Influence of Blasting Vibrations Generated by Tunnel Construction on an Existing Road
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RESEARCH PAPER
Influence of Blasting Vibrations Generated by Tunnel Construction on an Existing Road Xianghui Deng1 • Jingyuan Wang1 • Rui Wang1 • Qin Liu2 Received: 1 March 2020 / Revised: 5 July 2020 / Accepted: 9 July 2020 Ó Iran University of Science and Technology 2020
Abstract Tunnel excavations are commonly carried out using the drill and blast method, which may cause blast-induced damage to adjacent buildings. Peak particle velocity (PPV) is a widely used parameter for evaluating the damage of blasting vibration. However, accurately predicting PPV is difficult with traditional empirical predicting methods because their results are often different from actual conditions. In this study, attenuation formula of propagation velocity of elastic stress waves in elastomer is derived on the basis of stress wave theory. Moreover, the formula for predicting PPV is modified in the case of multihole and multistage blasting and then applied to Guanlinzi Tunnel, which downtraverses through National Highway 316. Results show that the modified formula obtains a small relative error between predicted and in situ monitoring PPVs and can properly reflect the propagation law of PPV under the condition of multihole and multistage blasting. This work has important application prospects and can provide a reference for similar excavation blasting and vibration control methods. Keywords Shallow tunnel Downtraversing Existing road Blasting vibration Peak particle velocity Field test
1 Introduction The rapid development of traffic engineering has resulted in the remarkable growth of underground space utilization. Given the intensiveness of buildings, new tunnels will inevitably be constructed adjacent to existing buildings. New tunnels downtraverse existing roads in many cases because of the constraints of terrain and environmental and engineering geological conditions. Blasting vibration & Rui Wang [email protected] Xianghui Deng [email protected] Jingyuan Wang [email protected] Qin Liu [email protected] 1
School of Civil and Architecture Engineering, Xi’an Technological University, Xi’an 710021, China
2
School of Civil Engineering, Chang’an University, Xi’an 710048, China
during construction may damage the existing roads and endanger the safety of construction sites [1–3]. Therefore, evaluating the dynamic responses of existing roads subjected to blasting vibration and guaranteeing their safety during construction are necessary. Many scholars have explored the influences of blasting vibration on existing structures through field experiments and numerical simulations. Yao et al. [4] numerically simulated the insufficient distance between the left and right lines in the excavation of Dong Jiashan Tunnel; the results of the study showed that construction blasting significantly influenced the constructed tunnel and the excavation of the upper and lower steps is conducive for the control of peak particle velocity (PPV). Through an overview of the blasting process an
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