No abstract

In this study, we investigated the vibration propagation characteristics in ground caused by the explosion pressures during ground and underground blasting. In addition, the use of Styrofoam as a simulation medium, which represents the void during underground blasting, was investigated.Methods. The investigation method is the measuring and comparing the vibrations using variable trinitrotoluene (TNT) charge amounts and underground volumetric spaces.Findings. The regression analysis results based on experimental calculations indicated that the vibration levels were lower and vibration attenuation occurred more rapidly during underground blasting than those during ground blasting.Originality. As the underground volumetric space increased, the vibration levels lowered and vibration attenuation became more gradual.Practical implications. The use of Styrofoam to simulate the void in the underground space during blasting was deemed inappropriate, however, Styrofoam may be appropriate as a medium for low-impedance grounds.