砾石土防渗料-反滤料联合抗渗试验  

Combination Seepage Failure Test of Gravelly Soil and the Filter

作　　者：陈群[1] 谷宏海[1] 何昌荣[1] 

机构地区：[1]四川大学水利水电学院水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《四川大学学报（工程科学版）》2012年第1期13-18,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学青年基金资助项目(50709022);2007年新世纪优秀人才支持计划(NCET-07-0569);国际(地区)合作与交流项目(51010105009)

摘　　要：防渗料在高水头作用下是否发生渗透破坏,在很大程度上取决于设置在其后的反滤料对防渗料的保护效果。利用自行改造的竖向渗透破坏仪,在大量砾石土防渗料和反滤料的竖向联合渗透破坏试验的基础上,研究了防渗料砾石含量、干密度及反滤料的级配、干密度和厚度对防渗料与反滤料联合抗渗性能的影响规律,分析了试验过程中初始临界坡降的出现机理和自滤反滤层的形成过程。研究表明,试样的初始临界坡降随防渗料和反滤料干密度的增大而增大,随防渗料砾石含量、反滤料控制粒径D15的增大而减小,随反滤料厚度的增加而增大。Whether the seepage failure will occur in gravelly soil under high water head to a great extent depends on the protection effect of the filter on the gravelly soil.Based on many combination seepage failure tests of the gravelly soil and the filter using self-rebuilded vertical permeameter,the influence of the gravel content and dry density of gravelly soil,the grading,dry density and thickness of filter on the seepage failure resistance was studied.Occurring mechanism of the initial critical hydraulic gradient and the formation process of self-filter layer were analyzed.The results showed that the initial critical hydraulic gradient increases with the increase of the dry density of e gravelly soil and filter.It decreases with the increase of the gravel content of gravelly soil and the control particle size D15 of filter.In addition,the initial critical hydraulic gradient increases with the increase of the thickness of the filter.

关 键 词：砾石土 防渗料 反滤料 抗渗性能 

分 类 号：TU443[建筑科学—岩土工程]