【作者】 黄站峰；

【导师】 刘川顺；

【作者基本信息】 武汉大学 ， 水利水电工程， 2005， 硕士

【摘要】 堤防和土石坝工程最大的问题就是容易发生渗透破坏和滑坡险情,渗流分析计算既是堤坝渗透安全性评价的依据,也是边坡稳定性计算分析的基础。然而,土石坝渗流的计算机模拟是具有一定难度的,当大坝剖面复杂时往往得出奇异、紊乱的渗流场;另外,渗流有限元计算操作过程比较复杂,工程中常用的一些渗流计算软件大多没有简便的前处理界面。因此,研制界面友好、操作简便且适用性广泛的土石坝渗流计算程序是很有必要的。目前多数渗流计算仅考虑饱和区域地下水流运动,实际上自由面以上的非饱和区域也存在土壤水分运动。因此,更全面地把饱和与非饱和土作为一个整体来研究渗流问题也是很有必要的。 本文介绍了有限元渗流计算的原理,研制了具有广泛适用性的土石坝渗流有限元计算程序。本文的具体研究内容包括: (1) 推导了二维饱和、三维饱和—非饱和渗流的数学模型和有限元计算方法; (2) 编制了基于二维饱和理论的堤坝渗流有限元计算程序SEEP2,并用VC6.0编制了前处理界面,具有导入DXF图形文件的CAD接口; (3) 对常见形式的土石坝进行了饱和、饱和—非饱和渗流对比计算,分析了这两种理论渗流计算结果的差异。 本文的主要研究成果是:编制了二维饱和堤坝渗流有限元计算程序SEEP2,并开发了前处理界面程序,前处理界面包含导入DXF格式图形的CAD接口。 通过算例分析及和国外土工有限元计算软件PLAXIS的对比表明SEEP2的计算结果是合理可靠的,且操作比较简单,有比较便捷的前后处理接口。通过饱和、饱和—非饱和理论程序的对比计算得出结论:给水度的选取对非稳定饱和渗流计算结果影响很大;饱和—非饱和计算的渗流自由面在稳定渗流时会出现“上消下涨”,出溢段抬高的现象;水位下降时,饱和理论比饱和—非饱理论计算的渗流自由面下降要快。更多还原

【Abstract】 Seepage destroys and coasts are the problems, which often occurs on embankment engineering, seepage analysis is an important work on the design of civil engineering. When design or evaluate an embankment, the first step we should do it is calculate and analysis the seepage field, but the seepage field calculation is not an easy thing. We often get a bizarre and disorderly seepage field when the embankment is complexity. When we use FEM software to calculate a problem, we should prepare an input data file at first, if the file has to be created by hand, it is will be a very hard work. At present time, the most FEM software of seepage has not an easy way to generate the input data file. Usually we use saturated theory to calculate the seepage field of embankment, but it can’t fit the truth. In the embankment, water flows not only in saturated region but also in the unsaturated region. So it is necessary to use the saturate-unsaturated theory when calculate the seepage field of embankment.In this thesis, the major work as following:(1) Give an introduce of seepage analysis model and a brief study on the theory of saturate and saturate-unsaturated seepage of FEM(2) Complied the software of SEEP2, which is a program based on the two dimension saturate theory. And complied the pro process program use compute language VC6.0, the pro process program can read the data file of DXF format;(3) Analysis the difference of seepage field between saturate and saturate-unsaturated theory.The main achievements of the thesis is, compiled the program of SEEP2, which is a two dimension calculate program of saturate seepage for embankment, and compiled the pro process program for SEEP2, the program can read the data file of DXF format.Through the calculation of some project and the contrast with PALXIS, it reveals that the computing result by SEEP2 is reliable and with reason. Through the contrast calculation of saturate with saturate-unsaturated, we can know that water conductivity is a key parameter in the calculation of unsteady saturate seepage, and the free surface line of saturate-unsaturated seepage theory is lower in the upstream side and is higher in the downstream side than saturate. When the water level is falling, the free surface line of saturate theory is lower than saturate-unsaturated.更多还原