长管袋褥垫沉排坝出险机理浅谈

Discussion on emergency mechanism of dike built with mattress of sand-filled long tubular sacks

长管袋褥垫沉排坝已在黄河下游多处河道整治工程中得到了应用。按照设计思想,这种新坝型的出险几率应该远小于传统坝,但在实际工程运行中,这种新坝型也出现了次数较多的险情。根据模型试验成果和实际工程观测结果,对比分析了出险的原因。认为褥垫沉排的长度对长管袋褥垫沉排坝稳定起决定作用,沉排长度设计不足是造成原型工程险情不断的主要原因,适当加长沉排长度,可以达到建成后不抢险的目的。

The dike built with mattress of sand-filled long tubular sacks has been applied in several fiver training works on the Lower Yellow River. In accordance with the design concept, the emergency probability of the new type of dike is to be lower, however, more emergencies have occurred on the dikes during the actual operations, for which the contrastive analysis is made herein on the cause of the emergency concerned, It is considered that the length of the mattress plays a key role on the stability of the dike, the main cause of the emergencies continuously occurred on the dikes is that the length of the mattress sack is underesti- mated during the design, and then if the mattress sack is properly lengthened, the target of emergency-free of the dike can be accordingly got after the completion of the works.