Technical Analysis of Collapse in Tunnel Excavation and Suggestion of Preventing Appropriate Applicable Methods (Case Study: Sardasht Dam Second Diversion Tunnel)

Akbar Esmailzadeh, Peyman Jafar Shirzad, Sina Shaffiee Haghshenas

Abstract


In order to either optimal use of water resource of KELAS river basin and electrical energy generation, Sardasht Dam and power plant are designed. Dam water diversion system includes two tunnels with inner diameter of 7 m. Several collapses have occurred in portal of second diversion tunnel (A2) which has created large cavity in tunnel crown. In order to prevent collapse, various ways such as steel sets installation and also grouting to increase strength of surrounded rock mass, are prescribed but none of technics could not to ban caving in. considering this fact that in order to continue tunnelling process, collapse zone should be passed, a solution or solutions must be suggested to overcome consecutive and dangerous collapses problem. In order to decrease tunnelling risks, in this research, using both experience and knowledge obtained from previous proposed executive solution to similar cases and technically analysis of occurred collapse in current diversion tunnel, it has been tried to suggest a new appropriate solution which defeat the problem. Finally, in order to stabilize of tunnel crown, as an effective and applicable solution, constructing retaining crown by means of rock bolts, was introduced.


Keywords


Sardasht Dam and Power Plant; Diversion Tunnel; Technical Analysis; Collapse; Support System.

References


Haghshenas, Sina Shaffiee, Mir Ahmad Lashteh Neshaei, Pouyan Pourkazem, and Sami Shaffiee Haghshenas. "The Risk Assessment of Dam Construction Projects Using Fuzzy TOPSIS (Case Study: Alavian Earth Dam)." Civil Engineering Journal 2, no. 4 (2016): 158-167.

Mikaeil, Reza, Sina Shaffiee Haghshenas, Yakob Shirvand, Mehdi Valizadeh Hasanluy, and Vali Roshanaei. "Risk Assessment of Geological Hazards in a Tunneling Project Using Harmony Search Algorithm (Case Study: Ardabil-Mianeh Railway Tunnel)." Civil Engineering Journal 2, no. 10 (2016): 546-554.

Luiyan, A., Dadkhah, R., Hashemi, R., "Khorasan water diversion tunnel stability analysis and support system designning." Journal of Tehran University Sciences 1 (1999): 37-45.

J. Šejnoha, D. Jarušková, O. Špačková, E. Novotná "Risk Quantification for Tunnel Excavation Process" International Journal of Mechanical Aerospace Industrial Mechatronic and Manufacturing Engineering, 3(10) 2009, 1200-1205.

Niknia, N., ZarrinKhu, H.R., Bayati, H., Azadi, J., Tunnelling risks detection and evaluation in inter basin water conveying projects (case study: Abiverd water conveying tunnel): Proceedings of the first international and 3th national Dam and Hydroelectric powerplant Conference., Tehran, 2011.

Taremi, M., Saeedi, M., Sabzkuh water convey tunnel geotechnical risks and ways to solve them: Proceedings of the first international and 3th national Dam and Hydroelectric powerplant Conference., Tehran, 2011.

Khakbaz, M.R., Saeedi, B., Methods to passing through potentially moveable fault zone: Proceedings of the first international and 3th national Dam and Hydroelectric powerplant Conference., Tehran, 2011.

Fraldi, M., Guarracino, F., Analytical solutions for collapse mechanisms in tunnels with arbitrary cross sections: International Journal of Solids and Structures 47, 2010

Chen, R., Wu, J., Causation Analysis of Collapse of Some Tunnel and Treatment Measures: Modern Tunnelling Technology, 2010-06

Wang, L., Hu, Y., Wang, B., Chen, Y., stability analysis and monitoring for tunnel in loose soils during construction, Chinese Journal of Rock Mechanics and Engineering, 2003-04

SEPASAD Engineering Co., “Sardasht Dam and power plant Engineering Geological Report (Occurred Collapses explanation)”, 2014.

Iran Geology and survey Organization, “Iran National Atlas”, 1996.

Pirmoradian, H., Beyranvand, P., Tayi Semiromi, S., Bakhshandeh Amnieh, H., Rahimi Dizaji, M., Determination of Geomechanical Parameters of Sardasht Dam Deviation Tunnel Using the Roclab1.0 Software: 7th National Civil Engineering Congress, Shahid Nikbakht Engineering Department, Zahedan University, 2013

Pirmoradian, H., Beyranvand, P., Tayi Semiromi, S., Bakhshandeh Amnieh, H., Peyrowi Nasab, P., Selection of a drilling method for the lower discharging shaft of Sardasht dam water deviation tunnel, using the Analytical Hierarchical Process (AHP), International Conference on Earth Sciences , Tehran, 2013

SEPASAD Engineering Co., “Sardasht Dam and power plant site Engineering Geological Report (Occurred Collapses explanation in second diversion tunnel)”, 2010.


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DOI: 10.21859/cej-03095

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Copyright (c) 2017 Akbar Esmailzadeh, Reza Mikaeil, sina Shaffiee Haghshenas

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