铅污染土壤的淋溶后对土体稳定性的影响研究

Study on the Influence of Lead-Contaminated Soil on Soil Stability after Leaching

摘要: 为探究铅污染土壤淋溶后对土体稳定性的影响，本文采用室内淋溶试验，设置不同容重不同粒径下铅污染土壤淋溶试验。结果表明，当竖向荷载力P = 800 kPa时，A处理(ρ = 1.0 kg/cm³)相比D处理(ρ = 1.4 kg/cm³)压缩变形量增加2.9%~13.9%，且粒径越大变形量越大。抗剪强度随容重增大而增强，竖向应力达到400 kPa时，D处理(ρ = 1.4 kg/cm³)相比A处理(ρ = 1.0 kg/cm³)抗剪强度增加11.4%~18.6%，内摩擦角值增加1.73˚~3.14˚。但土壤的黏聚力大小与粒径相关，粒径越小，黏聚力越大，D1相比D3的黏聚力增加了10.91 kPa。因此，容重较大、土壤粒径较小的土壤进行重金属铅淋溶后土体较为稳定。

Abstract: To explore the influence of lead-contaminated soil on soil stability after leaching, in this paper, an indoor leaching test is used to set up a lead-contaminated soil leaching test with different bulk densities and different particle sizes. The results show that when the vertical load P = 800 kPa, the compression deformation of treatment A (ρ = 1.0 kg/cm³) increases by 2.9% to 13.9% compared with treatment D (ρ = 1.4 kg/cm³), and the larger the particle size is, the greater the amount of deformation is. The shear strength increases with the increase in bulk density. When the vertical stress reaches 400 kPa, the shear strength of treatment D (ρ = 1.4 kg/cm³) increases by 11.4%~18.6% compared with treatment A (ρ = 1.0 kg/cm³). The value of the internal friction angle increased by 1.73˚~3.14˚. However, the cohesion of the soil is related to the particle size. The smaller the particle size is, the greater the cohesion is. Compared with D3, the cohesion of D1 increases by 10.91 kPa. Therefore, soil with larger bulk density and smaller soil particle size is more stable after heavy metal lead leaching.