New artificial boundary condition for saturated soil foundations |
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Authors: | Qiang Xu Jianyun Chen Jing Li Shuli Fan |
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Institution: | 2. School of Civil and Hydraulic Eng., Dalian University of Technology, Dalian, 116023, China 1. State Key Lab. of Coastal and Offshore Eng., Dalian University of Technology, Dalian, 116023, China
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Abstract: | A new artificial boundary model based on multi-directional transmitting and viscous-spring artificial boundary theories is
proposed to absorb stress waves in a saturated soil foundation in dynamic analysis. Since shear waves (S-waves) are the same
in a saturated soil foundation and a single-phase medium foundation, a tangential visco-elastic boundary condition for a single-phase
medium foundation can also be used for saturated soil foundations. Thus, the purpose of the artificial boundary proposed in
this paper is primarily to absorb two types of P-waves in a saturated soil foundation. The main idea is that the stress of
the P-waves in the saturated soil foundation is decomposed into two types. The first type of stress, σ
ra
, is absorbed by the first artificial boundary. The second type of stress, σ
rb
, is balanced by the stress generated by the second artificial boundary. Ultimately, both types of P-waves (fast-P-waves and
slow-P-waves) are absorbed by the artificial boundary model proposed in this paper. In particular, note that the fast-P-waves
and slow-P-waves are absorbed at the position of the first boundary. Thus, the artificial boundary model proposed herein can
simultaneously absorb P-fast waves, P-slow waves and shear waves. Finally, a numerical example is given to examine the proposed
artificial boundary model, and the results show that it is very accurate. |
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Keywords: | multi-directional transmitting artificial boundary viscous-spring artificial boundary saturated soil foundation Biot's equations |
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