To build a protective design of buried structures, the ground shock loading should be predicted. However, ground shock propagation in earth media may be a complex function of the dynamic properties of the soil. In this study, small-scale indoor tests of underground explosion were conducted with the different degree of saturation of soil. And, shock pressure due to explosion in soil was measured at the distances of 40cm, 65cm and 80cm, respectively, by a subminiature pressure transducer. The results showed that the pressure became higher with the increase of soil saturation and the attenuation of ground shock depends on the distance from charge. Based on test results, the approximation methods of estimating the ground shock properties (e.g., the peak pressure, the duration time of positive phase and the impulse) were formulated.
