论文部分内容阅读
基于上海地区浅层软粘性土较易被污染,且通常工业污染中以硫酸污染最为严重这一原因,选用该地区浅层典型的淤泥质粉质粘土,通过室内浸泡方法制备酸性污染土,系统研究了不同浓度硫酸溶液、不同侵蚀时间对土体物理力学性质的影响,研究表明:随酸侵蚀时间的推移,土的含水量、孔隙比、液塑限都是随硫酸浓度的增加而增加;土的圆锥入土深度随着浸泡时间的延长、酸液浓度的增加而加大,微型十字板强度减小,直剪固快试验结果规律不明显;压缩系数随浸泡时间的延长呈增大的趋势,压缩模量呈减小的趋势,而压缩系数和压缩模量随酸液浓度的变化规律不明显.同时对污染土几种强度试验方法的有效性进行对比分析,表明直剪固快试验有效性差;微型十字板试验和圆锥入土深度试验结果相吻合,有效性好,建议采用微型十字板和圆锥入土深度试验进行污染土室内强度试验.
Based on the reason that the shallow soft clay in Shanghai is more likely to be contaminated and the pollution caused by sulfuric acid is the most serious in industrial pollution, the typical silty silty clay in this area is selected to prepare acidic contaminated soil by indoor immersion method. The effects of different concentrations of sulfuric acid solution and different erosion time on the physical and mechanical properties of soil were studied. The results showed that with the increase of sulfuric acid concentration, the soil water content, porosity ratio and liquid - plastic limit increased with the increase of sulfuric acid concentration. The depth of cone penetration into soil increased with the increase of immersion time and concentration of acid solution, the strength of miniature cross-shaped plate decreased, and the law of direct shear fixation was not obvious. The compression coefficient increased with the extension of soaking time , The compressive modulus shows a decreasing tendency, while the compressibility coefficient and compressive modulus change with the concentration of acid solution is not obvious.At the same time, the effectiveness of several strength test methods of contaminated soil are compared and analyzed, which shows that the direct shear fast test is effective Poor; micro-cross plate test and conical soil depth test results are consistent, effective, it is recommended to use micro-cross plate and cone into the soil depth test of contaminated soil room Strength test.