三峡工程明渠截流龙口护底模型试验与原型对比

通过定床或动床试验对拦石坎的范围、位置、结构,材料及度汛防冲和对通航的影响等进行了试验比较,最后确定了上下游龙口段分别设置钢架石笼及合金钢网石兜拦石坎方案.拦石坎的设置显著提高了抛投块体的稳定性,大大减少了合龙抛投材料的流失量,其极限抗冲流速超过9m/s,并且满足了设计要求的长航、地航船队的通航水流条件.模型试验各项水力指标与原型是一致的,通过原模型对比进一步表明拦石坎的设置是保证三期截流成功的一项重要措施.

Comparison of model test research and prototype of river bottom protection in the open channel closure gap of Three Gorges Project

By the model test of fixed bed and movable bed,and comparison study on the gravel barrier range,position,structure,materials,flood erosion control and influence on the navigation and etc,the final conclusion is made for the gravel barrier scheme of setting steel gabion and alloy steel tuch net within stone in upper gap and lower gap of banquette separately,which can obversely enhance the stabillity and reduce the loss of the dumped rockfill materials swept away in the river closure,the maximum risisting flo...