RT Journal Article
T1 Anisotropic deformability and strength of slate from NW-Spain
A1 Alejano Monge, Leandro Rafael
A1 Gonzalez Fernandez, Manuel Alejandro
A1 Estevez Ventosa, Xian
A1 Song, Fei
A1 Delgado Martín, J.
A1 Muñoz Ibáñez, A.
A1 González Molano, N.
A1 Alvarellos, J.
K1 2506.17 Mecánica de las Rocas
K1 2599 Otras Especialidades de la Tierra, Espacio o Entorno
AB Slates are metamorphic rocks characterized by the pervasive occurrence of cleavage or foliation producing a highly anisotropic mechanical behavior characterized by fissility. Deformability and strength of these rocks are therefore dependent on the cleavage plane orientations relative to the principal stresses. In this study, the failure and deformability of these rocks are experimentally investigated by means of a set of standard uniaxial and triaxial compression tests on samples cut with the cleavage forming different angles. Propagation velocity measurements have also been taken in a good number of specimens. Compression tests show that deformability and strength are clearly anisotropic for this rock and that failure through the cleavage plane is observed in the range of dip angles from 15 to 75°. Transversely isotropic elastic parameters are fit based on improved existing approaches. Moreover, the strength of tested samples cut normal and parallel to foliation relevantly differ, something noted qualitatively in the past by some authors in some metamorphic anisotropic rocks. However, this difference has neither been explicitly reported for the case of other foliated sedimentary rocks such as shales, nor formalized in theoretical strength approaches. The triaxial compression experimental data on slates were fit with the Jaeger's plane of weakness (JPW) model. Strength criteria differentiating the strength in directions normal and parallel to foliation are proposed to adapt the JPW model to the observations in slate strength behavior. Other model improvement is proposed, the use of a non-linear strength criterion for the intact rock (Hoek-Brown), which shows to better represent observed strength laboratory results.
PB International Journal of Rock Mechanics and Mining Sciences
SN 13651609
YR 2021
FD 2021-12
LK http://hdl.handle.net/11093/2578
UL http://hdl.handle.net/11093/2578
LA eng
NO International Journal of Rock Mechanics and Mining Sciences, 148, 104923 (2021)
NO Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG
NO Agencia Estatal de Investigación | Ref. RTI2018-093563-B-I00
DS Investigo
RD 13-oct-2024