A numerical study of rock scratch tests using the particle-based numerical manifold method

被引：28
作者：
Li, Xing [1 ,2 ]
Zhang, Qianbing [2 ]
Li, Jianchun [1 ]
Zhao, Jian [2 ]
机构：
[1] Southeast Univ, Sch Civil Engn, Nanjing 211189, Jiangsu, Peoples R China
[2] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia
来源：
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2018年 / 78卷
基金：
中国国家自然科学基金;
关键词：
Numerical manifold method; Rockcutting; Scratch; Ductile-brittle transition; Mechanical specific energy; FAILURE MODE TRANSITION; FRAGMENTATION PROCESS; TBM CUTTERS; SIMULATION; DEPTH; BITS;
D O I：
10.1016/j.tust.2018.04.029
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
A better understanding of the rock-tool interaction is necessary to improve the cutting efficiency. In this paper, we present a numerical study of rock scratching using a newly developed particle-based numerical manifold method (PNMM). The scratching processes with different cutting depths are first simulated, where the failure pattern and cutting force are discussed. The transition of brittle-ductile failure with an increased cutting depth is reproduced. It is validated that when the cutting depth is intermediate, rock scratching presents a transitional mode between ductile and brittle failure. Then, a parametric study is performed by a series of numerical simulations. The effect of cutter operational parameters on the cutting force and energy consumed by the cutter are studied. Three operational parameters of the cutter are considered in this study, including the cutting depth, cutting speed, and cutter rake angle. An estimation of the transitional cutting depth range is given by the result of the mechanical specific energy of the cutter. Besides, some advice is provided to improve the efficiency of rock cutting in engineering practice.
引用
收藏
页码：106 / 114
页数：9
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