【作者】 陈亮亮；

【导师】 李永； 侍克斌；

【作者基本信息】 新疆农业大学 ， 农业水土工程， 2008， 硕士

【摘要】 在土石坝的研究中，土石坝的安全问题一直是人们追逐的热点，而坝基的渗流稳定又是影响土石坝安全的主要问题之一。所以，土石坝坝基的渗流安全问题愈来愈引起坝工领域的关注。我国的水库大坝中有相当大的部分为土石坝，从现有的坝基防渗控制理论来看，还没有较成熟和完善的针对无限深透水地基上的坝基渗流控制计算理论。在讨论无限深透水地基上土石坝的坝基渗流控制问题时，本文利用直接边界元法进行分析和讨论，进而建立数学模型进行计算。采用直接边界元法解决该问题的难度主要在于：当进行水平铺盖防渗计算时，无限深透水地基的部分边界难以确定。本文根据直接边界元法的基本原理，假设从坝基以下的某一深度找到一条边界，当以该边界为模型算出的值与实测值相比很接近时，可近似认为所假设的边界就是其实际边界。同时，本文还用直接边界元法对无限深透水地基上土石坝水平铺盖长度对渗流的影响进行分析。本文在最后部分，对求解渗流问题的三种数值方法有限单元法、直接边界元法和边界点法的优缺点进行了有益的探讨。更多还原

【Abstract】 In earth-rock dams research, the security of earth-rock dams is always the hot topic andthe seepage is the most important influence factor in all factors resulting in earth-rock damsdestruction. Therefore seepage problem of earth-rock dam arouses focus of the damengineering field attation increasingly. The earth-rock dam is the main part of thr country’sreservoir dam.The existing seepage control theories to infinite deep pervious foundation arenot maturity and perfect.At discussing the seepage control on infinite deep pervious foundation.This paper makesuse of direct boundary element method on discussing the seepage control of dam foundation,and build up mathematics model.The difficult of the problem arise the part of boundary zoneto simulate with difficulty,while slving horizontal impervious blanket seepage controlproblem.According to basic principle of direct boundary element method,this paper proposethat we can find out one boundary zone under the basi of the dam. When figures out the valuethat take this boundary as the model and the actual value compare approaches very muchtime.In the meantime we will discuss the influence of impervious blanket’s length forearth-rock’s seepage on infinite deep pervious foundation. At the end of this paper,wediscussing advantage and fault of three method that caclculate seepage problem: finiteelement method ,direct boundary element method,boundary point method.更多还原