摘要
根据非织造土工布的结构特点、隧道工程的环境条件,基于非织造土工布水平方向的多孔介质模型与水平排水试验,对非织造土工布在水平方向上的排水特性进行了分析和探讨。模型分析表明,其2个重要影响参数等效孔径r、孔隙数目N会受非织造布的规格、外界法向压力等因素的影响发生变化;水平排水试验结果也表明,虽然单位面积质量高的无纺布等效过水面积大,但由于其等效孔径小且孔隙数量多,造成过水截面中的孔隙总周长大,使其水平排水能力降低。
The level drainage property of nonwoven geotextiles was analyzed and discussed based on porous medium model of level direction and level drainage experiments according to the microstructure features of nonwoven geotextiles and environmental conditions of tunnel engineering. The analyses to the porous medium model shows that two important parameters (equivalent aperturerr and number of pores N) of the model will adjust to suit the change of plane unit mass of nonwoven geotextiles and normal pressure on it. The level drainage experiments also show that although the nonwoven geotextiles with high plane unit mass has bigger equivalent flow area,its level drainage capability is lower because its equivalent circumference is longer according to the smaller equivalent aperture and more numbers of pores of the level flow section.
出处
《新型建筑材料》
2013年第1期57-61,共5页
New Building Materials
基金
国家自然科学基金青年科学基金项目(51108385)
中央高校基本科研业务费专项资金资助(SWJTU11ZT33)
关键词
非织造土工布
水平排水性能
多孔介质模型
隧道工程
nonwoven geotextiles
level drainage property
porous medium model
tunnel engineering
作者简介
作者简介:蒋雅君,男,1980年生,广西桂林人,博士,副教授,主要研究方向为隧道与地下工程防排水技术、既有隧道病害检测及处治、地下工程防灾减灾等。地址:四川成都二环路北一段111号西南交通大学土木学院地下工程系,E—mail:yajunjiang@126.com。