摘要
高混凝土坝温度应力是导致坝体上游劈头裂缝以及内部贯穿裂缝的重要原因.如何依据实测资料正确反馈分析温度场,是计算大坝真实应力状态、全面评价大坝安全可靠度首要解决的问题.探讨了基于有限元法的温度场反馈分析模型,给出了边界条件、施工参数、材料参数等的确定方法;提出了两种推算实际库水温度变化的近似方法;指出反馈模型调整的关键问题在于通水冷却、坝踵附近边界条件及基岩温度;最后通过索风营重力坝对反馈分析模型进行了应用验证.
Thermal stress can be one of main causes of the upstream-surface cracking and inner go-through cracking for high concrete dams. The back analysis of temperature field plays an important role in the real stress calculation and safety assessment of dams. Here the back analysis model is discussed; and the determinations of boundary conditions, construction parameters and material parameters are given in detail. Two approximations are given to obtain the upstream-surface water temperatures. It is also pointed out that the key problems in back analysis model are the pipecooling, real boundary conditions near the dam heel and the rock temperature. Finally, taking Suofengying Dam for case study, the model is wrified.
出处
《三峡大学学报（自然科学版）》
CAS
2014年第2期11-16,共6页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金青年基金项目(51009056)
教育部博士点新教师基金(20100094120005)
水资源与水电工程科学国家重点实验室开放基金(2012B103)
关键词
混凝土坝
温度场
反馈分析
模型辨识
concrete dam
temperature field
back analysis
model recognition
