8--酸碱污染土压缩特性的室内试验研究_朱春鹏.pdf

第 30 卷 第 10 期 岩 土 工 程 学 报 Vol.30 No.10 2008 年 ….10 月 Chinese Journal of Geotechnical Engineering Oct., 2008 酸碱污染土压缩特性的室内试验研究 朱春鹏，刘汉龙，张晓璐 (河海大学岩土工程水利部重点实验室，岩土工程科学研究所，江苏 南京 210098) 摘 要：随着我国工业化进程加速，工业企业对地基土污染问题已成为较为严重的环境岩土工程问题。酸碱污染使地 基土改性。为此，通过人工方法制备了 4 种不同浓度的酸、碱污染土，对不同浓度酸碱污染土的压缩变形性质研究。 试验结果表明，随着污染浓度的增加酸碱污染土的压缩系数增大，回弹指数也增大，而前期固结压力是减小的。碱污 染土的压缩系数变化比酸污染土大。并对影响酸碱污染土压缩性的各种因素进行分析研究，包括土污染前后的粒度分 析、塑性指数、含水率分析以及孔隙比。同时，研究了土在污染前后压缩性质变化对地基土的勘察评价造成的影响。 关键词：压缩试验；压缩曲线；回弹指数；压缩系数；前期固结压力 中图分类号：TU441 文献标识码：A 文章编号：1000–4548(2008)10–1477–07 作者简介：朱春鹏(1979– )，男，江苏扬州人，博士研究生，主要从事环境岩土工程方面的研究。E-mail: zcpeng@163.com。 Laboratory tests on compression characteristics of soil polluted by acid and alkali ZHU Chun-peng，LIU Han-long，ZHANG Xiao-lu (Key Laboratory for Geotechnical Engineering of the Ministry of Water Resources, Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China) Abstract: With the process of accelerative industrialization in China, the polluted foundation soil by industrial organizations had become serious environmental geotechnical problems. The properties of foundation soil have been changed by acid and alkali pollution. Soil specimens polluted by acid and alkali of 4 different concentration were artificially prepared. The compressible and deformable properties of polluted soil were studied. It was concluded that the rebound index, coefficient of compressibility and pre-consolidation pressure of polluted soil increased with the increase of the concentration, and the variation of the compression coefficient of soil polluted by acid was greater than that by alkali.