【作者】 王永新；

【导师】 张仲卿；

【作者基本信息】 广西大学 ， 水工结构工程， 2005， 硕士

【摘要】 碾压混凝土技术被用到筑坝上以来发展迅速,从最初的重力坝到后来的拱坝,均显示了其强劲的生命活力。碾压混凝土与常规混凝土在温度特性、材料特性、施工方法等方面有很大的不同。从最初以研究常态混凝土坝温度应力的方法到现在对其温度应力的基本正确认识,使得大量的碾压混凝土坝得以修建并正常运行。温度应力是碾压混凝土拱坝裂缝的主要原因,目前坝工界对温度应力、温度控制、分缝设计等方面的研究已经取得了大量的成果。但是由于拱坝结构复杂,人们始终对碾压混凝土拱坝抱着谨慎的态度摸索前进。 本文结合即将设计修建的云南万家口子高碾压混凝土拱坝主要进行了以下几方面的研究工作: 1.首先进行无缝拱坝施工过程中的仿真计算,确定施工过程中坝体的温度场与应力场。根据计算结果可以为选择合理的温控方案和分缝方式提供依据。 2.对万家口子拱坝提出建议的温控措施。低温季节浇筑下部混凝土并进行保温和通水冷却,高温季节浇筑上部混凝土,最好是夜晚浇筑白天停浇并降低出机温度和通水冷却。 3.采用接触单元对含横缝的碾压混凝土拱坝进行仿真研究。通过对不同位置设置的横缝以及条数的的变化进行的研究,分析横缝对碾压混凝土拱坝温度应力的影响,并提出比较合理的横缝布置供设计参考。 4.对横缝与诱导缝进行辩证思考,指出其优缺点以及各自适用的范围。对高碾压混凝土拱坝分缝方式提出一些设想,希望在工程中能得到论证。 5.对万家口子高碾压混凝土拱坝进行体型优化研究。分别以应力为目更多还原

【Abstract】 It is promoted rapidly since technique of Rolled Compacted Concrete was used on dam construction. From gravity dam to arch dam, both of them appear vivid energy. RCC differs from general concrete in many ways, such as temperature characteristic, material characteristic, construction and so on. At first we study thermal stress of RCC as general concrete wrongly and now we have got basic right acknowledgement. For this, many RCC dam were built and run safely. Thermal stress is the main cause of cracks of concrete arch dam, now the engineers have got abundant results in thermal stress, temperature-control and joints design. Whereas the complexity of structure of arch dam, we always feel around cautiously in the way of study on RCC arch dam.In this paper, we study the following problems mainly cooperated Wanjiakouzi RCC arch dam which will be built in Yunnan province.1. We shall first fix the temperature filed and thermal stress field of jointless dam in construction period through simulation calculating. According to calculation result, we can design the reasonable temperature control scheme and jointing mode.2. We shall prose temperature-control scheme for Wanjiakouzi RCC archdam. The underpart concrete had better constructed in low temperature season and measure of heat preservation and cooling by water should be carried out. Top concrete can be constructed in high temperature season. It had better constructed at night and lowered temperature of mixed concrete and cooled by water.3. We shall carry out simulating calculation for arch dam including transverse joints which contact element will be adopted. Making analyse for influence of transverse joints of vary location and quantity and putting forward reasonable joints dividing scheme for reference of design.4. Debating for transverse-joint and induce-joint and indicating their advantages and disadvantages and individual applying range. We put forward some assumes for joints dividing and hope they can be verified in project.5. Optimization studying for shape of arch dam was carried out. The optimization of goal for stress and goal for volume are studied individually. The optimization shape of improving stress distributing at lowest volume was found.更多还原