【作者】 赵本基；

【导师】 周宜红；

【作者基本信息】 武汉大学 ， 水工结构工程， 2004， 硕士

【摘要】 在碾压混凝土重力坝施工期，温度是主要荷载之一，其仿真分析是碾压混凝土重力坝设计和施工的重要研究内容。论文根据碾压混凝土重力坝薄层碾压、快速施工的特点，提出用国际通用大型有限元软件ANSYS进行其施工期温度场和应力场仿真分析，并将ANSYS软件的有关功能加以组合，综合考虑了外界气温变化、水泥水化热随龄期变化、不同的浇筑温度及分层的实际影响，提出了仿真实现过程。该方法不仅误差小、精度高，而且能直观地反映计算结果、操作简单、适合各层次人员使用，具有较大实用价值。 龙滩碾压混凝土重力坝是目前世界上在建的最高的碾压混凝土坝。论文对龙滩工程11#挡水坝段施工期的温度场作了仿真计算，得出了施工期温度场对地基范围大小并不敏感、外界气温及浇筑速度对施工期温度场影响很大，但对应力场影响并不大。因此，对于碾压混凝土重力坝的设计施工我们更应该关注坝体截面不同部位的应力分布。 论文综合考虑了混凝土弹性模量、徐变度随龄期变化等特性，用ANSYS软件进行了碾压混凝土重力坝施工期应力场仿真计算。最后，论文通过对已建碾压混凝土坝温控与裂缝资料的分析，总结了碾压混凝土坝的温控防裂特点及裂缝形成的主要原因，并提出了裂缝危害性顺序。同时，论文还对碾压混凝土坝温控防裂中的一些重要问题作了探讨，得出了我国现行的温控标准过严、碾压混凝土坝可不采取复杂的温控措施等结论，并提出了可行的一系列温控防裂措施，可供碾压混凝土坝温控防裂设计借鉴和参考。更多还原

【Abstract】 Thermal stress is one of’the main stresses of RCC (Roller Compacted Concrete) gravity dam during construction period, so simulation analysis on it is a very important research subject. In this paper, based on the construction characteristics such as thin-layer placement and continuous construction of RCC gravity dam, ANSYS software, a world wide popular common software used in finite-element analysis, is suggested to simulating the temperature field and stress field of RCC gravity dam during construction period. By congregating some advanced functions of ANSYS, the procedure of simulation is provided, in which, the change of atmosphere temperature and concrete hydration heat changing with the age and the initial temperature of concrete as well as the real effect of placing in layers are all taken into account. This method not only has less errors and more precise results, but also shows the results directly and makes the operation more simply, so technicians of any level can use it. This will have some practical values.Longtan RCC gravity dam is the highest RCC dam in construction of the world at present. In this paper, the temperature field of the 11th section of longtan RCC gravity dam during construction period is given by use of ANSYS software. The results of analysis indicate that the ambient temperature and construction velocity has grate effect on the maximum temperature in the RCC gravity dam, but the foundation size and the stress field has less effect. So more attention should be put on the different stress distributing of the points at the different part in the dam.Based on the characteristics such as modulus of elasticity and unit creep changing according to concrete age, the procedure of simulation on thermal stress of RCC gravity dam during construction period is provided by use of ANSYS software. Finally, according to the information in the field of temperature control and crack of some RCC dams domestic and foreign, this paper summarize the features of temperature control and crack-proof for RCC dam and the primary cause producing the cracks, also, list the rank of crack kinds according to their endangerment to dam body. Meanwhile, some important problems in temperature control and crack prevention for RCC dam are discussed, thereby revealing that the active temperature control standard in our country is too strict andcomplex temperature control measures are not necessary for RCC dam, and so forth. According to above conclusions, a series of reasonable temperature control and crack-proof measures for RCC dam are provided, which will be useful for reference in the aspect of temperature control design and crack-proof measures for RCC dam.更多还原