高水头省水船闸闸室顶拉预应力钢索效果分析

穿黄工程隧洞方案的高水头省水船闸,可在深基坑两侧边坡上交错布置分散式省水池,闸室墙后回填土低、临空高度大。针对高水期闸室底板负弯矩过大的问题,提出一种带顶拉高强钢索的整体式结构。利用ABAQUS软件建立平面有限元模型,分析钢索在完建期、高水位期、低水位期和检修期4种工况下的作用,研究钢索直径影响和预应力的效果,基于单位索力效用指标提出一种预拉力估算方法。结果表明,钢索主要在高水位期发挥作用,直径越大效果越明显;通过施加预应力可进一步提升钢索效果;提出的预拉力估算公式是合理可行的。

Analysis on effects of installing pre-stressing wire rope on top of high water head water-saving ship lock chamber

The high head water-saving ship lock for tunnel scheme of the Yellow River-crossing engineering can arrange the scattered water-saving pools alternately on both sides of the deep foundation pit,and the backfill behind the lock chamber wall is low and the free height is large. For the problem of the baseplate’ s excessive negative moment of the high water head water-saving ship lock chamber in the high-flow period,we propose an integral structure with top-pull high-strength wire rope,use the ABAQUS finite element software modeling analysis to conduct focused research on the function of wire rope in four working conditions of completion period,high water level period,low water level period and maintenance period,analyze the effect of wire rope diameter and prestress,and propose a pre-stress estimation method based on unit cable force effect. The results show that the wire rope mainly plays a role during the high-flow period,and the larger the diameter is,the more obvious the effect is.The function of the wire rope can be further enhanced by exerting the pre-stress. The pre-tress estimation formula proposed in this paper is reasonable and feasible.