一、概述葛洲坝水电站是我国长江干流上第一座大型河床式水电站。厂房蜗壳系钢筋混凝土空间结构,是该电站的主要通流构件,设计的好坏直接影响电站的安全运行。在以往的设计中,对蜗壳的温度应力往往按均匀温差法计算,甚至忽略不计,这就不能反映构件的真实情况。二江电站厂房大机组蜗壳的最大过水流量为1130秒立米。其进口最大净宽31.2米,最大 I. Overview Gezhouba Hydropower Station is the first large-scale riverbed hydropower station on the Yangtze River in China. The volute is the main flow component of the power plant. The design of the power plant directly affects the safe operation of the power station. In the past design, the temperature stress on the volute is often calculated by the uniform temperature difference method, or even ignored, which can not reflect the real situation of the component. Erjiang Power Plant large volute case of the largest cross-flow of 1130 seconds cubic meters. The largest net import width of 31.2 meters, the largest