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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极限反滤标准。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极限反滤标准为:当P<0.l小于30％时,D_(15)≤1.1mm,D_(15)/d_(35)~△≤15～17;当P<0.1 大于30％时,D_(15)=1.1mm,D_(15)/d_/((?)5)~△≤20。
In this paper, with the Pubugou project, the anti-seepage and seepage stability of wide-graded gravelly soils are systematically studied, and the limit inversion criteria for erosion resistance of wide-graded gravel soils is proposed. Research shows that when the fines content P<0.1 is greater than 25%, the wide graded gravel soil can meet the requirements of dam seepage; and it should be filled with wet optimal moisture content of 2% to 3%. The limit inversion criteria for guaranteeing seepage-proof erosion resistance of wide grade gravel soil from seepage is: when P<0.l is less than 30%, D_(15)≤1.1 mm, D_(15)/d_(35) ~△≤15～17; When P<0.1 is more than 30%, D_(15)=1.1mm, D_(15)/d_/((?)5)~△≤20.