重复组装式导流桩坝设计指标分析

Analysis of Design Index of Repeatable Assembling Flow Guiding Pile

根据重复组装式导流桩坝在黄河下游欧坦抢险工程的总体布置方案，结合抢险工程特定的施工环境、工程自身的安全要求以及实际的水沙情况等，研究确定了该坝的设计流量及相应水位，结合以往工程经验确定了其合理的平面尺寸，并对存在的问题进行了总结。结果表明：①为保证安全，需在根据设计流量确定相应桩顶高程后预留0.1-0.2 m的超高；②尽可能采用最大冲刷深度来确定设计桩长；③应加大桩径、维持桩间距，以减小透水率。

Accordinf to the overall layout scheme of the re-assembled diversion pile dykes in the Outan emerfency works on the lower Yellow River, and considerinf the specific construction condition of the emerfency works,the security requirement of the works itself as well as the actual water and sediment conditions,we had studied and determined the desifn flow rate of the dyke and the correspondinf water stafe,and,with the past ex-perience of works considered,had decided its rational plane size,and had summarized the problems existinf in the desifn after implementinf. The results show that：a）we should reserve an extra elevation of 0. 1-0. 2 m after determininf correspondinf pile elevation accordinf to the desifn flow rate;b）we should try to use the maximum scour depth to determine the desifn pile lenfth;c）we should adopt larfer pile diameters and maintain pile interval in future application to reduce permeable rate.