【作者】 兰春杰；

【导师】 陈胜宏； 杨志雄；

【作者基本信息】 武汉大学 ， 水工结构工程， 2004， 硕士

【摘要】 普定水电站位于贵州省乌江上游三岔河上，拦河大坝是中国第一座、也是当时世界最高的碾压混凝土拱坝，属等厚拱圈、变半径变中心角拱坝。 施工期间，坝体和坝基埋设了大量的观测仪器设备。大坝的原型观测项目有应力应变观测、温度观测、渗流观测、接缝观测和裂缝观测。根据贵阳院的施工记录，共有190个观测点，其中116个一直工作良好。 温度观测表明，设计阶段的温度计算结果与实测大体接近。但是，大坝运行6年后，1999年发现49条裂缝，其中两条裂缝上下游贯穿，导致轻微渗漏。 根据“七五”重点科技攻关成果，该拱坝不会出现裂缝。即使出现裂缝，也应首先在诱导缝开裂。显然，原研究成果与实际不符。所以，深入研究裂缝产生的原因进而对诱导缝进行合理布设是有意义的。 本论文的主要研究成果如下： 1)对ANSYS软件相关功能进行了整合，从而可以使之用于碾压混凝土拱坝施工和运行全过程的不稳定温度场和应力场仿真分析。 2)对影响坝体温度场的一些因素做了敏感性分析。 3)根据普定拱坝实际施工过程及运行情况，进行了全过程温度场全过程仿真计算，并与实际值作比较分析。 4)对普定拱坝进行了全过程非线性应力应变仿真分析，并与实测资料做了一定的比较，最终分析了坝体开裂可能原因。 5)总结了碾压混凝土坝的温控防裂特点及裂缝形成的原因，探讨了碾压混凝土坝温控防裂中的几个重要问题，并提出了一些可行的温控措施。更多还原

【Abstract】 Puding Hydropower Station is located in Guizhou province of China on the upper reaches of Wujiang river. The dam is the first roller compacted concrete arch dam in China and was also the highest RCC arch dam in the world at that tune. It was designed as an arch dam with constant thickness but variable radius and central angles.During the construction period, various observation devices have been arranged and embed in dam body and rock foundation. The prototype observation items of the Puding RCC arch dam include stress and strain observation, temperature monitoring, observation of joints, crack and seepage pressure. According to the construction record given by Guiyang Hydroelectric Investigation, Design and Research Institute of China, there are 190 observation instruments and 116 of those are still working very well.The temperature variations at some locations of Puding arch dam were obtained and the observation data show that the result of temperature filed simulation computation is generally consistent with the real condition. However after 6 years of operating, this arch dam was observed to have 49 cracks in January 1999. Above all, two of them penetrated from upstream face to downstream face and caused minor leakage.According to all the researches during the Seventh Five Year Plan period of China, crack would not occur in this arch dam during the construction and operation period. And even if cracking took place, it should be expected in induced joints instead of the other parts of the dam body. Obviously, this research conclusion is not consistent with the fact. Therefore, it is worth to do further research to find out the cause of crack in the dam body and the correct way of the induced joint deployment.The main research results are listed as follows:1) The functional parts of the software ANSYS has been re-organized, in this way the software can be used to simulate the transient temperature field and stress field of RCC arch dam during the construction and operation period.2 ) The sensitive analysis for the influence factors of dam temperature has been made. 3) According to the construction and operation record of the Puding RCC arch dam, the temperature simulation has been conducted. The calculation results have been comparedwith the monitored data.4) According to the construction and operation record of the Puding RCC arch dam, the stress simulation has been conducted. The calculation results have been compared with the monitored data, and the cause of crack has been analyzed.5) The temperature control requests and crack cause have been summarized. Based on these knowledge the feasible crack prevention measures have been proposed .更多还原