STUDY ON THE BLASTING SEISMIC DAMAGE CONTROL TECHNOLOGY FOR SMALL SPACING SOFT ROCK TUNNEL

Authors

  • Yang Chengzhong School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China
  • Wang Xiaoyu School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China
  • Wang Shufang School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China
  • Chen Wei School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China

DOI:

https://doi.org/10.14311/CEJ.2017.02.0015

Keywords:

Small spacing tunnel, Red layer soft surrounding rock, Blasting damage, optimization, Grouting reinforcement.

Abstract

With a lot construction of transportation infrastructure in Chinese mountainous area, because of its unique advantages such as less land occupation, beautiful appearance and convenient route planning, small spacing tunnels are widely used. The shallow buried tunnel with small spacing, the blasting excavation will lead to tunnel surrounding rock especially in the middle rock wall damage and reduce the self-bearing capacity of surrounding rock. Through detecting and analyzing by the geological radar of the excavated red layer soft rock tunnel surrounding rock found that the middle rock wall loose circle thickness of the tunnel reaches to 1.8 m, the vault and sidewall loose circle thickness is about 1.2 m. Through selection of rational strengthening measures and blasting design scheme to improve drilling parameters and methods, as far as possible to protect the integrity and self-bearing capacity of the surrounding rock, the deformation and vibration of the tunnel would be controlled in reasonable limits and ensure the safety of tunnel construction.

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Published

2017-07-31

How to Cite

Chengzhong, Y., Xiaoyu, W., Shufang, W., & Wei, C. (2017). STUDY ON THE BLASTING SEISMIC DAMAGE CONTROL TECHNOLOGY FOR SMALL SPACING SOFT ROCK TUNNEL. Stavební Obzor - Civil Engineering Journal, 26(2). https://doi.org/10.14311/CEJ.2017.02.0015

Issue

Vol. 26 No. 2 (2017)

Section

Articles

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