土体污染对水泥土力学性质的影响

为了研究污染对土体性质和水泥土力学特性的影响，采用室内模拟试验，探讨了自然土在遭受不同污染源污染土体性质的变化，对比分析了由自然土和污染土配制成的水泥土在不同龄期的外观特征、无侧限抗压强度，得到土的塑性指数随污染源和含量的变化规律，及各种条件下水泥土试块表观变化现象、破裂形态和无侧限抗压强度曲线．试验结果和分析表明，污染物的种类和含量对土的塑性指数和水泥土强度有重要影响，硫酸污染土配制的水泥污染土抗压强度发生了变化，特别是在高含量条件下，强度折减显著，统计得出水泥土抗压强度与水泥污染土抗压强度间的环境影响系数，对污染土条件下进行水泥土应用提供了一定的拳孝依据．

Effect of Polluted Soil on Mechanical Property of Cemented Soil

In order to study the effects of various contaminant sources, such as H2SO4, NaOH, NaCl, on the characters of the soil and the properties of the cemented soil blocks, a series of laboratory tests were conducted to discuss the plasticity index change of polluted soil in comparison with natural soil, and to analyze the appearance characters and unconfined compressive strength of cemented natural soil blocks and cemented polluted soil blocks in various curing periods. The test results show that the plasticity indexes of soil are varied with the sorts of contaminant sources and its contents. The appearance variations, compressive failure features and unconfined compressive strength curves of cemented soil blocks were also analyzed under the various conditions. It is found that the plasticity indexes of soil and unconfined compressive strength of cemented soil are closely related with the sorts of contaminant sources and its contents. The sulfuric acid contaminant causes the change in the strength of cemented soil, especially, the strength at high content is reduced obviously. A parameter, termed as environmental effect coefficient, is statistically obtained to indicate the cemented soil strength relation between natural soil and polluted soil, which may be referenced in the application of cemented soil technique on polluted soil site.