基于MatDEM的盾构滚刀破岩离散元建模与数值模拟

Hazard Control in Tunnelling and Underground Engineering

2019, Vol. 1

Issue (3): 116-122 DOI:

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Discrete element modeling and numerical simulation of rock breaking by hob based on MatDEM

LIANG Liwei¹, LIU Chun^1,2*, QIN Yan¹, ZHU Chenguang¹, DENG Shang²

1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;
2. Nanjing University(Suzhou)High-tech Institute, Suzhou 215123, Jiangsu, China

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Abstract The interaction between the hob and the rock mass is the core of TBM technology, and numerical simulation plays an important role in studying this process. In this paper, a hob and a soft-strong inter-bedded rock model was built based on further development of discrete element software MatDEM, which contained 502 thousand particles. By simulating the process of the rock breaking by a hob, as well as recording and analyzing, including boundary and hob force, particle connection, energy conversion, heat distribution and so on. The simulation results showed that, when strong rock breaked, the force of boundary and hob changing obviously, and the particles had greater force in the direction perpendicular to the hob and layer, but when weak rock layer was breaking, the inner boundary and the hob bore less stress, and the force of the hob was uniform; There were a few of broken joints in strong rock layer, and breaking volume of rock mass was small; During this process a lot of frictional heat was produced, and the accumulate of energy in strong rock was larger. MatDEM could simulate rock breaking process by hob effectively. By modifying the shape of hob and parameter of rock, this method could be further used for simulation of large-scale rock breaking by hob in other engineering conditions. It also provided a new way for numerical simulation of large-scale hob breaking rock.

Key words： rock breaking by hob discrete element method MatDEM energy composite rock model

Received: 17 September 2018 Published: 13 November 2019

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	LIANG Liwei
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Cite this article:

LIANG Liwei,LIU Chun,QIN Yan, et al. Discrete element modeling and numerical simulation of rock breaking by hob based on MatDEM[J]. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(3): 116-122.

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http://tunnel.sdujournals.com/EN/ OR http://tunnel.sdujournals.com/EN/Y2019/V1/I3/116

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