Next Article in Journal
A Fast Ray-tracing Method for Locating Mining-Induced Seismicity by Considering Underground Voids
Previous Article in Journal
A Novel Approach to Shadow Boundary Detection Based on an Adaptive Direction-Tracking Filter for Brain-Machine Interface Applications
Open AccessArticle

A New Technology for Smooth Blasting without Detonating Cord for Rock Tunnel Excavation

1
School of Resources and Safety Engineering, Central South University, Changsha 410083, China
2
Advanced Research Center, Central South University, Changsha 410083, China
3
School of Civil Engineering, Central South University, Changsha 410075, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(19), 6764; https://doi.org/10.3390/app10196764
Received: 6 September 2020 / Revised: 18 September 2020 / Accepted: 25 September 2020 / Published: 27 September 2020
(This article belongs to the Section Civil Engineering)
In this paper, the aim is to achieve safe, rapid excavation of an extra-long, large-cross-section highway tunnel in Eastern Tianshan, as well as to reduce production costs, simplify production processes, reduce cycle time, and improve production efficiency. In this study, we explored a new technology for smooth blasting without a detonating cord. A series of sympathetic detonation experiments were conducted in the tunnel face to determine critical distances. The critical distance for No. 2 rock emulsion explosive under blasthole constraints was successfully measured to be approximately 1.0–1.1 m. Based on the critical distance, a new charging structure was designed for tunnel excavation. To assess the influence of the new charging structure on blasting performance, its economic benefits, and its feasibility, full-section tests were performed in the East Tianshan Tunnel. The application of the new charging structure produced good smooth blasting results. It not only simplified the charging process and produced smooth blasting without detonating cord in peripheral holes, but also guaranteed normal excavation, an appropriate tunnel profile, and reasonable overbreak and underbreak volumes. This had remarkable economic benefits and possesses better promotional value. View Full-Text
Keywords: rock tunnel excavation; smooth blasting; sympathetic detonation; critical distance; new charging structure; no detonating cord rock tunnel excavation; smooth blasting; sympathetic detonation; critical distance; new charging structure; no detonating cord
Show Figures

Figure 1

MDPI and ACS Style

Ma, C.; Xie, W.; Liu, Z.; Li, Q.; Xu, J.; Tan, G. A New Technology for Smooth Blasting without Detonating Cord for Rock Tunnel Excavation. Appl. Sci. 2020, 10, 6764.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop