【作者】 邓苑苑；

【导师】 刘建军；

【作者基本信息】 石河子大学 ， 农业水土工程， 2006， 硕士

【摘要】 土石坝是我国最多的坝型,也是世界上建成的坝型最高的水工结构,它具有对地质条件要求低,造价低廉的特点,因而,越来越多的人从事土坝的研究。在土坝研究中,土坝的安全一直是人们追逐的热点,而威胁土坝安全的又主要是严重渗流造成的破坏,所以,土坝渗流问题越来越引起社会的关注。在我国由于许多土石坝建于五、六十年代,在当时经济、技术条件匮乏的情况下,都是“三边”工程,这些土坝经过几十年的运行,坝体坝基都不同程度上存在不少问题,许多都已被列为“病险库”,影响了正常使用及效益的发挥。因此对病险土石坝一系列研究就显得很有意义。本文正是基于以上原因展开对土坝渗流分析。本文论述了不同条件下渗流微分方程的建立及其定解条件,并推导了渗流问题中有限元的计算公式,在ANSYS软件中引用温度场来计算渗流问题,运用“生死单元”技术法利用APDL语言开发了二维稳定渗流的程序,使用该程序计算自由面只需进行一次网格剖分,通过迭代即可较准确地求出自由面的位置。通过算例验证了程序的正确性,本文的算例取的是新疆夹河子水库(大二型)1+850断面,其水位为正常蓄水情况下的稳定渗流计算。最后,本文还为夹河子水库除险加固提出了建议。本文的研究工作在改进和完善计算渗流自由面方法方面进行了有益的尝试。用ANSYS温度场来分析渗流问题具有方便、快捷的优点,同时可信度高,是一种有发展前景的计算方法。更多还原

【Abstract】 Earth dam is widely used in China.It is the highest type of dams in the world. earth dam has advantages of lower requirement to terrain conditions and less cost. More and more scientists are engaged in researching it .The security of earth dams is always the hot top and the serious seepage is the most important in fluency factor in all factors resulting in the earth dam destruction. In our country, many hydraulics structures constructed in 1950’s or 1960’s were constructed in scarcity of technology and economy. All sorts of problems have appeared in working of many years. Its normally use and benefit are influenced. Therefore, It is meaningful to studies a series risky of disease Earth dam. The analysis of seepage through earth dams is evolved by the reason of above.This paper set up of various kinds of seepage differential equations as well as their solving terms. Using the Temperature model to calculation the seepage problems and use APDL Language to calculation tow-dimension finite element program of steady seepage problem on the foundation of the seepage problem finite element method formula. Using the method to calculate free surface which only one gridding is needed, the position of free surface can be gained precisely through reiterative calculation. The examples show that variable seepage coefficient of element method is correct. The case which using in this paper is 1+850 transect of Juarez reservoir dam calculation the steady seepage problem of normally water level. At last this paper give some availability suggestions to reinforcing the earth dam.An attempt on the development and improvement of calculation seepage free surface methods is presented. Using the Temperature model of Ansys to analysis the problems of seepage is more convenience and shortcut. This method has more amplitude foreground.更多还原