The Choice of Basic Pillar Design Theory for Locked Sand Condition

Zi Wei Ding; Amirhossein Bagherieh; Rui Min Feng; Xing Xing Wen

doi:10.4028/www.scientific.net/AMM.256-259.354

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 256-259The Choice of Basic Pillar Design Theory for...

The Choice of Basic Pillar Design Theory for Locked Sand Condition

Abstract:

Because of unique properties of locked sand (very high friction angle and very low cohesion), a new pillar design method based on present basic pillar design theories must be developed. Wilson theory puts its focus on confining pressure, which is related to friction angle and cohesion. Triaxial tests results show that locked sand at Pattison mine has an average friction angle of 57°, which means the strength of the material increases rapidly with the confining pressure, and average cohesion of 2.6 MPa. Results show that choosing Wilson theory as basic pillar design theory not only considers the high friction angle of locked sand, but also minimizes the effects of Wilson’s hypothesis of neglecting the unconfined strength.

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Periodical:

Applied Mechanics and Materials (Volumes 256-259)

Pages:

354-357

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.256-259.354

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Online since:

December 2012

Authors:

Zi Wei Ding, Amirhossein Bagherieh, Rui Min Feng, Xing Xing Wen

Keywords:

Confining Pressure, Fiction Angle, Locked Sand, Size and Shape Effect, Triaxial Test

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