Experimental research on geotechnical behaviors of compacted clay influenced by metal cation

摘要

Considering orthogonal experiment method as design technique method, on the basis of leachate water quality analysis, the author discovers the influence of main kind cation in leachate from MSW landfill on compacted clay geotechnical behaviors, including permeability, strength and plasticity. The researches are as follows: by changing the thickness of diffusion electric double layer and the adsorbability of polar water molecular, density and valence state of metal cation, make soil particles agglomerate or disperse, and result in varying clay plasticity, intensity and permeability. Clay plasticity index increases with low valence state content growing and reduces with high valence state content rising; Permeability coefficient becomes larger with cation valence state increasing in the same cation concentration solutions; whereas, clay shear strength decreases with low valence state content growing, and increases with high valence state ion content rising.