Abstract
Experimental and numerical research of the effect of blasting vibrations during tunneling on surrounding structures (rock mass, existing tunnels, buildings, etc.) was widely studied in recent years. However, the effect of blasting vibration from a new tunnel on an existing adjacent tunnel is still unclear. A few researches has been carried out to study the relationship of the observed Peak Particle Velocity (PPV) on the lining areas along the existing tunnel direction, due to either the lack of in situ test data or the difficulty in conducting field tests, particularly for tunnels that are usually old and vulnerable after several decades of service. The paper uses the synthetic analysis method, study result of Croix-Rousse, Lyon, France to propose on assessing the effects of blasting vibration on the existing lining of the main tunnel during expanding excavation the auxiliary tunnel by drilling and blasting method in similar conditions at Hai Van Pass Tunnel in Viet Nam .
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