Effect of Blasting During Tunnel Excavation on an Existing Adjacent Tunnel

Öz

In recent decades, the effects of blast loads on existing structures have gained considerable attention due to the increase in threat from various activities. Site-specific empirical relationships for calculation of blast-induced vibration parameters like Peak Particle Velocity (PPV), Peak Particle Acceleration (PPA), and Peak Particle Displacement (PPD) are commonly used for the estimation of the impact of blasting vibration on an existing adjacent tunnel. However, these relationships are not able to consider the variation in rock parameters and uncertainty of in situ conditions such as modern rock mass classifications (i.e., RMR, Q-system, RQD)... In this paper, a published blast data of various researchers in different rock sites at Croix-Rousse tunnel in France have been collected and used to propose a generalized regression model for PPV by considering the effects of rock parameters like Rock Mass Rating (RMR) system, damping ratio “”, Dynamic Young’s modulus “Ed”. By using the numerical analysis method, the proposed regression model of PPV (Empirical Formula) function of a variable and multivariate can be directly used in the prediction of blast-induced vibrations in rocks.

Anahtar Kelimeler

• PPV
• Blasting vibration
• multivariate equations
• RMR
• Twin tunnels

Kaynakça

1. Clayton, E., Soler, B., Voiron, J.,. Renovation of Croix. Rousse tunnel - Specific points of the technical design. AFTES, page 135. Congrès International, Lyon1, 2011.
2. Vladimir Feldgun el al, . The Effect of an Internal Explosion in a Tunnel on a Neighboring Buried Structure and Free Surface- The 15th International Symposium on Interaction of the Effects of Munitions with Structures (ISIEMS 15), At Potsdam, Germany, 2016.
3. Vo Trong Hung, Dang Van Kien. A new research direction on the impact of the tunnel construction explosion shock on the adjacent tunneling structure. Journal of Mining Industry, Issue No.4, pages 78-84, Hanoi, Vietnam, 2017.
4. J.H. Yanga et al, 2D numerical analysis of rock damage induced by dynamic in-situ stress redistribution and blast loading in underground blasting excavation. Tunneling and Underground Space Technology 70, 221–232, 2017.
5. Zihan Liu et al., Influence of tunnel blasting construction on adjacent highway tunnel: A case study in Wuhan, China. International Journal of Protective Structures. Volume: 11 issue: 3, page(s): 283-303. Crossref DOI link: https://doi.org/10.1177/2041419619888936. September 1, 2020.
6. J.H. Yang et al., 2D numerical analysis of rock damage induced by dynamic in-situ stress redistribution and blast loading in underground blasting excavation. Tunneling and Underground Space Technology Volume 70, Pages 221-232, November 2017.
7. Ao Li et al., Safety Distance of Shotcrete Subjected to Blasting Vibration in Large-Span High-Speed Railway Tunnels., Article ID 2429713, 14 pages. https://doi.org/10.1155/2019/2429713, Shock and Vibration Volume 2019.
8. Dang Van Kien, Vo Trong Hung, Do Ngoc Anh. Studying the effects of blasting shock on the lining structure of adjacent tunnels during tunnel excavation by using the blasting method. Journal of Vietnam Construction. Issue No.7, pages 203-207, Hanoi, Vietnam, 2017.

9. Dang, K.Van. Assessment of the effect of blasting vibration on tunnel lining of Hai Van Pass Tunnel during expanding excavation the auxiliary tunnel by drilling and blasting method (in Vietnamese). Journal of Mining and Earth Sciences. 61, 6 (Dec, 2020), 131-138. DOI:https://doi.org/10.46326/JMES.HTCS2020.18. 2020.
10. Cilsal Murat. The Effect of Geotechnical Factors on Blasting Induced Ground Vibration Particle Velocity. Tunneling and Underground Space Technology 21(3):235-235. May 2006.
11. QCVN 02-2008-BCT. National technical regulation on safety in the process of producing, testing, performing check and acceptance, storage, transportation, use, disposal of industrial explosive materials, and storage of explosive precursors, Viet Nam, 2008.
12. Dang V.K., Dias D., Do N.A., Vo T.H. (2018), Impact of Blasting at Tunnel Face on an Existing Adjacent Tunnel. International Journal of GEOMATE, July 2018 Vol.15, Issue 47, pp.22-31, 2018.
13. Lin Da-neng, (2011), The mitigation negative effect of tunnel-blasting-induced vibrations on existing tunnel and buildings, Journal of coal science & engineering. Pp.28-33, Vol.17 No.1 Mar. 2011.
14. Van Kien Dang, Trong Hung Vo, Ngoc Anh Do, The estimation of the vibration effects caused by tunnel blasts: a case study in the croix-Rousse tunnel, Proceedings of the international conferences on earth sciences and sustainable geo-resources development (ESASGD), ISBN: 978-604-76-1171-3, pp: 339-346, Ha Noi, Viet Nam, 2016.
15. Tran Tuan Minh, Nguyen Quang Huy. Effect of blasting on the stability of lining during excavation of new tunnel near the existing tunnel. Civil Engineering Journal. Vol. 30 No. 1 (2021). https://doi.org/10.14311/CEJ.2021.01.0004, 2021.