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Mining Publication: Determination of In Situ Deformation Modulus for Cemented Rockfill
Keywords: Extensometers Ground control Numerical modeling Pressure gauges Strain gauges
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: September 2003
Authors: DR Tesarik, JB Seymour
Conference Paper - September 2003
Download PDF Document (0.81 MB)
NIOSHTIC2 Number: 20024117
Technology Roadmap for Rock Mechanics, 10th Congress, International Society for Rock Mechanics. Vol. 2. Section 33, Johannesburg, South Africa, Sept. 8-10, 2003, S. African Institute of Mining and Metallurgy Symp. Series, 2003 Sep; :1209-1220
As part of safety and stability studies at three underground mines in the United States, researchers installed earth pressure cells and embedment strain gauges in cemented rockfill to measure stress and strain changes as mining progressed and the rockfill was loaded. Data from these instruments were used to calculate the in situ modulus of the rockfill for two of the mines. A three-dimensional numerical model of a cemented rockfill cap was validated with data from extensometers anchored in the mine roof and sill; this model was then used to estimate deformation modulus at the third mine because the earth pressure cells and embedment strain gauges recorded negligible changes. Rockfill binder used at these mines ranged from 4 to 8 per cent of the dry components by weight, the water-to-cement ratio was from 0.42 to1.0, and the largest aggregate size in the three mixes ranged from 5 to12 cm (2 to 4.7 in). The range of the calculated in situ deformation modulus values was large, but as expected, it was bracketed by modulus values for cemented tailings and roller-compacted concrete with similar cement contents and water-to-cement ratios.
Image of publication Determination of In Situ Deformation Modulus for Cemented RockfillConference Paper - September 2003
Download PDF Document (0.81 MB)
NIOSHTIC2 Number: 20024117
Technology Roadmap for Rock Mechanics, 10th Congress, International Society for Rock Mechanics. Vol. 2. Section 33, Johannesburg, South Africa, Sept. 8-10, 2003, S. African Institute of Mining and Metallurgy Symp. Series, 2003 Sep; :1209-1220
See Also
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
Ground Stress in Mining (Part 1): Measurements and Observations at Two Western U.S. Longwall Mines
Ground Stress in Mining (Part 2): Calibrating and Verifying Longwall Stress Models
Initial Stability Study of Large Openings for the National Underground Science Laboratory at the Homestake Mine, Lead, SD
Numerical Model Calibration for Simulating Coal Pillars, Gob and Overburden Response
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
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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