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黏性土的界限含水率是用于土的分类和评价的重要指标,并可能与渗透系数等参数具有一定的相关性,但溶液作用下界限含水率的变化规律没有一致的结论。选取填埋场渗滤液中的几种代表性溶液,对0~15%含量的膨润土改性黏土的界限含水率及渗透性进行了试验。研究发现,CaCl2溶液和乙酸溶液具有絮凝作用,使高液限黏土变为高液限粉土;膨润土改性黏土的液限和塑性指数与膨润土掺入量正相关;改性黏土的液限随CaCl2溶液浓度的增大而减小;渗透系数与液限之间没有显著相关性,溶液作用下土的渗透性能还需要深入研究。
Boundary moisture content of cohesive soil is an important index for the classification and evaluation of soil, and may have some correlation with parameters such as permeability coefficient. However, the law of variation of boundary moisture content under the action of solution is not consistent. Several representative solutions of landfill leachate were selected to test the limiting moisture content and permeability of bentonite modified clay with 0 ~ 15% content. The results show that CaCl2 solution and acetic acid solution have the flocculation effect, which makes the high liquid limit clay become high liquid limit silt. The liquid limit and plasticity index of bentonite modified clay are positively correlated with the bentonite content. The liquid limit of the modified clay CaCl2 solution concentration decreases and decreases; there is no significant correlation between the permeability coefficient and the liquid limit, the permeability of the soil under the solution needs further study.