Study on permeability characteristics of organic soil
In order to study the permeability characteristics of organic soil,six mineral soil samples with different organic matter contents were prepared by adding peat to montmorillonite,illite and kaolin.The effects of consolidation pressure,void ratio,dry density,organic matter content and mineral composition on the permeability characteristics of organic soil were analyzed by using the results of the consolidation-permeability combined experiment.The experimental results show that with the increase of consolidation pressure,dry density,organic matter content and the decrease of void ratio,the overall permeability coefficient shows a decreasing trend.The relationship can be divided into two stages:A significant decline stage and a gentle decline stage.During the significant decline stage,the variation amplitude of permeability coefficient with consolidation pressure can reach 37%to 78%.For 1%increase in dry density and organic matter content,and for 1%decrease in void ratio,permeability coefficient decreases by 1%to 4%,2%to 6%,and 1%to 11%,respectively.During the gentle decline stage,the variation range of permeability coefficient with consolidation pressure is between 8%and 11%.For 1%increase in dry density and organic matter content,and for 1%decrease in void ratio,permeability coefficient decreases by 0.2%to 0.8%,0.5%to 0.6%,and 0.9%to 1.8%,respectively.The mineral composition has a significant impact on the permeability characteristics of soil.The permeability coefficients of the three types of mineral soils vary from large to small:Illite＞kaolin＞montmorillonite.
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NSTL
万方数据
