长沙综合枢纽二期施工围堰截流方案及优化试验

阐述长沙综合枢纽二期围堰截流方案,针对截流设计方案中存在的问题提出了优化方案,并采用1∶100定床物理模型,研究水流对截流戗堤的冲刷、水下抛石料的冲距及戗堤的稳定边坡坡度。试验表明,应选择合适的龙口位置及宽度,以减少对戗堤的冲刷;另外,通过水下抛石试验,得到不同粒径块石的冲距及戗堤稳定坡度,为施工组织设计提供了科学依据。以上结论已运用于长沙综合枢纽二期施工围堰截流的实际施工中,并保证了截流工程的顺利完成。

Stage II construction cofferdam scheme closure scheme and optimization experimental study of Changsha comprehensive hub

This paper expounds the Changsha comprehensive hub stage II cofferdam closure plan, and puts forward the closure design scheme for the problems existing in the optimization schemes. Using the 1:100 fixed bed model, we research the scour from the water flow to the closure dike, the scour reach of the underwater riprap and the stability slope of the dike. The experiment shows that, we should choose the right closure position and width to reduce the scour of the dike kung; In addition, through the underwater site test, we obtain the scour reaches of different-sized particles and the stability slope of the dike, which lays a scientific basis for the construction organization design. The above conclusions have been used in the comprehensive hub in Changsha second phase construction of river closure cofferdam actual construction, and guaranteed the smooth completion of the closure project.