Strains Induced in Urban Structures by Ultra-High Frequency Blasting Rock Motions: A Case Study
| Autor: | Essaieb Hamdi, C. T. Aimone-Martin, Charles H. Dowding |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
business.industry
Foundation (engineering) Geology 02 engineering and technology Masonry Low frequency Geotechnical Engineering and Engineering Geology Spectral line 020501 mining & metallurgy 020303 mechanical engineering & transports 0205 materials engineering 0203 mechanical engineering Ultra high frequency Particle business Excitation Seismology Civil and Structural Engineering Rock blasting |
| Zdroj: | Rock Mechanics and Rock Engineering. 49:4073-4090 |
| ISSN: | 1434-453X 0723-2632 |
| Popis: | This paper describes measurement and interpretation of strains induced in two, multiple story, older, urban structures by ultra-high frequency rock blast excitation from contiguous excavation. These strains are obtained from relative displacements found by integrating time correlated velocity time histories from multiple positions on the structures and foundation rock. Observations are based on ten instrumented positions on the structures and in the foundation rock during eight blast events, which provided over 70 time histories for analysis. The case study and measurements allowed the following conclusions: despite particle velocities in the rock that greatly exceed regulatory limits, strains in external walls are similar to or lower than those necessary to crack masonry structures and weak wall covering materials. These strains are also lower than those sustained by single story residential structures when excited by low frequency motions with particle velocities below regulatory limits. Expected relative displacements calculated with pseudo velocity single degree of freedom response spectra of excitation motions measured in the rock are similar to those measured. |
| Databáze: | OpenAIRE |
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