If you have access to OneMine as part of a member benefit, log in through your member association website for a seamless user experience.
Pre-mining stresses at some hard rock mines in the Canadian Shield
×
Citation (Style = APA)
Arjang, B. (1989). Pre-mining stresses at some hard rock mines in the Canadian Shield. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
Citation Downloads
Reference Manager (RIS)
SpreadSheed (CSV)
Arjang, B. (1989). Pre-mining stresses at some hard rock mines in the Canadian Shield. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
Citation Downloads
Reference Manager (RIS)
SpreadSheed (CSV)
Organization: International Conference on Ground Control in Mining
Pages: 7
Publication Date:
Jan 1, 1989
Email to a Friend
Abstract
Abstract
| ABSTRACT: Ground stresses are one of the significant factors in the context of rockbursts and underground instability at some hard rock mines in Canada. Overcoring strain relief measurements using triaxiaI strain eel is were performed at depths between 60 to 1890 m at several mine sites to provide stress data for stability analysis and optimum mine design. Pre-mining ground stress determinations from 64 stress tensor analyses resulted in the following average stress gradients: Maximum horizontal stress. -Hmax - 8.18 - 0.0122 MPa/m depth Minimum horizontal stress. _-,,min - 3.64 - 0.0276 MPa/m depth Average horizontal stress. -11, 5.91 - 0.03-19 MPs m depth Vertical stress. '-, - 0.0266 - 0.008 MPa/m depth The maximum and minimum horizontal compressive stresses. with an average ratio of 1.75 ,0..45. prevail in east--west and northerly directions. respectively. Horizontal compressive stresses in excess of vertical overburden load were determined. indicating large variations in ratios to a depth of about 1000 m with decreasing trend towards depth. From present data. a particular regional zoning for the magnitude and direction of horizontal stress fields cannot be outlined. A common feature at mines with near vertical orebodies is that the maximum horizontal compressive stress acts perpendicular to strike while the minimum horizontal compressive stress is aligned on-strike. The vertical stress components approach the gravitational overburden load. |
Full Article Download:
