底孔坝段温度应力场仿真研究

发布时间：2018-05-03 12:56

  本文选题：温度应力 + 混凝土浇筑温度　； 参考：《水利水电技术》2017年09期

【摘要】：针对坝身开孔后削弱了混凝土坝结构的整体性、孔口周围易产生应力集中并可能导致产生温度裂缝的问题,采用三维有限单元法对底孔坝段施工全过程进行温度应力场仿真研究,计算考虑了通水冷却、混凝土的水化热温升以及弹性模量等对底孔坝段温度和应力的影响,并对比分析了不同方案下坝体温度应力。结果表明:方案4(约束区Tp=18℃,非约束区Tp=22℃,通水冷却)在采取通水冷却和控制混凝土浇筑温度措施后,高程1 624.5~1 631.5 m范围内垫层常态混凝土最高温度为33.8℃,最大温度应力为1.50 MPa;高程1 626.5~1 646.5 m范围内碾压混凝土最高温度为26.8℃,最大温度应力为1.32 MPa;高程1 646.5~1 692.0 m范围内闸室以上常态混凝土最高温度为36.5℃,最大温度应力为1.45 MPa,从而坝段各区域的最高温度均小于允许最高温度,最大应力小于该工程的允许拉应力。研究成果为混凝土坝底孔坝段施工温度控制提供借鉴。
[Abstract]:The integrity of the concrete dam structure is weakened after the opening of the dam body, and the stress concentration around the orifice is easy to produce and may lead to temperature cracks. The 3-D finite element method is used to simulate the temperature stress field in the whole construction process of the bottom hole dam segment. The effects of water cooling, hydration heat temperature rise of concrete and elastic modulus on the temperature and stress of the bottom hole dam section are calculated. The temperature stress of dam body under different schemes is compared and analyzed. The results show that the maximum temperature of normal concrete in the inner cushion is 33. 8 鈩，

本文编号：1838571