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Mining Publication: Numerical Modeling of the U1A Complex at the Nevada Test Site: Model Development and Comparison of Different Drift Mining Options
Keywords: Data analysis Drift mining Numerical modeling
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: August 2003
Authors: RK Zipf, FE Heuze
Conference Paper - August 2003
Download PDF Document (0.79 MB)
NIOSHTIC2 Number: 20023436
22nd Intl Conf on Ground Control in Mining. Morgantown, WV: West Virginia University, 2003 Aug; :308-317
Stress analysis programs such as MULSIM/NL, LAMODEL, MinSim 2000, and ExamineTAB are used in the mining industry to analyze stresses and displacements in coal mines, platinum mines, gold reefs, and tabular-type deposits. These relatively simple numerical models can efficiently simulate yielding and failure of a rock mass near a mine opening and subsequent stress transfer. The main input parameters for these models are a family of nonlinear stress-strain curves for the in-seam material. For many applications of these models, such as in coal mining, extensive field measurements and observations exist from which to estimate these stress-strain curves and calibrate the numerical models; however, such measurements are lacking for other types of mines. A three-step method is presented to determine nonlinear stress-strain curves for boundary-element (BE) programs used in many mining applications. The method requires a suite of lab-scale strength tests at various confining pressures. Note that this analysis uses lab-measured strength and modulus properties of alluvium. The dependency of the mechanical properties of alluvium on scale has not been established, although more tests are being planned. However, it is believed that the relative comparisons performed are valuable regardless of scale effects. First, the FLAC2D computer program is used to model the lab tests and determine cohesion and friction angle for a Mohr-Coulomb material model. Second, another FLAC2D model uses the cohesion and friction angle values to calculate vertical stress and strain around a single opening in the rock mass. This model calculates the stress-strain path of points at various distances from the opening boundary. Finally, based on these stress-strain paths, the stress-strain curves needed for a BE analysis are derived. This three-step method was demonstrated in a large, flat-lying underground test facility in very weak rock. The BE analyses agreed well with observations of failure at the test facility and provided a basis for evaluating the behavior of alternative layouts.
Image of publication Numerical Modeling of the U1A Complex at the Nevada Test Site: Model Development and Comparison of Different Drift Mining OptionsConference Paper - August 2003
Download PDF Document (0.79 MB)
NIOSHTIC2 Number: 20023436
22nd Intl Conf on Ground Control in Mining. Morgantown, WV: West Virginia University, 2003 Aug; :308-317
See Also
Analysis of Multiple Seam Stability
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Methane Diffusion Parameters for Sized Coal Particles: A Measuring Apparatus and Some Preliminary Results
Pillar Strength and Design Methodology for Stone Mines
Proceedings: New Technology for Ground Control in Multiple-seam Mining
Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
Task Analysis
Technology News 536 - NIOSH Develops New Software to Analyze and Reduce Noise Exposure
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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