【作者】 鹿群；

【导师】 王成华；

【作者基本信息】 天津大学 ， 结构工程， 2004， 硕士

【摘要】 渗透破坏和与渗透有关的险情是江河堤防在洪水期间的主要破坏形式。研究堤防的渗流情况，特别是在汛期的情况，对于正确评价堤防的安全性、预测渗透破坏发生的形式和具体位置、对堤防的加固进行科学的指导等，有重要的理论和实际意义。在堤防、土坝等有自由面的渗流分析中，由于自由面的位置在计算前是未知的，因此渗流域的求解是一个非线性迭代的过程。本文采用了目前较为先进的初流量法和求解流量补给矩阵的方法，在过去的基坑渗流场三维有限元分析程序的基础上，编制了土坝非稳定渗流场三维有限元程序 SEEP3D。通过土坝渗流场的三维非稳定分析，以期达到对土坝渗流场实际复杂情况的模拟，比较理想地反映不同时段的土坝渗流场中等势线、流速矢量、无压渗流场自由面以及流量等渗流要素在不同条件下的变化规律，从而在一定程度上弥补过去对土坝渗流场研究的不足.同时，SEEP3D 对基坑等同样适用,可为其防水与降水方案设计提供一定的理论依据。更多还原

【Abstract】 Seepage failure and other failures related with seepage are the main forms offailures in the flood embankment of rivers during the flood period. In oder to evaluatethe safety of embankment, predict the form and location of the failure and give thescientific instruction of reinforcement of the dyke, it is of great theoretical andpractical importance to study the seepage status of the embankment during the floodperiod. Because the free surface boundary is unknown in the seepage analysis of floodembankment and earth dam, the analysis is a non-linear iteration process. On the basisof 3-D Finite Element Analyses of seepage fields in foundation pits, adopting theinitial flow method and the flux supply matrix, this paper conducts a series of 3-DFinite Element Analyses of the unsteady seepage fields of earth dam, with a newlycoded Fortran programme named SEEP3D. In this way, the simulation of actualseepage fields in complicated site and construction conditions were made in order tohave a deep view of the general rules of seepages in earth dam, and illuminate laws ofmain physical quantities. At the meanwhile, this programme can also be applied to thedesign and construction of foundation pits, and, based on which, more feasible andeconomic measures can be adopted .更多还原