iР (College of Water Conservancy and Civil Engineering , Xinjiang Agricultural University , Urumqi 830052 , China)РAbstract :Based on gradation characteristics of sand-gravel obtained from the material yard VII at Xinjiang“635”mulРtipurpose dam project , the feasibility of producing filter directly from this material yard is analyzed and experiments onРthree types of filters with different gradations have also been conducted under the most disadvantage working condition.РThe results show that , in spite of a great uneven coefficient , filters still can keep a favorable seepage stability and filРtering effect with high proportion of fine particles ; furthermore , on high seepage gradient , it can effectively protectРseepage-resistant soil.РKey words :earth-rockfill dam ; filter ; experiment
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