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Using Discrete Element Method to Study the Rock Breaking Effect of Worn TBM Cutters
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Journal Article
Using Discrete Element Method to Study the Rock Breaking Effect of Worn TBM Cutters
2022
Overview
Focusing on the analysis of specific energy
SE
and crack development characteristics, this research aims to clarify the rock breaking effect of worn TBM cutters. Based on the geometric characteristics of rock face under the action of the worn cutters, the rock breaking method affected by the ridge was proposed, and the discrete element method was used to establish a double-cutter indentation model for simulation. The blade height difference
h
and blade width
T
caused by cutter wear were used as variables, and the influence of cutting spacing and cutting sequence was considered. Study showed that the specific energy
SE
of rock-breaking decreased slowly with the increasing
h
, and then rose sharply when
h
exceeded the critical blade height difference
h
c
. When the cutting distance
s
= 60, 70, 80 mm,the corresponding
h
c
values were 10, 15, 15 mm, respectively. From the perspective of rock breaking process, worn cutters formed ridges on the rock surface, which affected the direction of crack development. When
h
<
h
c
, the lateral cracks produced by the cutter extrusion developed in the direction of adjacent cutter inside the ridge, forming a large through rock fragment. When
h
>
h
c
, the cracks emerged from the slope of the ridge, no large rock fragments were formed, resulting in a sudden increase in
SE
. Experimental verification showed that the simulation results were effective and can provided reference for worn TBM cutter changing.
Publisher
Springer International Publishing,Springer Nature B.V
Subject
