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

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

Authors :
Wang, Xiaofei
Hu, Shaobin
Wang, Enyuan
Source :
KSCE Journal of Civil Engineering; Nov2023, Vol. 27 Issue 11, p4787-4797, 11p
Publication Year :
2023

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
12267988
Volume :
27
Issue :
11
Database :
Complementary Index
Journal :
KSCE Journal of Civil Engineering
Publication Type :
Academic Journal
Accession number :
173050029
Full Text :
https://doi.org/10.1007/s12205-023-1732-2