应力影响下粉质黏土的等效渗透系数计算  

Calculation method of equivalent permeability coefficient of silty clay under stress

作　　者：曹彭强[1] 虞邦义[1] 余金煌[1] 马飞跃[1] 

机构地区：[1]安徽省.水利部淮河水利委员会水利科学研究院,安徽蚌埠233000

出　　处：《岩石力学与工程学报》2017年第A01期3656-3662,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：安徽省科技攻关计划项目(1501041139)~~

摘　　要：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 characteristic that the permeability coefficient of silty clay varies with the stress, the permeability coefficient of different dry density silty clay under different effective stress levels were measured by triaxial permeability test, and the relationship between permeability coefficient and dry density and stress were analysis. Results showed that the saturated density of silty clay increases with stress, and the increase amplitude were 5% - 9% when the stress was 400 kPa. The permeability coefficient k was great effected by effective stress a and decreased 1 to 2 orders of magnitudes when the stress was 300 kPa. The Ink presented a significant linear correlation with p and lncr. An expression for permeability coefficient of silty clay considering dry density and effective stress was proposed based on the results. And the equivalent vertical and horizontal permeability of silty clay layer calculation method and the most representative location of soil sample were derived.

关 键 词：土力学 粉质黏土 渗透性 三轴渗透试验 

分 类 号：TU43[建筑科学—岩土工程]