固化淤泥压缩特性的试验研究

›› 2012, Vol. 33 ›› Issue (10): 2923-2928.

固化淤泥压缩特性的试验研究

黄英豪^{1, 2}，朱伟^{1, 3}，周宣兆⁴，张春雷³

1. 河海大学水资源高效利用与工程安全国家工程研究中心，南京 210098；2. 南京水利科学研究院岩土所，南京 210024； 3. 河海大学环境工程学院，南京 210098；4. 河海大学岩土工程科学研究所，南京 210098

收稿日期:2010-07-27 出版日期:2012-10-10 发布日期:2012-10-19
作者简介:黄英豪，男，1979年生，博士，主要从事疏浚淤泥资源化利用的理论和技术方面的研究工作
基金资助:
国家自然科学基金项目(No. 50979028，No. 51209142)；江苏省自然科学基金项目(No. BK2012067)；国家973项目(No. 2012CB719804)；南京水利科学研究院青年基金(No. Y312003)

Experimental study of compressibility behavior of solidified dredged material

HUANG Ying-hao^{1, 2}, ZHU Wei^{1, 3}, ZHOU Xuan-zhao⁴, ZHANG Chun-lei³

1. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, China; 2. Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China; 3. College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China; 4. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

Received:2010-07-27 Online:2012-10-10 Published:2012-10-19

摘要/Abstract

摘要： 淤泥固化技术在国内已经进入到工程应用阶段，明确固化淤泥的压缩特性对于指导淤泥固化工程的设计具有重要意义。通过单因素试验方案对不同初始含水率、不同水泥添加量、不同养护龄期的固化淤泥的压缩特性进行了研究。结果发现，固化淤泥压缩特性的最大特点是存在固结屈服应力，当荷载小于固结屈服应力时固化淤泥的压缩性非常小，而固化淤泥屈服之后的压缩性是屈服前压缩性的20倍以上，并且远大于未处理淤泥的压缩特性。淤泥本身是高压缩性的土，固化处理以后变为中等压缩性和低压缩性的土体。固化淤泥的固结屈服应力随水泥量增加线性增大，龄期越长、含水率越低固结屈服应力越大。固化淤泥的这种在固结屈服应力处发生突变的压缩特性和天然沉积结构性土类似，可以用双对数压缩模式来表示固化淤泥的这种压缩特性。

关键词: 固化淤泥, 压缩特性, 压缩指数, 固结屈服应力

Abstract: Dredged material (DM) solidification technique was gradually put into engineering application in China, determination of the compressibility behavior cement-treated clays is of great importance to direct DM solidification engineering. Compressibility behaviour of cement solidified dredged material (SDM) was conducted through single factor experiment considering initial water content, cement content and curing time in the oedometer tests. Results show that the significant characteristics for the SDM compressibility is there exist a yield stress, when external load is below the yield stress; the compressibility is very low, however, once the external load exceed the yield stress, the compressibility of the SDM suddenly increases to more than 20 times at the post-yield state than that pre-yield state, and is also larger than that of the untreated dredged material. The untreated dredged material is belong to high compressibility soil according to criterion, and the cement treated dredged material transfers to medium or low compressibility soil. Yield stresses of SDM increase linearly with increased cement content; lower water content and longer curing time get larger yield stresses. The compressibility behaviour of SDM is similar to that of the natural sedimentary soils, double logarithm compression pattern is fitted to depict the sudden drop compressibility behaviour of SDM.

Key words: solidified dredged material, compressibility behaviour, compression index, consolidation yield stress

中图分类号:

TU 411.5

黄英豪，朱伟，周宣兆，张春雷 . 固化淤泥压缩特性的试验研究[J]. , 2012, 33(10): 2923-2928.

HUANG Ying-hao , ZHU Wei , ZHOU Xuan-zhao , ZHANG Chun-lei . Experimental study of compressibility behavior of solidified dredged material[J]. , 2012, 33(10): 2923-2928.

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