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Stability Assessment of Large Caverns in Horizontally Bedded Strata Considering Time-Dependent Response
The stability of a cavern excavated in the Chagrin shale was evaluated. During the excavation of the top heading, deformation of rock along the roof exceeded what is typically observed in rock cavern construction. The excavation sequence caused the increased deformations during construction due to rock disturbance. In addition, time-dependent rock deformations were observed during and after excavation. Several factors were believed to be the source of this time-dependent deformation including stress changes induced by the excavation, strain softening along the bedding planes, and creep of the shaley rock under compressive stresses. Finite element analysis (FEA) was carried out to simulate the rock conditions and sequential excavation due to the concerns regarding the unanticipated behavior of the rock mass. The FEA incorporated the bedding planes as observed in the cavern to evaluate the long-term deformations and stability. Rock mass behavior including time-dependent deformation was measured by means of rock surface convergence monitoring points (CMP) and multi-point borehole extensometers (MPBX). A time-dependent constitutive model was incorporated in the FEA to evaluate the potential long-term movement in the cavern. Creep tests were performed on core samples of the Chagrin shale from the wall of the cavern to estimate the time-dependent constitutive model parameters.
Stability Assessment of Large Caverns in Horizontally Bedded Strata Considering Time-Dependent Response
The stability of a cavern excavated in the Chagrin shale was evaluated. During the excavation of the top heading, deformation of rock along the roof exceeded what is typically observed in rock cavern construction. The excavation sequence caused the increased deformations during construction due to rock disturbance. In addition, time-dependent rock deformations were observed during and after excavation. Several factors were believed to be the source of this time-dependent deformation including stress changes induced by the excavation, strain softening along the bedding planes, and creep of the shaley rock under compressive stresses. Finite element analysis (FEA) was carried out to simulate the rock conditions and sequential excavation due to the concerns regarding the unanticipated behavior of the rock mass. The FEA incorporated the bedding planes as observed in the cavern to evaluate the long-term deformations and stability. Rock mass behavior including time-dependent deformation was measured by means of rock surface convergence monitoring points (CMP) and multi-point borehole extensometers (MPBX). A time-dependent constitutive model was incorporated in the FEA to evaluate the potential long-term movement in the cavern. Creep tests were performed on core samples of the Chagrin shale from the wall of the cavern to estimate the time-dependent constitutive model parameters.
Stability Assessment of Large Caverns in Horizontally Bedded Strata Considering Time-Dependent Response
Moridzadeh, Mohammad (author) / Djavid, Mohammad (author) / Doyle, Barry (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 454-463
2019-03-21
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2019
Roof deflections and sag in jointed, horizontally bedded strata — A numerical study
| Online Contents | 1988
Roof deflections and sag in jointed, horizontally bedded strata — A numerical study
| Springer Verlag | 1988
Stability of single openings in horizontally bedded rock
| Elsevier | 1969