Discrete element modeling and numerical simulation of rock breaking by hob based on MatDEM
LIANG Liwei1, LIU Chun1,2*, 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
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.
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