【作者】 方梦霞；

【导师】 程赫明；

【作者基本信息】 昆明理工大学 ， 工程力学， 2003， 硕士

【摘要】 本文首先阐述了电站在社会经济中所起的重要作用以及建成后坝体具有危害性一面。接着介绍反分析和位移反分析的应用现状和发展动态，提出了应用位移反分析反演坝体力学参数的可行性。 介绍了有关漫湾电站的工程概况以及内部观测系统。由于本文是在观测资料的基础上进行的计算，观测资料的正确和精确性对坝体弹性模量反演结果有直接的影响。因此对观测值的处理方法进行了介绍，对漫湾电站的观测资料进行全面分析，确定出漫湾电站目前的运行状态是在弹性阶段，以及坝体与基岩之间的关系。 为了计算能够顺利进行，建立模型是很重要的。建模时进行了模型的简化以及单元类型的确立、材料基本参数的取得、边界条件和约束条件的确定。进行模型检验，确定了计算模型。 从有限元基本方程出发，采用最小二乘法作为误差控制准则，推出弹性模量的迭代式。在ANSYS中对其进行二次开发，通过利用ANSYS中的参数化设计语言APDL编写了关于漫湾电站的建模和计算程序，并且ANSYS中得以很好的运行，最终得到38个时刻的弹性模量值。并对计算得到的结果进行分类讨论分析。计算结果表明弹性模量经过最初一年的增长后就进入衰减期，但是衰减趋势逐渐平缓。 最后，在上述研究成果的基础上，总结全文。对需要改进之处及今后进一步开展的研究工作提出有益的建议。更多还原

【Abstract】 At first, the important influence of the power plants and the danger of the built dams are expatiated in the social economy in this paper. The application and development of the back analysis and the back analysis of displacement are introduced and the research results of the field in our country and on the world are summarized. The feasibility of applying the back analysis of displacement to back analysis the mechanical parameters in the dams are proposed.Secondly, the general situation and the inner observed systems of Manwan are introduced. The calculation of this paper is based on these observed data and the validity and preciseness of these data is very important to the result, so that the method dealing of these data is bring forward. The observed information is fully analyzed, therefore we can confirm that the present running state of Manwan hydroelectric power plant is elastic state.The built model is very important to carry through the later calculation. The simplify of model, the selection of element type, the attainment of the basic parameters of material, the condition of boundary and restriction and so on is disposed. The model is verified after the employment.Based on the basic function of FEA, the iterated formula of modulus of elasticity is deduced through mathematical method as deviation control rule. The second exploitation is made on ANSYS and the procedure of building model and calculation is complied using ANSYS Parameter Design Language-APDL. The procedure has finished thirty-eight times calculation. The results and attain some rule are analyzed. The results of the calculation indicate that the modulus of elasticity of Manwan dam has entered the attenuation moment after increase and the attenuation will gradually lessen.At last, on the basis of analysis result the conclusion is drawn and the useful recommendation and perspectives are put forward.更多还原