<FONT face=Verdana>地下工程抗震分析中地震动输入方法研究</FONT>

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Abstract A new earthquake input method based on infinite element dynamic artificial boundary is proposed. In this new method，radiation damping of the strata and reflection，scattering of the seismic wave in the strata are both considered；and equivalent earthquake load formulae in different boundary surfaces for seismic waves vertically incident from the bottom of computational domain are deduced by using the wave field separation method. Meanwhile，a numerical example is given to verify the validity and accuracy of the method. The results show that the distortional disturbance appears in the result adopting fixed boundary，whereas the results using the method proposed tally with the results using analytical method well so as to prove the effectiveness of the presented method. At last，the new earthquake input method is applied to the three-dimensional aseismic analysis of Galongla tunnel，and some meaningful conclusions are drawn.

Key words： underground engineering aseismic analysis earthquake input method infinite element dynamic artificial boundary radiation damping wave field separation method

Received: 15 January 2010

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http://www.rockmech.org/EN/ OR http://www.rockmech.org/EN/Y2010/V29/I06/1254