2003 SME Annual Meeting & Exhibit, 24–26 February 2003, Cincinnati, OhioAuthors: A. Adu-Acheampong (AAI) A geotechnical study was conducted to identify the cause(s) of stope instability at the Ashanti Mine (Obuasi, Ghana). As part of the investigation, laboratory testing of rock was performed and the rock mass was classified according to the Q-System (Barton et [...]
Numerical Modeling
ARMA General Meeting, Vancouver, British Columbia, Canada, 2007Authors: Bo Yu (AAI) and A. W. Khair (West Virginia University) In this paper, the finite element code, LS-DYNA 3D, was chosen as the simulation tool to study the rotary rock cutting process. By using an Automated Rotary Rock Cutting Simulator as the prototype, a numerical model [...]
MassMin Chile 2004, Santiago, Chile, August 2004Authors: L. J. Gilbride and J. F. T. Agapito (AAI) and R. Kehrman (Molycorp, Inc.) The Molycorp, Inc., Questa Mine, located in New Mexico, currently mines using a gravity-draw panel cave to extract molybdenum sulfide ore from the 600-m-deep D Orebody. Prior to initial development, geotechnical studies were undertaken [...]
(© Copyright 2005, ARMA, American Rock Mechanics Association)Alaska Rocks 2005, 40th U.S. Symposium on Rock Mechanics: Rock Mechanics for Energy, Mineral and Infrastructure Development in the Northern Regions, Anchorage, Alaska, June 25-29, 2005Authors: L. J. Gilbride and K.S. Free (AAI) and R. Kehrman (Molycorp, Inc.) The evolution of surface subsidence is an important focus of [...]
International Journal of Rock Mechanics and Mining Science, October 1988Authors: M. P. Hardy and M. I. Asgian (AAI) This paper addresses the problem of the interaction of borehole and fracture fluid pressures on fracture reopening during pressurization cycles used to determine the maximum principal stress perpendicular to a borehole in impermeable rock. Our interest arose [...]
41st U.S. Symposium on Rock Mechanics, Golden, Colorado, USA, July 17-21, 2006Authors: B. Yu, L. J. Gilbride and J. F. T. Agapito (AAI) Molycorp, Inc.’s Questa Mine plans to switch from gravity draw in Block 1 to a load-haul-dump (LHD) draw system in the East and West blocks of the D Orebody. Changes in mining [...]
Tunnelling ’91, London, England, Institution of Mining & Metallurgy, 14–18 April 1991 Authors: M. P. Hardy, A. M. Richardson, M. Lin, and J. F. T. Agapito (AAI) In recent years, numerical methods have gained a measure of acceptance in design of underground openings, not as a means of supplanting traditional methods, but as an aid [...]
International High-Level Radioactive Waste Management Conference, Las Vegas, Nevada, May 1994 Authors: M. Lin and M. P. Hardy (AAI), and S. Jung (Sandia National Laboratories) The impacts of thermal and seismic loads on the stability of the Exploratory Studies Facility North Ramp at Yucca Mountain were assessed using both empirical and analytical approaches. This paper [...]
U.S. Department of Energy, Office of Civilian Radioactive Waste Management, Yucca Mountain Site Characterization Project, under Contract No. DE-AC04-76DP00789Authors: S. J. Bauer (Sandia National Laboratories), M. P. Hardy and M. Lin (AAI) An understanding of the thermal and stress environment in the vicinity of repository openings is important for pre-closure performance considerations and worker health [...]
Proceedings of the 4th International Congress on Rock Mechanics, Geneva, Switzerland, September 1979 Authors: M. P. Hardy and C. M. St. John (University of Minnesota), and G. Hocking (Dames & Moore) Geotechnical numerical models capable of predicting the thermomechanical response and groundwater movements around an underground radioactive waste repository are vital to the success of [...]
Prepared for Sandia National Laboratories for the U.S. Department of Energy under Contract No. DE-AC04-76DP00789 Authors: S. J. Bauer (Sandia National Laboratories), and M. P. Hardy, R. Goodrich, and M. Lin (AAI) An understanding of the state of stress on faults is important for pre- and post-closure performance considerations for the potential high-level radioactive waste [...]
Mechanics of Jointed and Faulted Rock, Proceedings of the International Conference on Mechanics of Jointed and Faulted Rock, Institute of Mechanics, Technical University of Vienna, 18–20 April 1990Authors: L. S. Costin and S. J. Bauer (Sandia National Laboratories), and M. P. Hardy (AAI) The Yucca Mountain Project, managed by the Nevada Operations Office of the [...]
Focus ’93, Site Characterization and Model Validations, Las Vegas, Nevada, 26–29 September 1993 Authors: L. S. Costin (Sandia National Laboratories), and M. P. Hardy and C. E. Brechtel (AAI) Thermomechanical models are being developed to support the design of an Exploratory Studies Facility and a potential high-level nuclear waste repository at Yucca Mountain, Nevada. These [...]
25th International Ground Control Conference on Ground Control in Mining, 2006 Authors: Tim Ross and Bo Yu (AAI) and Chris Nyikos (Mountain Coal Company, LLC) Several shear failures were observed in Shaft #1 at the Mountain Coal Company, LLC, West Elk Mine, after mining longwall Panel 23, 1,100 ft to the east of Shaft #1. [...]
