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为了定量研究粉质黏土的渗透系数随所受应力而变的特征,通过三轴渗透试验,测量不同干密度的粉质黏土在不同有效应力水平下的渗透系数,分析渗透系数与干密度和应力的关系。结果表明:粉质黏土的饱和密度随着应力的增大而增大,在应力为400 kPa时增幅为5%~9%;渗透系数k受有效应力σ的影响较大,在应力为300kPa时减小1~2个数量级;lnk与lnσ和干密度ρ线性相关显著。根据研究结果提出了考虑有效应力和干密度影响的粉质黏土渗透系数的表达式,并推导了粉质黏土层的纵向与横向等效渗透系数计算式及最具代表性土样的取样位置。
In order to quantitatively study the characteristics of permeability coefficient of silty clay with stress, the permeability coefficient of silty clay with different dry density at different effective stress levels was measured by triaxial permeation test. The relationship between permeability coefficient and dry density and stress relationship. The results show that the saturated density of silty clay increases with the increase of stress, and increases by 5% ~ 9% at 400 kPa. The permeability coefficient k is greatly affected by effective stress σ. When the stress is 300 kPa Reduce 1 ~ 2 orders of magnitude; lnk and lnσ and dry density ρ linear correlation was significant. According to the research results, the expression of permeability coefficient of silty clay considering the effect of effective stress and dry density is put forward, and the formula of vertical and horizontal equivalent permeability coefficient of silty clay layer and sampling position of the most representative soil sample are deduced.