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Influence of blasting disturbance on dynamic response and safety of deep tunnels

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Geomechanics and Geophysics for Geo-Energy and Geo-Resources Aims and scope Submit manuscript

Abstract

Numerical simulations were performed using a 2D particle flow code (PFC2D) to study the dynamic behavior of two deep buried tunnels subjected to blasting disturbance. Depending on the distances between the two tunnels and blasthole, the two tunnels were divided into adjacent tunnels and nonadjacent tunnels, respectively. The propagation characteristics of the blasting stress wave were first examined. The evolution of strain energy around the two deep buried tunnels was then evaluated. The results show that at different locations around the tunnels, the variation characteristics of strain energy are different. Moreover, in the region where the strain energy accumulates, the safety factor decreases, while in the region where the strain energy releases, the safety factor increases. The effects of tunnel spacing and tunnel shape on the nonadjacent tunnel were further investigated. For the nonadjacent tunnel, the safety factor at the left and right sidewalls is positively related to the tunnel spacing, while the safety factor at the roof tends to increase first and then decrease. When the tunnel shape subsequently changes from circular to U-shaped and rectangular, the safety at the right sidewall and roof show the trend of decreasing and increasing respectively, and the safety factor at the left sidewall decreases first and then increases.

Article highlights

  • The stress evolution characteristics are closely related to the location of surrounding rock.

  • The tunnel setting is closely related to the stability of non-adjacent tunnel.

  • The variation of strain energy is negatively correlated with the variation of the safety factor of tunnel.

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Acknowledgements

We acknowledge the financial supports of the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (2019ZT08G315), the China postdoctoral science foundation (2020M682881 and 2021T140473), and the Guangdong basic and applied basic research fund (No. 2020A1515110468).

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Authors and Affiliations

  1. Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, China

    Jiadong Qiu & Fei Wang

  2. School of Civil Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China

    Kai Liu

  3. School of Resources and Safety Engineering, Central South University, Changsha, 410083, Hunan, China

    Xibing Li & Diyuan Li

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  1. Jiadong Qiu
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  2. Kai Liu
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  3. Xibing Li
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  4. Diyuan Li
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  5. Fei Wang
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Correspondence to Kai Liu.

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Qiu, J., Liu, K., Li, X. et al. Influence of blasting disturbance on dynamic response and safety of deep tunnels. Geomech. Geophys. Geo-energ. Geo-resour. 8, 5 (2022). https://doi.org/10.1007/s40948-021-00308-8

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  • DOI: https://doi.org/10.1007/s40948-021-00308-8

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