UMERICAL ANALYSIS OF THE IMPACT OF EXCAVATION BLASTING ON THE FUDAO SCENIC AREA IN A SUPER SHALLOW BURIED SUPER LARGE SECTION SMALL CLEAR DISTANCE TUNNEL
The construction of ultra shallow buried tunnels can easily affect the surface and adjacent buildings.A super large section small clearance tunnel in Fuzhou passes through an urban scenic area,adjacent to a steel truss overhead bridge and forest walkway in the scenic area.How to avoid the significant impact of excavation and blasting construction on scenic areas and sensitive buildings is an urgent problem to be solved in engineering construction.A simplified model of Fudao steel truss bridge was established using midas GTS software,and the impact of tunnel excavation blasting construction on the surface of the scenic area and the steel truss bridge was simulated and compared with on-site measurements.The calculation analysis shows that under the recommended blasting scheme:(1)The particle vibration velocity rapidly decays when close to the blasting center,but the attenuation amplitude slows down when far away from the blasting center;(2)The maximum vibration speed of the surface and Fudao steel truss bridge deck in the scenic area can meet the blasting vibration speed control standards;(3)The impact of blasting construction on the scenic area is minimal,providing a basis and guidance for the design and construction of the project.
small clearance tunnelblastingnumerical simulationvibration velocity
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