TY - GEN
T1 - The effect of over excavation on the time-dependent convergence of a drift in Callovo-Oxfordian claystone
AU - Guayacán-Carrillo, L. M.
AU - Seyedi, D.
AU - Sulem, J.
AU - Ghabezloo, S.
AU - Noiret, A.
AU - Armand, G.
N1 - Publisher Copyright:
© 2016 Taylor & Francis Group, London.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Convergence measurements recorded for a drift excavated in two stages in Callovo-Oxfordian claystone are analyzed. In the first stage the drift is excavated with a diameter of 3.8 m. Then, three months later, the drift is over excavated to a final diameter of 5.2 m. In-situ measurements show an anisotropic convergence during the first stage with maximum and minimum values in horizontal and vertical directions respectively. In the second stage, the convergence is quasi isotropic. The closure ofwalls is fitted using a semi-empirical convergence law. The results show that in the first stage, the values for the parameters describing the time-dependent behavior are very close to those obtained for drifts excavated in the same direction (5 m diameter). It is observed that these values are lower in the second stage, suggesting that the over excavation could limit the delayed response of the ground. In contrary, this excavation method yields to a greater extent of the fractured zone in descending vertical direction.
AB - Convergence measurements recorded for a drift excavated in two stages in Callovo-Oxfordian claystone are analyzed. In the first stage the drift is excavated with a diameter of 3.8 m. Then, three months later, the drift is over excavated to a final diameter of 5.2 m. In-situ measurements show an anisotropic convergence during the first stage with maximum and minimum values in horizontal and vertical directions respectively. In the second stage, the convergence is quasi isotropic. The closure ofwalls is fitted using a semi-empirical convergence law. The results show that in the first stage, the values for the parameters describing the time-dependent behavior are very close to those obtained for drifts excavated in the same direction (5 m diameter). It is observed that these values are lower in the second stage, suggesting that the over excavation could limit the delayed response of the ground. In contrary, this excavation method yields to a greater extent of the fractured zone in descending vertical direction.
UR - https://www.scopus.com/pages/publications/85001638583
U2 - 10.1201/9781315388502-164
DO - 10.1201/9781315388502-164
M3 - Conference contribution
AN - SCOPUS:85001638583
SN - 9781138032651
SN - 9781138032651
T3 - Rock Mechanics and Rock Engineering: From the Past to the Future
SP - 945
EP - 950
BT - Rock Mechanics and Rock Engineering
A2 - Ulusay, Resat
A2 - Hindistan, Mehmet Ali
A2 - Tuncay, Ergün
A2 - Aydan, Ömer
A2 - Gerçek, Hasan
PB - CRC Press/Balkema
T2 - International Symposium on International Society for Rock Mechanics, ISRM 2016
Y2 - 29 August 2016 through 31 August 2016
ER -