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Study on the Safety of Tunnel Structure Vibration in Dry Ice Powder Thermal Shock Rock Breaking

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

The application of explosive blasting for rock breaking works was not possible in densely populated areas, which caused problems in urban tunnel construction. In the application of dry ice powder thermal shock breaking in tunnel excavation, a vibration monitoring system was employed to monitor the vibration response of the tunnel structure during the breaking process, and it was used to extract the signal characteristics by Hilbert-Huang transformation. Experimental results are as follows: 1) The peak vibration speed was below 50 mm/s for concrete structures safe as long as it was farther than 10 m from the burst hole in the support concrete. 2) Aggregate decay of vibration velocities caused by thermal shock breaking of rock with dry ice powder corresponded to the decay law of the power function. The range of influence of the vibration was considerably smaller compared to that of drilling and blasting the rock; 3) The new rock-breaking technology induced damage can be divided into three regions, with radial fractures generated by high-energy fluids dominating. 4) Hilbert Huang transform extracted signal features more objectively and accurately, with excellent reference for the safety monitoring of tunnel structures.

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Acknowledgements

This work is supported by the Key Program of National Natural Science Foundation of China (51934007), the Major Scientific and Technological Innovation Program in Shandong Province (2019JZZY020505) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to Shaobin Hu.

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Wang, X., Hu, S. & Wang, E. Study on the Safety of Tunnel Structure Vibration in Dry Ice Powder Thermal Shock Rock Breaking. KSCE J Civ Eng 27, 4787–4797 (2023). https://doi.org/10.1007/s12205-023-1732-2

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  • DOI: https://doi.org/10.1007/s12205-023-1732-2

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