Two-Dimensional Numerical Simulation of Rock Fragmentation by TBM Cutting Tools in Mixed-Face Ground

被引：23
作者：
Zhou, Xiao-Ping [1 ]
Zhai, Shu-Fang [1 ,2 ]
Bi, Jing [1 ]
机构：
[1] Chongqing Univ, Sch Civil Engn, Chongqing 400000, Peoples R China
[2] Henan Univ Technol, Coll Civil Engn & Architecture, Zhengzhou 450000, Henan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF GEOMECHANICS | 2018年 / 18卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Tunnel-boring machine (TBM); Mixed-face ground; Mechanism; General particle dynamics (GPD) code; Rock fragmentation; DAMAGE CONSTITUTIVE MODEL; SOFT ROCK;
D O I：
10.1061/(ASCE)GM.1943-5622.0001081
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
In the study described in this paper, a general particle dynamics (GPD) code was developed to simulate rock fragmentation by tunnel-boring machine (TBM) cutters in mixed-face ground. In the GPD code, a novel algorithm of the contacts at the boundary between two different media was proposed. The mechanism of rock fragmentation by two disc cutters and the effects of cutter spacing on rock fragmentation in mixed conditions were investigated. With increasing cutter spacing, the propagation pattern of Hertzian cracks varied and an optimal cutter spacing was found. The mechanism of rock fragmentation by a disc cutter and a drag bit and the effects of the acting position of different TBM cutters on rock fragmentation in mixed conditions were studied. The optimal acting position of the disc cutter and the drag bit was found to benefit the effectiveness of TBM rock fragmentation.
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页数：17
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