Study On Temperature Control And Cracking Prevention Of RCC Gravity Dams In High Temperature Areas

Focused on the subjects of temperature control and cracking prevention, this paper is mainly about the study of the simulative calculation of the unsteady temperature and thermal stress field in the RCC gravity dams. The research of temperature control and cracking prevention of the high temperature area dams named Nansha RCC gravity Dam and Madushan RCC gravity Dam are both presented in the paper. The main contents are as follows:1. Based on the previous research, the theory of temperature and thermal stress field of concrete are generally introduced as well as the FEM equation for calculation. The iteration method of computing water pipe cooling in concrete is also introduced.2. Owing to multi-lift characteristics of RCC gravity dams, great efforts of calculative work should be taken for computing temperature and thermal stress fields of the dams. A non-homogeneous multi-laminate element model is put forward to reduce the efforts. Using the model not only makes theory rigid in simulative calculation, but also reduces the efforts of calculative work, and giving example to the later simulative computing the temperature and thermal stress field of RCC gravity dams. Finally the real project named Nansha RCC gravity Dam and Madushan RCC gravity Dam are both presented to validating the model.3. According to the values of temperature attained by the test, using the method of GA to reverse several parameters of concrete. Then according to the gotten parameters, simulative calculation of temperature and thermal stress field can be done to instruct the later construction. This method is scientific and feasible.4. The birth of thermal stress and its characteristic of RCC dams are introduced, as well as familiar method of temperature control and cracking prevention in RCC dams.5. Based on the Madushan RCC gravity Dam Project, temperature control and cracking prevention of a typical overflow section block of the RCC gravity dam is studied as a case study.