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Modelling of Response of Tunnels Excavated in Squeezing Ground Condition
As a part of development of infrastructure in hill regions, many hydropower projects, all weather proof road and railway projects have been undertaken by the Government of India. The geology of hilly regions is very complex and fragile in nature. The rock masses are highly fractured and weathered. As a result, construction of large underground structures and their stability becomes a major issue in hilly regions. Therefore, it is necessary to understand the rock mass-tunnel support interaction in detail before any underground operation is undertaken in hilly regions. In this study, a case history of a Head Race Tunnel of Maneri Bhali Hydro-Electric Project Phase-I has been considered for investigation. The interaction phenomenon has been studied by using a novel finite element-based framework where elastic-perfectly plastic behaviour of poor rock mass is modelled by implementing actual Hoek–Brown yield criterion in association with non-associated plastic flow rule. Additionally, the elasto-plasticity in the behaviour of different tunnel support components has also been included in this framework. Under the scope of present study, tunnel convergence, plastic straining and the ground reaction curve were obtained for the considered tunnel section. The tunnel convergence obtained through present study is in good agreement with the field measured values of tunnel convergence. Hence, it can be said that the proposed framework is a convenient tool for detail analysis of the rock mass-tunnel support interaction and for design of supports of underground structures in poor-quality rock masses.
Modelling of Response of Tunnels Excavated in Squeezing Ground Condition
As a part of development of infrastructure in hill regions, many hydropower projects, all weather proof road and railway projects have been undertaken by the Government of India. The geology of hilly regions is very complex and fragile in nature. The rock masses are highly fractured and weathered. As a result, construction of large underground structures and their stability becomes a major issue in hilly regions. Therefore, it is necessary to understand the rock mass-tunnel support interaction in detail before any underground operation is undertaken in hilly regions. In this study, a case history of a Head Race Tunnel of Maneri Bhali Hydro-Electric Project Phase-I has been considered for investigation. The interaction phenomenon has been studied by using a novel finite element-based framework where elastic-perfectly plastic behaviour of poor rock mass is modelled by implementing actual Hoek–Brown yield criterion in association with non-associated plastic flow rule. Additionally, the elasto-plasticity in the behaviour of different tunnel support components has also been included in this framework. Under the scope of present study, tunnel convergence, plastic straining and the ground reaction curve were obtained for the considered tunnel section. The tunnel convergence obtained through present study is in good agreement with the field measured values of tunnel convergence. Hence, it can be said that the proposed framework is a convenient tool for detail analysis of the rock mass-tunnel support interaction and for design of supports of underground structures in poor-quality rock masses.
Modelling of Response of Tunnels Excavated in Squeezing Ground Condition
Lecture Notes in Civil Engineering
Latha Gali, Madhavi (editor) / Raghuveer Rao, P. (editor) / Majumder, Dipaloke (author) / Viladkar, M. N. (author) / Singh, Mahendra (author)
2020-08-14
21 pages
Article/Chapter (Book)
Electronic Resource
English
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