Distinct element analysis of mechanism of rock fragmentation induced by TBM cutting in simply composite rock mass with multiple cutters

被引：0

作者：

Jiang, Mingjing ^{[1
,2
,3
,4
]}

Fu, Cheng ^{[1
]}

Wang, Huaning ^{[5
]}

Liu, Jun ^{[3
,4
]}

Liao, Youbin ^{[6
]}

Chen, Youliang ^{[6
]}

机构：

[1] School of Civil Engineering, Tianjin University, Tianjin,300072, China

[2] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin,300072, China

[3] State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai,200092, China

[4] College of Civil Engineering, Tongji University, Shanghai,200092, China

[5] College of Civil Engineering, Tongji University, Shanghai,200092, China

[6] University of Shanghai for Science and Technology, Shanghai,200093, China

来源：

Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2019年 / 52卷

关键词：

Bond contact models - Composite rock - Cutter - Distinct element analysis - Distinct element methods - Fracture mechanisms - Rock breaking efficiencies - Rock fragmentation;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The PFC2D software, incorporated with a size-dependent bond contact model, was employed to investigate the fracture mechanism induced by TBM cutting in simply composite rock mass. The rock fracture process was simulated under the action of cutting with single, double and triple cutters. The numerical results show that the process of rock fragmentation can be described with three stages: loading stage, unloading stage and residual leap stage. The analysis on the thrust-intrusion depth curve for the cutting in composite rock mass with double and triple cutters demonstrates that the cutter reaches the three stages is slightly slower on soft rock than on hard rock. A large difference was observed between/among cutters on the peak normal thrust, which will induce the wear of the cutters easily. For the rock mass composited by granite and greenschist, contact force chains are segmented by the interface between hard rock and soft rock, and bond breakage of hard rock is more than of soft rock, and through cracks form easily in double and triple cutters breaking rock. Rock breaking efficiency by double cutter is larger than by triple cutter with the latter larger than by single cutter. Besides the breaking efficiency by the double cutter is almost twice as that in other cases. © 2019, Editorial Office of China Civil Engineering Journal. All right reserved.

引用

页码：120 / 126