旬阳水电站超大弧门推力泄洪闸预应力闸墩设计

Design of pre-stressed sluice pier for the super-large radial gate thrustspillway at Xunyang Hydropower Station

旬阳水电站泄洪闸闸墩承受的荷载以及结构较复杂,弧门尺寸为14m×25m(宽×高),弧门总推力高达72094kN,为目前国内已建水电工程中最大弧门推力。为降低超大推力在闸墩颈部产生的较大拉应力,采取预应力锚索、锚块上游部位颈缩、锚块设置拱向下游的空腔等措施。通过三维有限元的计算分析及运行实践表明,这些措施能有效控制闸墩锚块上游支铰处颈部产生的较大拉应力,预应力闸墩总体受力比较均匀,应力水平较低。本文内容可为类似工程提供一定的设计思路。

The spillway piers at the Xunyang Hydropower Station bear complex loads and have a complicated structure.The radial gate measures 14m×25m(width×height),with a total thrust of 72,094 kN,making it the largest radial gate thrust among hydropower projects built in China.To reduce the large tensile stress generated at the neck of the pier due to the enormous thrust,measures such as pre-stressed anchor cables,neck tapering at the upstream side of the anchor block,and the creation of a downstream-facing cavity in the anchor block were adopted.Through three-dimensional finite element analysis and operational practice,these measures have been shown to effectively control the large tensile stress at the neck near the upstream hinge of the pier anchor block.The pre-stressed pier exhibits relatively uniform overall stress,with low stress levels.This study can provide useful design insights for similar engineering projects.