Calculation and analysis of dynamic response of fluid-saturated porous media

The elastic wave equations of fluid-saturated porous media are solved by the time-domain explicit finite element method that consists of explicit step-by-step integral format and local transmitting artificial boundary. Then, the elastic dynamic response of fluid-saturated porous media under input earthquake wave is calculated and analyzed with the method mentioned above. At last, the calculating results of elastic dynamic response of fluid-saturated porous media are compared when the seepage of fluid in the cavity is taken account of or not in order to find out the effect of seepage of fluid in the cavity on the dynamic response property of porous media. Calculating results show that the figures of elastic dynamic response time history of porous media are same as the figures of input earthquake wave; and the time when the peak value of elastic dynamic response appears corresponds to the time when the peak value of input earthquake wave appears. The seepage of fluid in the cavity has a remarkable effect on the elastic dynamic response property of porous media. In the meanwhile, numerical calculations indicate that the time-domain explicit finite element method is effective for the calculation and analysis of the elastic dynamic response of fluid-saturated porous media.