重金属污染对红黏土的粒度成分及抗剪性能影响研究

Study on the Particle Size Composition and Shear Resistance of Red Clay Affected by Heavy Metal Pollution

经济的发展伴随而来的环境污染问题,是可持续发展需解决的问题,重金属污染土壤的工程性质也是工程建设中的重要问题。为研究重金属污染红黏土的工程性能的变化,对掺入铅、汞、铬不同量的红黏土重塑土样进行颗粒级配和直剪试验。结果表明:随着重金属含量的增多,土壤的细颗粒重量将减少,除铬有先增加后降低的情况外;红黏土的粘聚力随重金属掺入量的增多而减小;掺入铅和汞土样的内摩擦角随掺入量增多而增大,掺入铬土样的内摩擦角随掺入量增多而减小。

The environmental pollution problem that accompanies economic development is a problem that needs to be solved for sustainable development,and the engineering properties of heavy metal contaminated soil are also important issues in engineering construction.To study the changes in the engineering performance of heavy metal contaminated red clay,particle grading and direct shear tests were conducted on remolded red clay samples mixed with different amounts of lead,mercury,and chromium.The results indicate that as the content of heavy metals increases,the weight of fine particles in the soil will decrease,except for the situation where chromium first increases and then decreases.The cohesion of red clay decreases with the increase of heavy metal addition.The internal friction angle of lead and mercury doped soil samples increases with the increase of doping amount,while the internal friction angle of chromium doped soil samples decreases with the increase of doping amount.