酸碱污染土压缩特性的室内试验研究

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。

Laboratory tests on compression characteristics of soil polluted by acid and alkali

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.All kinds of factors influencing the compressibility of polluted soil were analyzed,including grain-size distribution,plasticity index,moisture content and void ratio.The influence of variation of the compressibility of soil before and after pollution on the evaluation of the polluted foundation soil was studied.