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本文通过三维结构模型试验,分析了岩滩水电站溢流坝预应力闸墩的工作性态和各种预应力措施的工作效益。岩滩水电站溢流坝闸墩,采用4组锚束,即对拉主锚束、水平次描束、竖直次锚束及斜锚束。本文不仅对闸墩在施工期、正常运行期、事故检修期下的应力状态进行了分析,而且还对各组预应力、主要外荷载进行了单独分项分析。试验结果表明,闸墩受弧形闸门推力作用时,闸墩上有三个部位为应力控制的关键部位,若不采取预应力措施,结构难以满足抗裂和变形要求。其中一侧弧形门关闭、一侧弧形门开启为最不利工况。预应力措施的工作效益明显,有效地改善了闸墩上三个关键部位的应力状况,主锚束和水平次锚束在此起到了决定性的作用。斜锚束预压效果较好,作为补充措施是必要的。另外,竖直次锚束工作效益不显著,可考虑取消或少量布置。
In this paper, through the three-dimensional structural model test, the working behavior of prestressed pier of overflow dam of Yantan Hydropower Station and the benefits of various prestressing measures are analyzed. Yantan Hydropower Station Spillway dam pier, the use of four anchor beam, that pull the anchor beam, horizontal beam, vertical sub-anchor beam and oblique anchor beam. This paper not only analyzes the stress state of the pier under construction, normal operation period and accident overhaul period, but also separately analyzes the prestressing force and main external load of each group. The test results show that when the pier is subjected to the thrust of the arc gate, there are three parts on the pier which are the key parts for stress control. If prestressing measures are not taken, the structure can not meet the requirements of crack resistance and deformation. One side of the arc-shaped door closed, one side of the arc-shaped door open for the most adverse conditions. The work efficiency of the prestressing measures is obvious, which effectively improves the stress conditions of the three key parts on the pier. The main anchor beam and the horizontal sub-anchor beam play a decisive role here. Diagonal anchor beam preload effect is better, as a supplementary measure is necessary. In addition, the vertical sub-anchor beam work efficiency is not significant, consider the cancellation or a small amount of layout.