Research on micro vibration key technology of fine blasting for metro tunnels in urban complex environment
With the continuous development of urban underground space,the selection of metro lines,stations,and entrances and exits is increasingly confined by land space.The metro blasting construction in urban complex environment will inevitably have a certain impact on the surrounding sensitive buildings(structures)to a certain extent.Poor control can easily lead to unstable factors,and there is an urgent need to adopt a low vibration,efficient,and environmentally friendly blasting technology.This article relies on the fine blasting construction of the weathered rock layer deep buried and hidden excavation large cross-section station in Chongqing metro,focuses on the analysis and verification of blasting parameter selection and delay preference based on the surrounding environment,applies the vibration velocity monitoring platform and the stress monitoring platform,and refines the supervision means to find the vibration attenuation coefficient regression adapted to the blasting site conditions,so as to achieve the purpose of micro-vibratory blasting and green environmental protection construction.The relevant research could provide reference and inspiration for other similar metro tunnel blasting projects.
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