Thin tunnel liners modelled with particle flow code

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.

Citation

Tannant, D.D. and Wang, C. (2004), "Thin tunnel liners modelled with particle flow code", Engineering Computations, Vol. 21 No. 2/3/4, pp. 318-342. https://doi.org/10.1108/02644400410519811