The change of seepage field was investigated under the conditions of drainage system in the downstream of earth-rock fill dam with high pervious foundation based on the actual project condition.The analytic method of saturated-unsaturated seepage was used to study the distributed character of seepage field.The results show that the joint action of collection gallery and radiation well can reduce effectively the phreatic line in the dam and be easily to drain seeping water.However,it causes the increase of h...
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