往复水流条件下土工织物反滤系统渗透稳定性模拟试验研究

Simulating test study on the seepage stability of the soil-geotextile filtration under cyclic flow

本文在循环往复水流条件下,分别对内部稳定土和内部非稳定土与较大孔径反滤网所组成的反滤系统的渗透稳定性进行试验分析。结果表明当滤网孔径与土颗粒特征粒径d85的比值在3～4之间时,反滤系统仍然能够保持渗透稳定性。增大循环往复水流的频率或振幅,将减小反滤系统的渗透稳定性。内部非稳定土比内部稳定土更易于受循环往复水流频率和振幅的影响。研究结果可为反滤设计准则中使用较大孔径的土工织物滤层以减少淤堵提供参考依据。

Tests and analyses of the seepage stability of the filtration systems made up of intemally stable soil and intemally unstable soil with filtration net under the cyclic flow are presented in this paper. Test results show that the seepage stability of the filtration system could still be maintained when the ratio of opening size of filtration net to characteristic grade size d85 of soil is between 3 and 4. Higher frequency and swing of the periodic flow led to higher instability of the filtration system. The seepage stability of the internally unstable soil is more sensitive to the cyclic flow than that of internally stable soil. The results provide references in using geotextile with bigger pore size to avoid clogging in filtration design.