单向拉伸对土工织物反滤性能影响的试验研究  

Influence of uniaxial tensile strain on filtration characteristics of geotextiles

作　　者：唐琳[1] 唐晓武[1] 佘巍 高柏松[3] 

机构地区：[1]浙江大学建筑工程学院滨海和城市岩土工程研究中心,浙江杭州310058 [2]武汉经济技术开发区规划土地局,湖北武汉430056 [3]中国中铁二院工程集团有限责任公司,四川成都610031

出　　处：《岩土工程学报》2013年第4期785-788,共4页Chinese Journal of Geotechnical Engineering

基　　金：成都铁二院合作项目(科2011-29);浙江省重大科技专项重点社会发展项目(2009C03008-1)

摘　　要：为研究单向拉伸对土工织物反滤性能的影响,选取两种条膜机织有纺织物和两种短纤针刺无纺织物,将不同拉应变下的织物与非连续级配土组成反滤系统,利用梯度比渗透仪测试系统反滤参数随拉应变的变化。根据反滤设计的透水、保土和防淤堵3个准则,分析拉应变对透水率、漏土量、梯度比等各参数的影响。试验结果表明:随着拉应变增加,有纺织物透水及防淤堵性能增强,保土性能减弱;无纺织物则相反,透水及防淤堵性能减弱,保土性能增强;同种土工织物厚度越大,拉应变对其反滤性能影响越大。Gradient ratio tests are carried out to study the influence of uniaxial tensile strain on the filtration characteristics of geotextiles. Four kinds of geotextiles （two needle-punched nonwoven and two slit-film woven） are employed in the tests. The filtration systems are composed of the geotextiles under designed uniaxial strains and gap-graded soils. The variations of the mean flow rate, the weight of soil passing through the geotextile and the gradient ratio with strains are analyzed based on the filtration criteria. The experimental results illustrate that the permeability and anti-clogging capabilities of woven geotextiles increase with the increase of the uniaxial tensile strain, but the retention capabilities decrease. The influence of tensile strain on nonwoven geotextiles is just the reverse. Moreover, the thicker the geotextiles are, the larger the influence of strain is.

关 键 词：土工织物 反滤性能 单向拉伸 梯度比 

分 类 号：TU47[建筑科学—结构工程]