Dynamic Disturbance Effects of Proposed Tunnel Blasting on Adjacent Existing Tunnels: a Pre-Assessment Case Study

DOI

10.2991/978-94-6463-449-5_17How to use a DOI?

Keywords

proposed metro; dynamic characteristics; vibration velocity; dominant frequency

Abstract

The construction process of the proposed tunnel will have a disruptive impact on the safe operation of adjacent subways. Therefore, taking the parallel section of the proposed Metro Line 6 and the existing Metro Line 10 in Chongqing as the research object, the geological conditions and the mechanical properties of the surrounding rocks are obtained through geological investigations and tests. Subsequently, a blasting scheme was designed for the blasting construction of the proposed tunnel, and the stress state and vibration distribution law of the existing subway lining were analyzed through simulation. Immediately afterwards, the adaptive optimal kernel spectrum method (AOK) is introduced to analyse the principal frequency characteristics of each section. The results show that the proposed underground excavation will cause additional stress on the lining structure and structure deformation, but the displacement, displacement increments and stress are within safe limits. The blast velocities in the arch and bottom of the existing tunnel are higher than those in other locations, while the arch velocity decreases with increasing distance, and the bottom velocity remains at a high level. The settlement and stress of Line 10 second lining are within the safe range.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Fei Lin
AU  - Zhigang Zhang
AU  - Jinhua Chen
AU  - Longhao Ma
AU  - Xiaohong Zhou
PY  - 2024
DA  - 2024/06/30
TI  - Dynamic Disturbance Effects of Proposed Tunnel Blasting on Adjacent Existing Tunnels: a Pre-Assessment Case Study
BT  - Proceedings of the 2024 8th International Conference on Civil Architecture and Structural Engineering (ICCASE 2024)
PB  - Atlantis Press
SP  - 173
EP  - 180
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-449-5_17
DO  - 10.2991/978-94-6463-449-5_17
ID  - Lin2024
ER  -