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首页> 美国政府科技报告 >Development of Strain Based Vibration Controls to Lower Costs of Constructing Transportation Facilities in Dense Urban Locations.
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Development of Strain Based Vibration Controls to Lower Costs of Constructing Transportation Facilities in Dense Urban Locations.

机译：基于应变的振动控制技术的发展，降低城市交通枢纽建设成本。

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In 2012 New York City agencies are fragmenting by blasting large volumes of rock to construct transit facilities in close proximity to existing facilities. Transit projects with a total cost exceeding 17 Billion dollars are currently underway in Manhattan. Since all of these projects involve tunnels, shafts and escalator inclines in rock, rock excavation costs are a significant cost factor. This work relates to protection of existing structures from external loads and improving construction efficiency and safety. Primary hazards associated with blasting adjacent, contiguous and within structures include permanent rock mass displacement owing to delayed gas pressures ground strains from wave propagation as well as vibratory response. Existing methodology is often applied quite conservatively in the form of permissible ground particle velocity which leads to confusing specifications and increased construction costs.

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