山区河道截流中分流丁坝布置方案研究

基于山区河道河床比降大、导流建筑物在截流初期泄流能力偏小等特点,将丁坝应用于山区河道截流施工中,采用模型试验方法研究了单侧导流条件下丁坝的布置方案。结果表明,丁坝宜布置于导流建筑物进口对岸进口中间点偏下游侧,丁坝长度对河道的束窄率介于30%~40%之间,就能够有效减小截流龙口落差,增大分流建筑物分流比。

Research on the Layout of Groin Spur Dike in the Mountain River Closure

Because of large river bed slope and poor conductivity of diversion structures in the initial period of closure, the groin spur dike is employed to reduce the difficulty of mountain river closure. Model test method is used to study the layout scheme of groin spur dike at the condition of single lateral river diversion. The results show that the proposed position should be located at the other side and corresponding to the range of downstream middle point of diversion building inlet, and the length of groin spur dike needs reach to the river narrowed rate between 30% to 40%. Recommended groin spur dike arrangement scheme can effectively reduce the closure water fall and increase the diversion ratio.