Influence of blasting vibration of Guanlinzi tunnel on the existing down-traversing road

Abstract

Abstract: In blasting construction of a new tunneldowntraversing the existing road, vibrations produced by the blasting are very easy to cause damage to upper pavement structure or even failure of the structure. Taking the new Guanlinzi Tunnel of Bao-Han Highway as an example, the finite element method is used to simulate the peak vibration velocity, pavement stress and pavement displacement of ten key points of the pavement. Combined with monitoring results taking from on-site blasting vibration and vibration velocity, the influence of blasting vibration on the existing road is compared and analyzed in this paper. The main research conclusions are as follows:the peak blasting velocity of the ten key points occurs during cut blasting. Both the road surface stress and the road surface displacement of the existing road are small, which is not enough to cause damage of the existing road.According to results of our numerical simulation and field tests, the existing road safety can be ensured when the peak value of combined velocity caused by vibrations on upper pavement surface of the underpass is less than 0.035 m/s.

Key words: the Guanlinzi tunnel, down-traversing, existing road, peak particle velocity, numerical simulation, field test

CLC Number:

TU312
U455.6

DENG Xiang-hui, XIA Dao-hong, WANG Rui, ZHANG Yong-jie. Influence of blasting vibration of Guanlinzi tunnel on the existing down-traversing road[J]. Journal of Lanzhou University of Technology, 2020, 46(6): 119-124.

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