【作者】 贺金仁；

【导师】 朱岳明；

【作者基本信息】 河海大学 ， 水工结构工程， 2003， 硕士

【摘要】 本文围绕高碾压混凝土重力坝的温控防裂问题，从理论和实践上系统地研究了高碾压混凝土重力坝温度场和徐变应力场的仿真计算理论，并对龙滩高碾压混凝土重力坝的温控问题进行了详细的分析和研究。主要内容如下： 1．由于碾压混凝土坝成层浇筑的施工特点，给大坝三维温度场和徐变应力场全过程仿真计算带来了巨大的计算工作量，特别在高碾压混凝土坝中尤为突出。为了降低仿真计算的计算规模，减小计算机时， 以便高碾压混凝土重力坝的三维仿真计算能有效地予以实现，本文提出了非均质层合单元仿真计算模型。运用此模型，使温度场和徐变应力场的仿真计算从理论上趋于严密，精度更为精确，从而解决了高碾压混凝土重力坝温度应力施工仿真计算规模大的难题。 2．提出了可以同时获取多个混凝土热力学参数的反演分析方法。该方法所需设备简单，消耗成本少，同时也简化了试验的难度，给出的混凝土试块温度场解析解使得该方法更加简便。 3．针对混凝土中埋设冷却水管的问题，利用水体热量平衡原理，推导出求解冷却水边界沿程水温的有限元计算方程。采用三维有限元迭代解法，能够精确地实现有冷却水管高碾压混凝土坝温度场的三维仿真计算。 4．基于本文提出的温度场和徐变应力场仿真模型理论，编制了高碾压混凝土坝的三维有限元仿真计算程序，在程序中考虑了各种温控措施的数值模拟，包括：水管冷却、冬季保温、降低混凝土的浇筑温度、夏季混凝土表面喷水雾、施工汛期坝顶面过水等。 5．以“十·五”国家电力公司科技攻关项目为背景，深入系统地进行了龙滩高碾压混凝土重力坝典型溢流坝段的温控防裂研究。更多还原

【Abstract】 Concentrated on the questions of temperature control and crack prevention studies on high RCC gravity dams, simulative calculation theories of temperature and stress fields of high RCC gravity dams are systematically studied in theory and practice, the temperature control of Longtan high RCC gravity dam is analyzed and studied in detail. The main contents are as follows:1. Owing to multi-lift characteristics of high RCC gravity dams, great efforts of calculative work should be taken for computing 3-D temperature and stress fields of the dams. A non-homogeneous multi-laminate element model is put forward to reduce the efforts, making 3-D simulative calculation of high RCC gravity dams realized. Using the model not only makes theory rigid in simulative calculation of temperature and stress fields, but more precise in calculative results, resolving the difficult problems of large-scale in simulative calculation of high RCC gravity dams.2. A back analysis method for multi-parameter identification of concrete is suggested; it needs simple testing equipments only, costs little, and reduces the difficulty of test.3. The FEM equations of computing water temperature in cooling water pipe are deduced by the principle of water-body heat quantity equilibrium to resolve the problem of water pipe cooling in mass concrete. Using the solution of three-dimensional FEM iteration method makes 3-D temperature field calculation of water pipe cooling in high RCCD more precise.4. Based on the simulation model theory of temperature and stress fields presented in this article, a large simulating program for high RCCD has been developed, which can numerically simulate all kinds of temperature control measures, including water pipe cooling, heat insulating in winter, reducing place temperature of concrete, spraying water brume, and long interval over-watering surfaces overflowing in flood season..5. Based on Longtan project, temperature control and crack prevention of a typical overflow section block of the high RCC gravity dam is studied as a case study.更多还原