| Title | Biaxial tests of some overcored samples from AECL's underground research laboratory, Lac du Bonnet, Manitoba |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Lau, J S O |
| Source | Canada Centre for Mineral and Energy Technology, Mining Research Laboratories, Division Report 89-55 (TR), 1989, 64 pages, https://doi.org/10.4095/325877
 Open Access |
| Image |  |
| Year | 1989 |
| Publisher | Energy, Mines and Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | Science and Technology; Nature and Environment; rock stress analyses; bedrock geology; lithology; igneous rocks; intrusive rocks; granites; nuclear waste disposal; nuclear energy |
| Illustrations | tables; plots |
| Released | 1989 05 01; 2020 07 28 |
| Abstract | In support of Atomic Energy of Canada Limited's in situ stress measurement program at the Underground Research Laboratory, biaxial tests and biaxial tests with axial load were conducted at the Canada
Centre for Mineral and Energy Technology (CANMET) to examine the effect of axial and side loads on the strains measured on the inside and on the outside of overcored rock samples obtained in the URL and the elastic constants derived from them. The
rock is a massive, grey, medium to coarse grained porphyritic granite. With axial loading, cell pressures as high as 36 MPa could be applied on the overcored specimens without causing disking. Without axial loading, a cell pressure as low as 13 MPa
could cause disking. There were fairly good agreements between the secant Young's modulus values obtained on the outside and on the inside of the hollow rock specimens in both the biaxial tests and the biaxial tests with axial load. The secant
Young's modulus values in the axial direction were found to be approximately 10 GPa higher than the modulus values in the circumferential direction, indicating that the rock specimens were highly anisotropic and the anisotropy was probably caused by
the microcracks present in the specimens. The secant Young's modulus values obtained in the biaxial tests with axial load at pressure levels above 28 MPa were very high. Selected uniaxial compression tests should be conducted on the overcored
specimens to check the effect of end constraint on the modulus values as well as to shed some light on the discrepancies in some of the axial strain readings. |
| GEOSCAN ID | 325877 |
|
|