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座落在马尼可畏根河上的加拿大丹尼尔约翰逊连拱坝,坝商214m,坝长1,314m,库容1,418亿m~3,居世界第五位,于1968年建成。坝体混凝土量226万m~3,若采用重力坝,混凝土量将增加4倍。该坝在拱内靠近基础部位发现了深裂缝,使得大坝的安全系数减小了一半,剪应力安全系数已从3降至2.3(夏季)和1.6(冬季)。经过两年的详细研究,认为发生裂缝的原因是:坝的几何尺寸不足,在极寒冷的条件下,由
Situated on the Manichev River, the Canadian Daniel Johnson Arch Dam is 214m high with a dam length of 1,314m and a storage capacity of 141.8 billion m³, ranking fifth in the world and completed in 1968. The dam concrete volume of 2260000 m ~ 3, if the gravity dam, the amount of concrete will increase 4 times. The dam found deep cracks near the foundation within the arch, reducing the safety factor of the dam in half and reducing the safety factor of shear stress from 3 to 2.3 (summer) and 1.6 (winter). After two years of detailed study, the reason for the occurrence of cracks is that the geometry of the dam is not sufficient, and under extremely cold conditions,