›› 2004, Vol. 25 ›› Issue (3): 354-358.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Characteristics of wave propagation in unsaturated soils

XU Chang-jie1，SHI Yan-yong2   

  1. 1. Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China； 2. Architecture Design Institute of Zhoushan, Zhoushan 316000, China
  • Received:2002-12-30 Online:2004-03-10 Published:2014-07-15

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Abstract: Based on the wave propagation equation in unsaturated soils, four kinds of waves (i.e., one is S wave, and other three are P waves, P1 wave, P2 wave and P3 wave according to the wave velocity) are found in unsaturated soils through theoretic deduction. Analytic expressions for wave velocity and attenuation are proposed. Numerical analysis about the relations between the wave velocity ,attenuation and the frequency, saturation degree is carried out. The results show that the velocity of P3 is minimum and the attenuation of it is maximum, the velocity of P1 is maximum and the attenuation of it is minimum, and the velocity and attenuation of . P2 are between other two waves. All four kinds of waves are dissipative waves. In general case, the velocity becomes slower with the the frequency heightening, and the attenuation becomes greater. With the gas content becoming higher, the velocity of P1 becomes lower and velocity of P2 and S becomes higher, the velocity of P3 is not affected by gas content very much, the attenuation of P1 wave and P3 wave become less, but not very much. The attenuation of P2 wave is not varied with the change of gas content basically and the attenuation of S wave is very small.

Key words: unsaturated soils, wave propagation, theory of mixture

CLC Number: 

  • TU 411
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