Comparison and discussion for Biot theory and modified Biot one
LIU Zhi-jun;XIA Tang-dai;HUANG Rui;CHEN Wei-yun;MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University;Research Center of Costal and Urban Geotechnical Engineering,Zhejiang University;College of Transportation Science & Engineering,Nanjing University of Technology;
The wave equations of Biot theory and modified Biot one were derived,and the dimension and correct definition of each parameter in the equations were clearly indicated. Based on the modified Biot theory,three different forms of wave equations were derived as well. Then,by comparing those two theories,the expressions of Biot elastic coefficients were obtained,and the stresses of the two theories and their correspondences were analyzed. Finally,particularly,the positive direction and meaning of pore-fluid pressure sign and the definitions of part parameters in the fundamental equations were discussed to be helpful for understanding and using the two theories.