灯泡贯流式机组流道混凝土分期施工与承载特性研究

结合某灯泡贯流式水电站厂房工程实际,建立了包括基岩在内的地面厂房结构有限元模型,然后模拟实际工程中的分期施工方式,考虑接触非线性分析了厂房流道一、二期混凝土在不同接缝面处理方式下的承载特性。研究表明:流道一、二期混凝土接缝面植入钢筋或采用二期混凝土嵌入一期混凝土的方案均有利于提高一、二期混凝土的整体性,降低流道二期混凝土内拉应力大小和分布范围。因此灯泡贯流式水电站厂房流道一、二期混凝土接缝面处理建议采用二期混凝土嵌入一期混凝土的方案,并考虑接缝面植筋,以充分发挥一期混凝土的承载力,保证机组的安全稳定运行。

Research on the Stage Construction and Bearing Characteristics of Concrete Flow Channel of Bulb Tubular Turbine Unit

In combination with the engineering practice of a bulb tubular turbine hydropower station,a finite element model of the ground powerhouse structure including bed rock is established in this paper.Considering contact nonlinearity,the bearing characteristics of the first and second stage concrete of the powerhouse flow channel under different interface treatments are analyzed.The results show that it is beneficial to improve concrete integrity by implanting steel bars on the first and second stage concrete joint surfaces or embedding the second stage concrete in the first stage concrete.These treatments are effective in reducing the tensile stress and the displacement of the second stage concrete.This paper suggests adopting the embedded scheme for the joint surface of the first and second phases of concrete,and considering planting reinforcement to fully exert the bearing capacity of the first stage concrete and ensuring the safe and stable operation of the unit.