Abstract
The results of previous numerical modelling studies to investigate excavation stress effects around the Site Characterization Validation (SCV) drift at the Stripa mine have been reviewed. Though three-dimensional fractures were not directly simulated in previous studies, estimates of stresses on fracture planes were made. This study examines the direct effect of fractures on excavation stresses around the site validation drift for the purpose of understanding how excavation-induced stress changes might influence fluid flow in fractures. Three-dimensional stress modelling was carried out using the discontinuum code 3DEC to determine the state of stress around the drift. Fractures were assumed to have linear elastic normal behavior and elastic perfectly-plastic shear behavior. Results suggest that fracture shear displacements are small enough to be elastic - that is, no significant slip was evident. Fractures from the major fracture sets generally tend to close immediately around the drift, while further in the wall rock they tend to slightly open as a result of the excavation. The presence of fractures produce stress distributions that differ little from continuum models and analytic solutions. The most important difference between the continuum and discontinuum models is that the fracture behavior results in a nonuniform distribution of stresses around the
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Citation Formats
Tinucci, J P, and Israelsson, J.
Site characterization and validation - excavation stress effects around the validation drift.
Sweden: N. p.,
1991.
Web.
Tinucci, J P, & Israelsson, J.
Site characterization and validation - excavation stress effects around the validation drift.
Sweden.
Tinucci, J P, and Israelsson, J.
1991.
"Site characterization and validation - excavation stress effects around the validation drift."
Sweden.
@misc{etde_10142447,
title = {Site characterization and validation - excavation stress effects around the validation drift}
author = {Tinucci, J P, and Israelsson, J}
abstractNote = {The results of previous numerical modelling studies to investigate excavation stress effects around the Site Characterization Validation (SCV) drift at the Stripa mine have been reviewed. Though three-dimensional fractures were not directly simulated in previous studies, estimates of stresses on fracture planes were made. This study examines the direct effect of fractures on excavation stresses around the site validation drift for the purpose of understanding how excavation-induced stress changes might influence fluid flow in fractures. Three-dimensional stress modelling was carried out using the discontinuum code 3DEC to determine the state of stress around the drift. Fractures were assumed to have linear elastic normal behavior and elastic perfectly-plastic shear behavior. Results suggest that fracture shear displacements are small enough to be elastic - that is, no significant slip was evident. Fractures from the major fracture sets generally tend to close immediately around the drift, while further in the wall rock they tend to slightly open as a result of the excavation. The presence of fractures produce stress distributions that differ little from continuum models and analytic solutions. The most important difference between the continuum and discontinuum models is that the fracture behavior results in a nonuniform distribution of stresses around the excavation. The effect of fractures on displacements is most pronounced in the highly fractured H-zone, which strikes nearly perpendicular to the drift. (au).}
place = {Sweden}
year = {1991}
month = {Aug}
}
title = {Site characterization and validation - excavation stress effects around the validation drift}
author = {Tinucci, J P, and Israelsson, J}
abstractNote = {The results of previous numerical modelling studies to investigate excavation stress effects around the Site Characterization Validation (SCV) drift at the Stripa mine have been reviewed. Though three-dimensional fractures were not directly simulated in previous studies, estimates of stresses on fracture planes were made. This study examines the direct effect of fractures on excavation stresses around the site validation drift for the purpose of understanding how excavation-induced stress changes might influence fluid flow in fractures. Three-dimensional stress modelling was carried out using the discontinuum code 3DEC to determine the state of stress around the drift. Fractures were assumed to have linear elastic normal behavior and elastic perfectly-plastic shear behavior. Results suggest that fracture shear displacements are small enough to be elastic - that is, no significant slip was evident. Fractures from the major fracture sets generally tend to close immediately around the drift, while further in the wall rock they tend to slightly open as a result of the excavation. The presence of fractures produce stress distributions that differ little from continuum models and analytic solutions. The most important difference between the continuum and discontinuum models is that the fracture behavior results in a nonuniform distribution of stresses around the excavation. The effect of fractures on displacements is most pronounced in the highly fractured H-zone, which strikes nearly perpendicular to the drift. (au).}
place = {Sweden}
year = {1991}
month = {Aug}
}