随着社会发展,工业废水排放导致地基土污染已经成为较为严重的环境岩土工程问题。为了研究黄土地基在酸碱污染后工程性质的变化情况,从水-土相互作用的角度出发,以盐酸和氢氧化钠溶液为污染物,人工制备5种不同酸碱度的溶液用于浸泡黄土,并通过基本土工试验及电阻率试验测试了重塑黄土工程性质指标变化情况。研究发现:随着孔隙溶液酸性增强,重塑黄土的液限、塑性指数、渗透系数、黏聚力和内摩擦角逐渐增大,电阻率逐渐减小;随着孔隙溶液碱性增强,土体中的黏粒含量增加,液限、塑性指数和电阻率逐渐降低,黏聚力、内摩擦角和渗透系数逐渐增大。研究孔隙溶液酸碱度对土体基本物理力学性质的影响,可为环境岩土工程实践提供借鉴。
Abstract
With the rapid development of society, foundation soil pollution caused by vast waste water discharge has arising as a severe geoenvironmental problem. The changes in engineering properties of remolded loess polluted by hydrochloric acid and sodium hydroxide solutions are investigated via geotechnical test and resistivity test. The solutions are prepared at five different pH values. Result demonstrates that with the increase of acidity of the solution, the liquid limit,plasticity index, permeability coefficient, cohesive force and internal frication angle gradually increased, while electrical resistivity decreased; with the increase of alkalinity of the solution, the clay content, cohesive force, internal friction angle, and permeability coefficient increased, while liquid limit, plasticity index and electrical resistivity gradually decreased. Researching the effect of pH value of pore solution on properties of loess would offer reference for geoenvironmental practice.
关键词
重塑黄土 /
环境岩土 /
酸碱污染 /
孔隙溶液酸碱度 /
工程性质
Key words
remolded loess /
geoenvironmental problem /
acid-base pollution /
pH value of pore solution /
engineering property
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基金
国家自然科学基金项目(51409217,51579215);杨凌示范区科技计划项目(2018NY-28);中央高校基本科研业务费科技创新项目(2014YB047);国家留学基金资助项目([2015]3069号)
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