摘要
为了探究垃圾填埋场中的土工布在垃圾渗滤液浸泡环境下的拉伸性能及筋-土界面剪切特性随时间的变化规律,开展了土工布室内拉伸试验和土工布与级配碎石的界面直剪试验研究。研究结果表明:垃圾渗滤液的浸泡作用对土工布极限抗拉强度的影响可忽略不计,土工布断裂伸长率出现一定程度的增加,2种土工布在浸泡12个月后断裂伸长率分别增加了4.58%和17.60%。土工布经渗滤液浸泡后其割线模量有所下降,且这种下降作用主要影响范围为土工布前期伸长应变下(应变约小于4%~5%时)的割线模量;垃圾渗滤液浸泡作用对筋-土界面抗剪强度没有产生明显影响,筋-土界面摩擦角和表观凝聚力基本保持不变。研究结论可对土工布加筋挡坝技术的发展和应用提供一定的指导。
Geotextile have been widely used in the reinforcement of waste landfill to enhance its stability.However,there is uncertainty for the effect of landfill leachate soaking on tensile properties of geotextile and the interface characteristics of geotextile-soil.In this paper,tensile test of geotextile and the direct shear test of geotextile-graded gravel were conducted for two types of geotextiles immersed in landfill leachate for 12 months to provide insight into the effect of leachate soaking on the behavior of the tensile properties of geotextile and the interface characteristics of geogrid-soil.The results can be concluded as follows:the erosion effect of landfill leachate on geogrid had a little effect on its ultimate tensile strength;the failure elongation of geotextiles increased 4.58%and 17.60%for the two geogrid;the secant modulus of geogrid decreased slightly,which mainly affected the secant modulus of geotextiles under lower elongation strain(strain less than 4%-5%);and the soaking effect of landfill leachate did not have an significant effect on the shear strength,friction angle and apparent cohesion of the reinforced soil.The findings of this study can provide guidance for application and development of reinforced waste landfill projects.
作者
郑超
周卫东
刘志达
ZHENG Chao;ZHOU Weidong;LIU Zhida(Guangzhou Grantop Environment Service Co.,Ltd,Guangzhou 510540,China;School of Civil and Transportation,South China University of Technology,Guangzhou 510640,China)
出处
《人民长江》
北大核心
2020年第8期203-208,共6页
Yangtze River
关键词
土工布
拉伸性能
级配碎石
筋土界面特性
垃圾渗滤液
垃圾填埋场
landfill leachate
geotextile
graded macadam
tensile property
geotextile-soil interface characteristics
