Structure Response to Trench and Road Blasting", Proceedings of the 3rd World Conference on Explosives and Blasting, European Federation of Explosives Engineers, Brighton, England

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Crack and structural response to construction trench blasting was measured in a woodframe house with a stucco exterior. Blasts at distances between 232 m to 368 m produced peak particle velocities (PPV) and air blast over pressures (AB) of 9 mm/sec and 0.02 kPa (123 dB), respectively. Structural response velocities were measured at an upper corner and two mid-walls, as were changes in the width of a crack at a window corner in the east midwall. Structure responses were correlated with PPV and AB, which arrived simultaneously, which complicated the distinction between the two. Crack responses were correlated with long-term changes in temperature and humidity as well as PPV and AB. Wall strains from out of plane bending and in-plane shear were computed from upper corner structure response and compared to failure strains for drywall. As has been found in other studies, calculated strains were far lower than those required to crack drywall and environmentally induced crack response from temperature and humidity was far greater than that caused by blast induced ground motion or airblast overpressures.

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