Validation of GPD to Model Rock Fragmentation by TBM Cutters

Abstract

In this paper, a novel meshless numerical method known as general particle dynamics (GPD) is developed to reveal the mechanism of the rock fragmentation using tunnel-boring machine (TBM) cutters. Rock fragmentation by one cutter and by two cutters is investigated using GPD. The numerical results obtained from GPD well agree with the previous experimental and numerical results. Moreover, the effects of arrays of flaws on rock fragmentation are also studied using GPD as well as stress fields and rock fragmentation efficiency. It is found from the numerical results that arrays of flaws significantly influence the drivage efficiency of rock fragmentation as well as the depth of chipping and the coalescence modes of flaws.