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现阶段使用有限单元法研究复杂地基上的重力坝或空腹重力坝是工程中的有效方法之一.在水库水压力作用下,地基的材料、边界范围及边界条件均将对坝基、坝踵及坝趾等应力产生重大影响.本文探讨了当把地基做为不透水材料时,地基的边界范围及边界条件应如何选取.探讨的方法是使用地基在某些典型荷载作用下理论解同有限元解相对比的方法.对于把地基视做透水材料来研究的情况,本文也讨论了在渗流场作用下,当采取不同的地基范围及边界条件时,地基内应力的变化规律.
At present, using the finite element method to study gravity dams or fasting gravity dams on a complex foundation is one of the effective methods in the project. Under the action of the reservoir water pressure, the foundation material, boundary range and boundary conditions will be applied to the dam foundation, dam dam and Dam toe and other stresses have a significant impact. This article discusses how to select the boundary and boundary conditions of the foundation when the foundation is made of impervious material. The method is to use the foundation to solve the same problem with finite element under some typical loads. The method of solving the contrast ratio. For the study of the foundation as a water-permeable material, this paper also discusses the variation law of the foundation’s internal stress when different foundation ranges and boundary conditions are adopted under the action of the seepage field.