有限元地震数值模拟中无限元边界的应用  

The Application of Infinite Element Boundaries to the Numerical Simulation of Finite Element Earthquake

作　　者：李志[1] 薛霆虓[1,2] 张海亮 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]桂林理工大学广西地质工程中心区重点实验室,广西桂林541004 [3]中化地质矿山总局山东地质勘查院,山东济南250013

出　　处：《工程地球物理学报》2016年第1期35-40,共6页Chinese Journal of Engineering Geophysics

基　　金：桂林理工大学科研启动项目(编号:002401003302)

摘　　要：在用有限元做地震数值模拟中,对于研究无限区域的问题,需要在模型的边界上采用一定的边界条件,其他方法设置边界条件较为困难,而利用无限元方法,可以比较有效地设计吸收边界,编程也较为方便。本文设计了一些简单的模型,利用有限元方法进行模拟,在边界处设计了无限元,并得到了地震快照和人工地震记录。分析对比结果可以明显地看出,在使用无限元的方法后模型边界的影响几乎被消除,且适用于复杂地形。在解决无限域的问题上使用无限元能更真实地模拟地震波传播过程。When the finite element method is used to research the numerical simulation of the earthquake, certain boundary conditions are need to apllied to the boundary of the model as for the problems in researching infinite zone. Other methods are more difficult to set up boundary conditions, but using the infinite element method can be more effective to design the absorbing boundary and programming is also more convenient. In this paper, some simple models are designed, the finite element method is used to simulate the model, and the infinite element is designed in the boundary of the model. Then the earthquake snapshot and the artificial earthquake record are obtained. The results of the analysis clearly show that the influence of the boundary of the model is almost eliminated after using the infinite element method, and it can also be used in complex terrain. In solving the problem of infi nite domain, infinite element can truly simulate seismic wave propagation process.

关 键 词：地震数值模拟 有限元 无限元 

分 类 号：P631.4[天文地球—地质矿产勘探]