Abstract
In this study, to mitigate blast wave in a specific direction, additional high walls were installed over a standard blast wall and their blast mitigation performances were experimentally investigated. A blast wave generated by an explosion of 1.00 g pentaerythritol tetranitrate pellets was measured by pressure transducers mounted on a steel plate simulating the ground surface. An I-shaped wall and rectangular C-shaped walls, which had lateral components, were used as the additional walls. The walls were made of steel plates in order to avoid deformation. As compared to the I-shaped wall, the C-shaped wall reduced the peak overpressure more behind the wall near the explosion point; however, it intensified the blast wave more on the opposite side of the wall. When the C-shaped wall was distanced from the explosive, the blast pressure behind the wall was mitigated for the entire distance, and the pressure increment on the opposite side caused by the reflected shock wave was suppressed. The results indicated that the high C-shaped wall additionally placed far from the explosive was effective in protecting objects in the specific direction from the blast wave.
