Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Tunnel Excavation in Highly Stressed Weak Rockmass Condition
In any underground hyropower projects, there is mutual understanding between displacement recordings with the selection of excavation methods and support systems. The type of underground excavations mainly depends on rock mass geology, rock structure, hydrology and insitu stress regime. The extents of anticipated deformations and stresses arising due to alter in the equilibrium determines the type of support system required to maintain the stability of the excavated portion. This technical paper describes how instrumentation data aided in deciding the excavation techniques and supporting system whicle excavating horse-shoe shaped head race tunnel in fair to poor rock mass conditions under high induced stresses at Punatsangchhu-II Hydroelectric Project, Bhutan. The main focus was to excavate the stretch of 110 m (360.892 ft) in higly critical zone without any major deformations which could have resulted in collapse and hampered major activites. A good geological preinvestigation in combination with on-site investigations resulted in taking right decision to safely perform the excavation and support the tunnel. Displacement measurments with advanced monitoring setups provided continuous information about the condition of rock mass. Utilization of these instrumentation data in combination with geological studies, provided important information in selecting the excavation technique and reviewing the support system which resulted in successful excavation of 11 m (36.08 ft) large diameter horse-shoe shaped head race tunnel in weak rock mass condition.
Tunnel Excavation in Highly Stressed Weak Rockmass Condition
In any underground hyropower projects, there is mutual understanding between displacement recordings with the selection of excavation methods and support systems. The type of underground excavations mainly depends on rock mass geology, rock structure, hydrology and insitu stress regime. The extents of anticipated deformations and stresses arising due to alter in the equilibrium determines the type of support system required to maintain the stability of the excavated portion. This technical paper describes how instrumentation data aided in deciding the excavation techniques and supporting system whicle excavating horse-shoe shaped head race tunnel in fair to poor rock mass conditions under high induced stresses at Punatsangchhu-II Hydroelectric Project, Bhutan. The main focus was to excavate the stretch of 110 m (360.892 ft) in higly critical zone without any major deformations which could have resulted in collapse and hampered major activites. A good geological preinvestigation in combination with on-site investigations resulted in taking right decision to safely perform the excavation and support the tunnel. Displacement measurments with advanced monitoring setups provided continuous information about the condition of rock mass. Utilization of these instrumentation data in combination with geological studies, provided important information in selecting the excavation technique and reviewing the support system which resulted in successful excavation of 11 m (36.08 ft) large diameter horse-shoe shaped head race tunnel in weak rock mass condition.
Tunnel Excavation in Highly Stressed Weak Rockmass Condition
Lecture Notes in Civil Engineering
Verma, Amit Kumar (Herausgeber:in) / Mohamad, Edy Tonnizam (Herausgeber:in) / Bhatawdekar, Ramesh Murlidhar (Herausgeber:in) / Raina, Avtar Krishen (Herausgeber:in) / Khandelwal, Manoj (Herausgeber:in) / Armaghani, Danial (Herausgeber:in) / Sarkar, Kripamoy (Herausgeber:in) / Naveen, G. C. (Autor:in) / Prasad, B. N. V. Siva (Autor:in) / Balachander, R. (Autor:in)
International Conference on Geotechnical Challenges in Mining, Tunneling and Underground Infrastructures ; 2021
Proceedings of Geotechnical Challenges in Mining, Tunneling and Underground Infrastructures ; Kapitel: 14 ; 241-258
04.06.2022
18 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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