POSSIBLE MECHANISM FOR IMPROVING STRENGTH CHARACTERISTICS ALONG A PRE-SHEARED PLANE IN COLORADO SHALES

2023

Erin Moss Tressel

Colorado Group shales are prevalent throughout the Western Canadian Sedimentary Basin.  During multiple past glaciations, these shales have been sheared creating planes of weakness that control the overall strength of the material.  One concept for improving the strength of these pre-sheared weakness planes is to disturb and interrupt the plane of weakness through methods such as controlled blasting.  To test the viability of this concept, several large-scale direct shear tests on broken Colorado Group shale were completed.  This paper presents the initial results of this testing and outlines further work that could be completed to continue the proof of concept.  If the pre-sheared weakness planes can be controlled or influenced, improvements in excavating steeper slopes or mining works within the Colorado Group shales could be achieved.

$20.00