Finite element simulation of shotcrete exposed to underground explosions

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Title: Finite element simulation of shotcrete exposed to underground explosions

Author(s): Lamis Ahmed, Richard Malm, Anders Ansell

Publication: NCR

Volume: 45

Issue: 5

Appears on pages(s): 59-74

Keywords: Shotcrete, rock, vibration, blasting, finite element analysis.

Date: 6/15/2012

Abstract:
An elastic finite element model is used to simulate the induced stress waves from blasting, propagating in rock towards shotcrete on a tunnel wall. Due to the inhomogeneous nature of the rock, the stress waves attenuate on its way from the point of explosion towards the shotcrete on the rock surface. Material damping for the rock-mass is estimated from in-situ measurements. The vibration resistance of the shotcrete-rock support system depends on the material properties of the shotcrete. Age-dependent material properties are varied to investigate the behaviour of young shotcrete subjected to blast loading. Finally, finite element analysis results are presented and verified through comparison with other numerical models, measurements and observations.


Norwegian Concrete Association, International Partner Access.

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