【作者】 于斌；

【导师】 潘维宗；

【作者基本信息】 山东大学 ， 水工结构工程， 2008， 硕士

【摘要】 近海平原地区是我国经济最发达的地区之一,然而该地区水资源十分紧缺,这严重制约了国民经济的发展。在该地区兴建的现有平原水库标高不高、库盘大、蓄水浅、占地多、渗漏量大、经济效益低,因此对现有平原水库增容扩建势在必行。平原水库大多建造在软土地基上,坝轴线较长,距离村庄比较近,渗透破坏危害性巨大,渗流分析与防渗措施是平原水库增容扩建的核心关键问题。本文首先介绍了渗流基本理论和控制方程,对利用有限单元方法计算土石坝稳定渗流场进行了研究和分析,并阐述利用体积加权法计算稳定渗流场的原理和步骤。在对比渗流方程和热方程的相似性的基础上,得出可以利用ANSYS热模块计算分析坝体渗流问题的结论。然后在随机理论的基础上介绍了土石坝渗透系数随机反演算的方法与步骤,利用ANSYS程序中的优化设计模块以及对程序中参数设计语言APDL进行二次开发,编制了土石坝稳定渗流分析程序以及渗透参数反演程序,在ANSYS中实现了土石坝稳定渗流场的有限元分析。本文在随机理论的基础上,获取了天津尔王庄水库现状坝体与坝基各土层渗透参数的对数正态分布规律,利用编制的ANSYS土石坝渗透参数反演算程序,得出贴近实际的现状各地层渗透参数,并以此为依据利用编制的ANSYS稳定渗流分析程序确定高喷防渗板墙在透水层的深度,同时对尔王庄水库立扩增容方案中的两种加高方案的渗流场进行了分析,确定高喷防渗板墙全封闭透水层与上游坝坡铺设复合土工膜的联合防渗措施,稳定渗流结果表明,两种加高方案在防渗措施下均能满足稳定渗流要求。本文对尔王庄水库增容扩建工程稳定渗流分析子课题的研究具有重要工程意义,能达到对尔王庄水库除险加固、增容扩建、节省大量土地与水资源的目的,将产生巨大的经济效益和社会效益,有重要的工程参考价值,能进一步推动对平原水库增容扩建技术的探索。更多还原

【Abstract】 Coastal plain region is one of the most developed regions in China, but the shortage of water resources has seriously restricted the national economic development in the region. The existing plain reservoirs have many problems, so it is urgent to improve the capability of existing plain reservoirs. Most of plain reservoirs were built on soft ground, which may result in serious calamity. Therefore, Seepage analysis and control measures are key issues in plain reservoir expansion.The basic theory and the control formula of seepage problem were introduced in this paper. On the foundation of similarity of the seepage flow equations and heat equations, the conclusion of the ANSYS/Thermal module used to analyze and compute the dam seepage flow problem had been worked out. Then, the Methods and steps of back analysis of seepage coefficient based on stochastic theory were introduced. On the basis of the optimization designing module and developing for APDL language in ANSYS, the seepage procedure of earth dam and the back analysis procedure of seepage coefficient were complied.Based on stochastic theory, the results of the analysis suggest that the distribution of hydraulic conductivity of Tianjin Erwangzhuang reservoir is lognormal. Using the analysis procedure, seepage coefficient and the depth of high-pressure gunite seepage-preventing wall is received. In addition, through the analysis of two programs of improving the capability, the results demonstrate that seepage flow requirements can be met with the anti-seepage measures.There is an important engineering significance for the study of improving the capability of Tianjin Erwangzhuang reservoir. The research will produce tremendous economic and social benefits and further promote technology.更多还原