含裂缝砾石土的反滤准则

Gravelly clayey soil is common used seepage resistant material in high embankment dams. The core of the high embankment dam may crack owing to the construction placement or arch effect of the core. however, the filter design criterion for cracked gravelly clayey soil is lack. In this paper, the filter tests are conducted using cracked gravelly clayey soils with different gravel content and filters with diferent grading and dry densities. Existing filter criteria for gravelly clayey soil are summarized and compared with the test results. The comparing results show that the existing filter criteria can not fully satisfy the need of filter design for cracked gravelly clayey soil. Based on the results of the tests and comparing analysis, the filter criterion for cracked gravelly clayey soils is proposed considering the combination seepage resistant mechanism of cracked gravelly clayey soil and the filter. The verification using the filter test results shows that the proposed filter criterion can used for filter design of cracked gravelly clayey soils with diferent gravel content.