而小孔隙反而增加,占总孔隙的50%以上.
[Abstract]:In order to study the permeability of solidified sludge in the process of large deformation and consolidation, the consolidation and osmotic tests of 14 d remolded and undisturbed samples were carried out by using ordinary Portland cement (PC) and sulphoaluminate cement (SAC) as curing materials. The compressing and osmotic characteristics of solidified sludge under different stress conditions were obtained, and the pore composition of solidified sludge under different consolidation pressures was analyzed by centrifugal test under different consolidation pressures. When the consolidation stress is in the range of 0 ~ 800kPa, the compression coefficient of solidified sludge decreases by two orders of magnitude with the consolidation stress, the compressibility of solidified sludge is obviously nonlinear when the consolidation stress is in the range of 0 ~ 800kPa, and the compression coefficient of solidified sludge is above 1 MPa-1. When the permeability coefficient is considered, it is not suitable to consider the permeability coefficient as a constant. During the consolidation process of solidified sludge, the macropores and meso-pores decrease, while the small pores increase, accounting for more than 50% of the total pores.
【作者单位】：河海大学岩土工程研究所;河海大学环境学院;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2012CB719804) 国家科技重大专项资助项目(2012ZX07103005,2013ZX07113001) 科技基础设施建设计划资助项目(BM2013013) 中央高校基本科研业务费专项资助项目(2015B35614) 江苏省普通高校研究生科研创新计划资助项目(KYZZ_0142)
【分类号】：X703

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