N a watertight structure, usually of sheet piling, that encloses an area under water, pumped dry to enable construction work to be carried out. Below a certain depth a caisson is required 围堰; 一种防水建筑物，通常由钢板桩筑成防水层，将水下某一区域围住，并将结构内水排干以便可以施工，在水下一定深度时，需要佩戴潜水箱
The swell's data observed in the actual coffer dam demolition blasting have also confirmed the accuracy of model experiment achievement.
实际围堰爆破时的涌浪观测资料也验证了模型试验成果的正确性。
The stress state and seepage of anti-seepage walls under longitudinal RCC coffer dam of Linkuhydropower station are studied using 2d non-linear finite element method.
采用二维非线性有限元分析方法，研究了六库水电站RCC纵向围堰防渗墙的防渗效果和应力应变状态。
It was found that the flood, coming from the modern glacier area of the source, was caused by breaking of ice-dam and coffer-dam lakes formed by blocking of river with glacier movement.
初步查明洪水来自源头时现代冰川区，是由于冰川前进阻塞河道，形成冰坝湖、堰塞湖，其溃决酿成大洪水所致。
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