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1964年内蒙古哲里木盟修建的舍力虎水庫鋼筋混凝土泄水閘,位于狹长河谷中,两岸为高达10～15米的流动沙丘,基础开挖面积近4200平方米,水下最大开挖深为3.8米。根据钻探資料,基础全部为細沙(d=0.05～0.5毫米),且施工前水庫已蓄水,水位高于基坑开挖面3.6米,围堰也是用沙子筑成的,所以渗流量很大。根据上述情况,判断基坑开挖时必
Built in 1964 by the Inner Mongolia Zheli Union Sheryl Tiger Reservoir Reinforced Concrete Sluice Gate, located in the narrow valleys, both sides of the flow of sand dunes up to 10 to 15 meters, the foundation excavation area of nearly 4200 square meters, the maximum depth of excavation was 3.8 meters. According to the drilling data, the foundation is all fine sand (d = 0.05-0.5 mm). Before the construction, the reservoir has been impounded and the water level is 3.6 meters higher than the excavation face of the foundation pit. The cofferdam is also constructed of sand so that the seepage rate is very high Big. According to the above situation, to judge the excavation must