Drainage performance and capillary rise restraint effect of wicking geotextile  

毛细导水土工布排水性能及其抑制毛细水上升效果研究

作　　者：BAI Mei LIU Zhi-bin ZHANG Shu-jian LIU Feng LEI Song-lin 白梅;刘志彬;张书建;刘锋;雷松林(Department of Underground Engineering,School of Transportation,Southeast University,Nanjing 211189,China;Jilin Provincial High-Class Highway Construction Bureau,Changchun 130028,China)

机构地区：[1]Department of Underground Engineering,School of Transportation,Southeast University,Nanjing 211189,China [2]Jilin Provincial High-Class Highway Construction Bureau,Changchun 130028,China

出　　处：《Journal of Central South University》2021年第10期3260-3267,共8页中南大学学报（英文版）

基　　金：Projects(41872240,41672280)supported by the National Natural Science Foundation of China;Project(2016-1-16-2)supported by Science and Technology Project of Jilin Province Transportation,China;Project(SJCX18-0052)supported by the Postgraduate Research&Practice Innovation Program of Jiangsu Province,China。

摘　　要：Wicking geotextile(WG)is considered as a possible countermeasure to reduce water content in unsaturated soil.In this research,rainfall tests were carried out to verify the drainage performance of WG.And capillary rise tests were conducted to study the effect of WG on the prevention of capillary rise.Test results indicated that WG with good drainage performance could drain gravitational and capillary water out of kaolinite soil.For kaolinite soil column with water content of 12%and compaction degree of 90%,the whole process of capillary rise in soil column with a layer of WG was a typical two-stage mode,and the maximum capillary height was about 380 mm,which provided that the WG could work as a barrier to prevent capillary rise effectively.In addition,the total vertical influential regions of WG in kaolinite soil above and below the WG layer were 400 and 100 mm,respectively.毛细导水土工布是一种可在非饱和土中发挥排水作用的新型土工合成材料。本文通过模拟降雨试验与毛细水上升试验分别研究了毛细导水土工布的排水性能和抑制毛细水上升的效果。试验结果表明:毛细导水土工布能排出非饱和高岭土中的重力水和毛细水;在含水率12%、压实度90%且铺设毛细导水土工布的高岭土土柱中,毛细水的上升过程是典型的两阶段模式且最大毛细水上升高度为380 mm,即毛细导水土工布有效抑制了毛细水上升。此外,在非饱和高岭土中,毛细导水土工布的有效影响范围分别为其上侧400 mm、下侧100 mm。

关 键 词：GEOSYNTHETICS wicking geotextile fine-grained soil drainage performance capillary rise soil column test 

分 类 号：U416.1[交通运输工程—道路与铁道工程]