›› 2011, Vol. 32 ›› Issue (6): 1891-1897.

• Numerical Analysis • Previous Articles     Next Articles

Numerical simulaiton of influence factors for rock fragmentation by TBM cutters

SUN Jin-shan1, 2, CHEN Ming3, CHEN Bao-guo1, 2, LU Wen-bo3, ZHOU Chuan-bo1   

  1. 1. Engineering Research Center of Rock-Soil Drilling & Excavation and Protection of Ministry of Education, China University of Geosciences (Wuhan), Wuhan 430074, China; 2. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China; 3. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
  • Received:2007-09-21 Online:2011-06-10 Published:2011-06-21

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2008

Abstract: The cutterhead and rock mass characteristics affect the excavation efficiency of full face rock tunnel boring machine (TBM) strongly. The numerical models are made by the particle flow code method (PFC2D) to simulate the rock fragmentation under TBM disc cutters. Numerical simulation tests show that some factors influence the rock fragmentation process strongly. In the relative weak rocks, the regular tension cracks and the big mucks form more easily, when the disc cutters penetrate rocks alternately; in hard rocks, the formation of small disc shape mucks depends on the lateral extrusion of cutter rings. Under the double disc cutters, the rocks crush more easily because of the tension stress which comes form strong compression of cutters, and the disc shape mucks only form in very hard rocks. There is optimal cutter spacing for different strength rocks, which increase with rock strength decreases. In the process of rock fragmentation, discontinuities control the propagation process of cracks and obstruct the cracks spread to the underside of discontinuities. The discontinuities will guide the cracks spread deep in rocks, when the angle of cut-in direction and discontinuity decreases. And the discontinuities will guide the cracks spread transversely when the angle increases

Key words: tunnel boring machine(TBM), cutter, rock fragmentation, particle flow code method, numerical simulation

CLC Number: 

  • TU 443
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