If you have access to OneMine as part of a member benefit, log in through your member association website for a seamless user experience.
|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.|
Additional chapters/articles from the SME-ICGCM book Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
|Rock Mechanics And Ground Control For Underground Mining And||Underground Storage, With Emphasis On Storage In Excavated R||Rock Classification For Portal Design||Laboratory And Field Characterization Of Immediate Floor Str||Comparative Study Of Western US Longwall Panel Entry Systems||Supercomputer Assisted Three-Dimensional Finite Element Anal||DEPOWS - A Powered Support Selection Model||A Study Of Displacement Field Of Main Roof In Longwall Minin||Cavability Investigation Of A Stratabound Copper Deposit, To||Influence Of Discontinuity Orientations And Strength On Cava||Premining Stability Analysis Of A Shaft Pillar At The Homest||Identification Of Critical Slope Failure Surfaces With Criti||Improving Design Methodology For Innovative Rock Mechanics D||Stability Evaluation Of Alternative Designs Of Drift-And-Fil||In Situ Stress For Underground Excavation Design In A Natura||Application Of Physical And Mathematical Modelling In Underg||Complex Seismic Trace Attributes In Coal Exploration||Changes In Seismic Measurements With Blast Induced Fracturin||Changes In The Seismic Properties Of The Cover Produced By L||Crosshole Seismics: Applications In Mining||Geotechnical Mapping By Seismic Imaging In Underground Mines||Experimental Study Of Line Electrode Method To Detect Underg||Time-Dependent Behavior Of Rocks: Laboratory Tests On Hollow||Pillar Sizing||An Applications Approach To Barrier Pillar Design For Improv||Yield Pillar Application Under Strong Roof And Strong Floor||Methods To Determine Pillar Stress Distribution And Its Effe||Correlation Between Unconfined Compressive And Point Load St||Study Of Coal Fragmentation Under Conical Bit Indentation||Development of in-situ stress measurement technique using ul||Understanding the hydraulic pressure cell||Development of a mechanistic model for prediction of maximum||Subsidence prediction using a laminated linear model||Subsidence and environmental impacts in Japanese coal mining||Surface damage due to longwall mining - A case study||Pre-mining stresses at some hard rock mines in the Canadian||Estimation of in-situ material strength||The research on the mechanical properties of hard roof in un||Relationship between the clay fabric of roof shales and roof||Failure mechanisms in ultra-close seam mining||An analysis of roof-pillar-weak floor interaction in partial||Finite element analysis and comparison of shaly mine roof su||Stability analysis and characterization of ground subsidence||Subsidence monitoring at a shallow partial extraction room-a||Assessment of surface fracture depth and intensity due to su||Prediction of surface movement with emphasis on horizontal d||Numerical simulation of coal pillar loading with the aid of||Three-dimensional FEM analysis to sale field measurements fr||Front abutment effects on supplemental support in predriven||Direct determination of failure surfaces in earth slopes||Hydraulic stowing - A solution for subsidence due to undergr||Research on the rational structure of tensible rockbolt and||System behavior analysis of the ground movement around a lon||CISPM - A subsidence prediction model||Dynamic rock anchors||Ropes mine crown pillar rock mechanics||Deformation and failure-time prediction in rock mechanics||Influence of joints on the elastic response of a LFUFL stope||Support selection of mine roadways by means of a computer pr||Theoretical analysis of breaking strength of mine pillars an||A comparison between two- and three-dimensional numerical mo|