Impact of Blasting Construction of Tunnel Crossing Expressway

Abstract

In this study, we monitored the blasting process for constructing a water-conveying tunnel under an expressway and analyzed the dynamic response of the existing structures along the road resulting from the blasting process. The vibration comfort index of adjacent structures was evaluated. The results show that the amplitude of the vibration velocity of existing structures along the line resulting from the blasting process ranges from 0.4 to 71.8 mm/s, and the amplitude of the vibration frequency ranges from 22.7 to 166.7 Hz. More attention should be paid to structures with natural vibration frequency in this range. The maximum vibration velocity of the measuring points on the shoulder of the expressway and near rural roads was recorded in the vertical direction, whereas that of the measuring points on the slope protection and dam mainly appeared in the horizontal direction. The effect of vibration in different directions should be considered in different construction structures. The deformation of expressway pavement, slope protection, and reservoir dam caused by the blasting process is small, which meets the safety requirements. DIN4150-2 can be used for vibration comfort control in blasting construction, but the vibration comfort index determined by DIN4150-2 is inconsistent with personnel’s perception of horizontal vibration comfort. Therefore, it is necessary to further quantify the comfort evaluation index of adjacent structures in the tunnel blasting process.