Abstract
The effects of tunnel blast excavation on the adjacent existing high-voltage tower are comprehensively studied for the Chashan highway tunnel project as a case study. To investigate the effect of blast-induced vibration from the tunnel on the adjacent existing tower, field tests and numerical simulations method were adopted to study the vibration velocity and vibration frequency of the existing tower. Moreover, the relationship between the transverse distance from the detonation center and the peak velocity is discussed in detail. The results showed that the peak velocity of the measuring point in tower foundation increases with the distance between the detonation center and tower foundation approaches, and the maximum velocity is appearing when detonation center is 0 m. Furthermore, the corresponding energy spectrum distributions of the existing tower under the effect of blast induced by vibration is also analyzed, and the main frequency of vertical vibration is generally higher than that of transverse vibration. On combining the peak velocity with the main frequency and the natural frequency of the tower, the safety evaluation of the blasting area is proposed, and the corresponding control measures of blasting vibration are put forward. A guideline for the blast safety zone is proposed based on vibration velocity, main frequency, and the quantity of explosive.
Highlights
Tunnels play an important role in the transportation infrastructure of mountain areas and bring convenience to people’s lives [1,2,3,4,5,6,7]
The high-voltage tower is a high-rise structure, which is very sensitive to tilt deformation and uneven settlement of foundation, and the failure of key components will result in the collapse of the structure under vibration [17, 18]. e uneven settlement of the high-voltage tower foundation is caused by tunnel blasting, which may lead to paralysis of the power supply system, huge economic losses, and even causing serious consequences such as fire. erefore, it is crucial to reduce the influence of blasting on the high-voltage tower and ensure that the safety of the high-voltage tower in the process of tunnel blasting excavation
When the detonation distance is 0 m, the maximum vibration velocity was 2.358 cm/s in measuring point D, which is close to the safety control standard of 2.5 cm/s. erefore, for eliminating potential safety hazards as early as possible and preventing the collapse of the tower, the monitoring of the tower foundation should be strengthened and the blasting charge should be reduced during the blasting construction
Summary
Tunnels play an important role in the transportation infrastructure of mountain areas and bring convenience to people’s lives [1,2,3,4,5,6,7]. For shallow-buried tunnels, surface vibration caused by drilling and blasting is relatively large to reduce the impact of blasting on surrounding buildings, and ground vibration caused by blasting in the process of tunnel construction should be reasonably controlled. Limited by the geological condition of mountain areas and economic factors, it is difficult to build tunnel far away from high-voltage towers. E uneven settlement of the high-voltage tower foundation is caused by tunnel blasting, which may lead to paralysis of the power supply system, huge economic losses, and even causing serious consequences such as fire. Erefore, it is crucial to reduce the influence of blasting on the high-voltage tower and ensure that the safety of the high-voltage tower in the process of tunnel blasting excavation The high-voltage tower is a high-rise structure, which is very sensitive to tilt deformation and uneven settlement of foundation, and the failure of key components will result in the collapse of the structure under vibration [17, 18]. e uneven settlement of the high-voltage tower foundation is caused by tunnel blasting, which may lead to paralysis of the power supply system, huge economic losses, and even causing serious consequences such as fire. erefore, it is crucial to reduce the influence of blasting on the high-voltage tower and ensure that the safety of the high-voltage tower in the process of tunnel blasting excavation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
