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本文给出三维十二结点无界元和十结点节理无界元模型及其整套算式,并结合算例,讨论了在这种单元应用中的有关问题,例如衰减函数、衰减中心等等。 在无限域或半无限域岩土工程问题的有限元分析中,纳入无界元、节理无界元这类特殊单元,只要截取有限,甚至很小的计算范围,就能满足计算精度要求和符合无穷远处位移为零的边界条件。因此,这就为岩土工程通常的有限元分析中“计算范围、边界条件不易确定”的困难提供了一种有效的解决手段,而且它在提高计算精度和经济效益方而均有明显的优越性。
In this paper, the jointless unbounded element model and its complete set of three-dimensional twelve-node unbounded element and ten-junction joints are given. Combined with examples, the related problems in the application of this element are discussed, such as attenuation function, attenuation center and so on. In finite element analysis of geotechnical problems in the infinite domain or semi-infinite domain, special units such as unbounded elements and jointless unbounded elements are included. As long as the limited or even small calculation range is intercepted, the calculation accuracy requirements and the infinity can be met. The zero displacement boundary condition. Therefore, this provides an effective solution for the difficulty of “calculation range, boundary conditions are not easy to determine” in the finite element analysis of geotechnical engineering, and it has obvious advantages in improving the calculation accuracy and economic efficiency. Sex.