摘要
本文结合瀑布沟工程，系统地研究了宽级配砾石土的防渗性和渗透稳定性，提出了宽级配砾石土抗冲蚀破坏的根限反滤标准。研究表明，当细料含量Ｐ＜０．１大于２５％时，宽级配砾石土可以满足大坝防渗要求；且宜按湿于最优含水量２％－３％填筑，保证宽级配砾石土防渗体免遭渗流冲蚀破坏的根限反滤标准为：当Ｐ＜０．１小于３０％时，Ｄ１４≤１５－１７；当Ｐ＜０．１大于３０％时，Ｄ１５＝１．１ｍｍ，Ｄ１５ｄ８５＾△≤２０。
In connection with the construction of Pubugou Project, anti-seepage behavior and piping resistance of gravelly soil with broad gradation were studied systematically and the criteria of critical filter for resisting erosion failure of gravelly soil were proposed. Results showed that gravelly soil will fulfill impermeability requirement when P_<0.1 of fine particle content >25% and the effect of impermeability will be more remarkable when filled with 2%~3% on the wet side of optimum water content; the criteria of critical filter for preventing core material from erosion failure are D15≤1.1mm, D_15/d_85~4≤15~17 when P_<0.1<30%,andD_15≤1.1mm, D_15/d_85~4≤20 when P_0.1>30%.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
1993年第6期18-27,共10页
Chinese Journal of Geotechnical Engineering
关键词
砾石土
宽级配
反滤层
防渗性
gravelly soil, broad gradation, permeability erosion resistance, filters.
