Convergence confinement method for squeezing prediction in rohtang tunnel: a case study
By: Jain, Ashwani
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Contributor(s): Rao, K. S.
Publisher: USA Springer 2022Edition: Vol.52(6), Dec.Description: 1410-1422p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: Several methods are available in the literature for the prediction of squeezing, rock bursting, swelling, etc., conditions in the Himalayan region having complex structural geology with rugged topography. During the construction of any underground structures in the Himalayan region various problems such as squeezing, rock bursting, and swelling are common. The squeezing condition had been categorized by several researchers using criteria of 1% deformation with respect to the excavation size of the tunnel. Deformation may terminate during construction or continue over a long time. If the supports are inadequate, tunnel deformation in squeezing ground conditions may continue over a period of time. Hence, a relationship between tunnel convergence and installed support behind the face is very important during the planning and designing of any project to avoid any cost and time overrun during construction. The convergence confinement method (CCM) is the best tool to define the relationship between decreasing internal pressure and increasing radial displacement in the tunnel. It has the ability to estimate face distance for support installation through ground reaction, longitudinal displacement, and support pressure relationship curves. In this study, this relationship has been studied on 64 tunnel sections of the 8.8 km long Rohtang road tunnel. CCM can also be used to design supports that fulfil particular safety factor design criteria. Hence, the paper focuses on the continuous CCM approach through the relationship between the variation in rock mass with geological strength index (GSI) varying from 9 to 60 and installed support utilizing parameters such as safety coefficient, squeezing prediction, and support failure chances.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-0009 |
Several methods are available in the literature for the prediction of squeezing, rock bursting, swelling, etc., conditions in the Himalayan region having complex structural geology with rugged topography. During the construction of any underground structures in the Himalayan region various problems such as squeezing, rock bursting, and swelling are common. The squeezing condition had been categorized by several researchers using criteria of 1% deformation with respect to the excavation size of the tunnel. Deformation may terminate during construction or continue over a long time. If the supports are inadequate, tunnel deformation in squeezing ground conditions may continue over a period of time. Hence, a relationship between tunnel convergence and installed support behind the face is very important during the planning and designing of any project to avoid any cost and time overrun during construction. The convergence confinement method (CCM) is the best tool to define the relationship between decreasing internal pressure and increasing radial displacement in the tunnel. It has the ability to estimate face distance for support installation through ground reaction, longitudinal displacement, and support pressure relationship curves. In this study, this relationship has been studied on 64 tunnel sections of the 8.8 km long Rohtang road tunnel. CCM can also be used to design supports that fulfil particular safety factor design criteria. Hence, the paper focuses on the continuous CCM approach through the relationship between the variation in rock mass with geological strength index (GSI) varying from 9 to 60 and installed support utilizing parameters such as safety coefficient, squeezing prediction, and support failure chances.
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