›› 2009, Vol. 30 ›› Issue (9): 2823-2829.

• Numerical Analysis • Previous Articles     Next Articles

Research on numerical simulation of rock fragmentation by TBM cutters using particle flow method

SU Li-jun1, 2, SUN Jin-shan3, 1, LU Wen-bo1   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Changjiang Institute of Survey, Planning, Design & Research, Wuhan 430010, China; 3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
  • Received:2008-11-05 Online:2009-09-10 Published:2010-03-24

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Abstract:

In order to study the rock fragmentation mechanism and its influential factors, a numerical simulation method for simulating the rock fragmentation by the tunnel boring machine (TBM) cutters is proposed which is based on particle flow code (PFC) method. With PFC method, the two dimension numerical models of rock material and TBM cutters are created. The results show that the rock fragmentation process can be divided in 3 phases, which are fragmentation by impact and extrusion, appearance of micro cracks, extending of dominating tensile cracks. And this proves the extrusion-tension theory of rock fragmentation by TBM cutters. When the cutters have the same penetration depth, and the angle and width of cutter rings become larger, the crash zone and the number of dominating tensile cracks enlarge, which means the cutter’s fragmentation ability is enhanced. Compared with the plain cutter rings, the wedge effect of wedge cuter rings is more remarkable, which make the radial tensile cracks extend faster and deeper in rock material. The damage of medial strength rock by cutters is more remarkable than the high and low strength rock.

Key words: TBM, cutter, rock fragmentation mechanism, particle flow method, numerical simulation

CLC Number: 

  • TU 443
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