长江三峡大江截流是目前世界上规模最大的深水截流工程 ,截流成败的关键在于堤头进占安全。为了掌握堤头坍塌规律并指导三峡工程大江截流的实施 ,在给出深水截流堤头坍塌计算式组的基础上 ,针对三峡大江深水截流进行了堤头坍塌计算 ,求出了在不同抛投料粒径、不同稳定坡度和不同流量条件下的堤头坍塌长度和体积 ,并点绘成图以便在实施过程中进行坍塌预报。计算及预报成果经三峡工程大江截流的实践验证 ,表明与实际坍塌情况相吻合 ,对保障安全截流起到了重要作用 The closure of the Yangtze River Three Gorges River is the world’s largest deepwater interception project, the key to the success or failure of river closure dikes into the safety. In order to grasp the law of dike head collapse and guide the implementation of the dam closure of the Three Gorges Project, based on the calculation formula for the collapse of dike head in the deep water cutoff, the dike head collapse calculation was carried out for the dam closure of the Three Gorges Project. Diameter, length and volume of dike head collapse at different stable slopes and different flow rates are plotted and plotted for the purpose of predicting collapse during implementation. Computation and forecast results have been verified by the practice of the Three Gorges Dam closure, which shows that it is consistent with the actual collapse and plays an important role in ensuring safety closure