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一、前言鸭河口水库河槽段土壩长1,100米(从1+460～2+560),壩高为28～31米,壩基为8～14米的沙卵石层和沙层,未作垂直防渗设备,依靠长255米的粘土铺盖,阻滞渗透水流,合拢前只在1+820～2+320段作好壩脚导渗沟,土壩合拢后,发现渗水较大,同时于壩址下游因导水体上有土盖着,发现微小的湧泉,在7.5米的水头作用下实测壩基最大水力坡降为0.022,如按直线变化增长,当蓄水达最高水位后(水头为29.5米),水力坡降将会增大到0.0865,已接近依斯托明娜建议的允许坡降值0.1。59年5月底长办苏联专家斯匹林及柯兹洛夫
I. INTRODUCTION The earth dam with a length of 1,100 m (from 1 +460 to 2 +560) and a dam height of 28 to 31 m and a dam foundation of 8 to 14 m is not used for vertical seepage control Equipment, rely on 255 meters long clay cover, blocking the infiltration of water flow, before closing only in the 1 +820 ~ 2 +320 section of the dam foot guide seepage ditches, earth dam closed, found a larger seepage, at the same time dam downstream There is a soil cover on the water guiding body and a tiny spring is found. Under the action of a water head of 7.5 meters, the maximum hydraulic gradient of the dam foundation is measured as 0.022. When the water level reaches the highest level (the head is 29.5 meters) The hydraulic gradient will increase to 0.0865, which is close to the allowable descent value recommended by Stormina. 1.1.5 By the end of May, long run Soviet experts Spirin and Kozlov