药剂真空预压法处理工程废浆试验

武亚军; 陆逸天; 牛坤; 孙德安

doi:10.11779/CJGE201608002

药剂真空预压法处理工程废浆试验 English Version

上海大学土木工程系,上海 200072

基金项目: 国家教育部高等学校博士学科点专项科研基金项目（20123108120029）

详细信息

作者简介:
武亚军(1973- ),男,博士,副教授,主要从事岩土工程中软地基处理、基坑边坡支护、地下建筑结构工程等方面的教学与科研工作。E-mail: wyjdldz@163.com。

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出版历程
- 收稿日期: 2015-06-27
- 发布日期: 2016-08-24

Experimental study on solid-liquid separation of construction waste slurry by additive agent-combined vacuum preloading

Department of Civil Engineering, Shanghai University, Shanghai 200072, China

摘要

摘要: 将适合于处理大面积高含水率淤泥的真空预压法与用于污水处理的絮凝沉淀法相结合（即药剂真空预压法）应用于工程废浆的固液分离。针对上海某桩基施工现场产生的废弃泥浆采用4种不同的絮凝剂进行了沉降柱试验,并对各自的絮凝效果进行了对比。采用最佳絮凝效果时的絮凝剂和配比,进行了室内药剂真空预压模型试验,试验过程中对出水量和废浆浆面高度进行监测;试验前后进行了含水率、颗粒分布、压汞和扫描电镜试验。试验发现：①废浆含水率从絮凝前的163%,降低到絮凝后的96%,经过真空预压后再降低到37%;②加入絮凝剂后絮体中的黏粒含量减少、粉粒含量增多,即絮凝会使小颗粒长大;③处理后废浆的孔隙率明显下降,沿径向向内逐渐减小。研究表明药剂真空预压法技术可行、效果显著,值得大范围推广。
- 药剂真空预压 /
- 药剂 /
- 废弃泥浆 /
- 压汞试验 /
- 扫描电镜
Abstract: The vacuum preloading method dealing with soils with high moisture content in large area and the flocculation precipitation method used in sewage treatment are combined to achieve solid-liquid separation of construction waste slurry. A series of sedimentation column tests are performed on the waste slurry of a pile foundation project in Shanghai by using four different kinds of flocculants, and an optimum flocculant is obtained. Vacuum preloading model tests are carried out on the optimum flocculant and the slurry proportioning. During testing, the water yield and the height of slurry surface are monitored. Furthermore, the tests on moisture content, particle size distribution, mercury intrusion porosimetry and scanning electron microscopy are also carried out. It is found that: (1) After adding the flocculants, the moisture content of the waste slurry declines from 163% to 96%, and it is reduced to 37% by vacuum preloading. (2) After adding the flocculants, the clay content decreases, and the silt content increases. That is to say, flocculation will make small particles larger. (3) After the treatment, the porosity of waste slurry obviously decreases along the radial direction. The technology of solid-liquid separation by flocculants and vacuum preloading is feasible and effective, and is worthy to be used in engineering practice.
- additive agent-combined vacuum preloading /
- flocculant /
- waste slurry /
- mercury intrusion porosimetry /
- scanning

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