Journal of South China University of Technology (Natural Science Edition) ›› 2019, Vol. 47 ›› Issue (11): 140-146.doi: 10.12141/j.issn.1000-565X.180628

• Architecture & Civil Engineering • Previous Articles    

Study on the External Excitation Input Methods for Porous Medium

HU Dan1 ZHANG Kaiyin1 SUN Liang1,3 LI Fen1 ZHANG Lei2   

  1. 1． School of Transportation，Wuhan University of Technology，Wuhan 430063，Hubei，China; 2． School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan 430063，Hubei，China; 3． State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116024，Liaoning，China
  • Received:2018-12-19 Revised:2019-06-25 Online:2019-11-25 Published:2019-10-02
  • Contact: 李芬(1974-)，女，副教授，主要从事桩—土相互作用的研究． E-mail:jessilifen@126.com
  • About author:胡丹(1989-)，女，博士，主要从事桩–饱和土动力相互作用的研究． E-mail:hudan1989．happy@163．com
  • Supported by:
    Supported by the National Natural Science Foundation for Young Scholars( 51808421)

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Abstract: The numerical methods have been widely used to solve the structure-foundation interaction problems in which the semi-infinite medium simulation and the external excitation input method are of most concern． The com- monly used external excitation input methods include the wave method，the artificial boundary substructure method and the domain reduction method ( DＲM) ，etc． Firstly，the applicability of different wave input methods for single- phase media e are compared by virtue of FLAC3D and Matlab，and the results show that the free field response ob- tained by the DＲM method match well with the one-dimensional analytical solution． Further，the artificial boundary substructure method and DＲM method are applied to porous medium，respectively，and the formula to transfer ex- ternal excitation into equivalent force and equivalent discharge are proposed． Finally，the feasibility of two methods are compared and verified with the elastic semi-infinite saturated foundation response under the effect of vertical seismic wave． The results indicate that the free field response value obtained by the DＲM method is consistent with the one-dimensional analytical solution，however，the response value obtained by the artificial boundary substruc- ture method is much smaller．

Key words: saturated porous medium, artificial boundary substructure method, domain reduction method, external excitation input method