Numerical and experimental investigation of rock breaking method under free surface by TBM disc cutter

被引：23
|
作者：
Zhang Xu-hui [1 ,2 ]
Xia Yi-min [1 ,2 ]
Zeng Gui-ying [1 ,2 ]
Tan Qing [1 ,2 ]
Guo Ben [1 ,2 ]
机构：
[1] Cent S Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China
来源：
JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2018年 / 25卷 / 09期
基金：
中国国家自然科学基金;
关键词：
free surface; tunnel boring machine; disc cutter; rock breaking method; LINEAR CUTTING TEST; BORING MACHINE TBM; FRAGMENTATION; PERFORMANCE; EXCAVATION; GRANITE; STRESS;
D O I：
10.1007/s11771-018-3900-y
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
To study the rock breaking method under the free surface induced by disc cutter, the rock breaking simulations were first conducted based on the discrete element method, and the dynamic process of rock breaking under the free surface was studied including stressed zone, crush zone, crack initiation and propagation. Then the crack propagation conditions, specific energy, etc. under different free surface distance (S) were also investigated combined with linear cutting experiments. The results show that the rock breaking process under the free surface induced by disc cutter is dominated by tension failure mode. There exists a critical S to promote crack propagation to free surface effectively. And this rock breaking method can improve the rock breaking force and breaking efficiency significantly when proper.
引用
收藏
页码：2107 / 2118
页数：12
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