From Engineering Computations: International Journal for Computer-Aided Engineering and Software: The Discrete Element Method: Numerical Modelling of Discontinua, Volume 21, Number 2/3/4, 2004
Dwayne D. Tannant
Department of Civil and Environmental Engineering,
University of Alberta, Alberta, Canada
Sons of Gwalia Southern Cross Operations, Southern Cross, Australia
Received February 2003
Revised July 2003
Accepted July 2003
Vol. 21 No. 2/3/4, 2004
Emerald Group Publishing Limited
Keywords Discrete manufacturing, Numerical analysis, Modelling
Abstract Simple discrete element models using PFC 2D models with bonded assemblies of particles were used to numerically simulate direct tension and block punching tests on thin spray-on tunnel liner materials to gain insight about the liner support mechanisms. PFC 2D input parameters were calibrated such that the rupture load and elongation at rupture were similar to the laboratory test data. The calibrated model of the liner material was then used to simulate a liner around a highly stressed tunnel in rock where stresses caused extensive fracturing near the top of the tunnel. The effect of the liner was analysed by modelling the tunnel with and without the liner and showed that the liner had minimal impact on fracture propagation in the rock because of the liner s highly deformable nature. However, the liner was able to retain the fractured rock in place.
Thin Spray-on Liners
Thin spray-on liners are a new form of underground rock support receiving increasing attention around the world. They have performance characteristics that lie between those of shotcrete and wire mesh. Various liner materials are currently being developed and tested in underground Canadian mines. They...
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