›› 2018, Vol. 39 ›› Issue (7): 2699-2707.doi: 10.16285/j.rsm.2016.2389

• Numerical Analysis • Previous Articles     Next Articles

Numerical study of rock fragmentation by TBM cutters using general particle dynamics (GPD)

ZHAI Shu-fang1, ZHOU Xiao-ping2, 3, BI Jing2, 3   

  1. 1. College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou, Henan 450000, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China; 3. Department of Civil Engineering, Chongqing University, Chongqing 400045, China
  • Received:2016-10-11 Online:2018-07-10 Published:2018-08-05
  • Supported by:

    This work was supported by the Doctoral Scientific Research Foundation of Henan University of Technology(No. 2018BS005), the Fundamental Research Funds for the Central Universities (0903005203452), the National Program on Key Basic Research Project (973 Program) (2014CB046903) and the National Natural Science Foundation of China (51325903, 51279218).

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Abstract: In this paper, a general particle dynamics (GPD) was proposed to reveal the mechanism of rock fragmentation by TBM cutters. The GPD method is regarded as a novel meshless numerical method by introducing the particle failure criterion. The numerical models were established for intact rock fragmentation by a single TBM cutter and double TBM cutters using the GPD method, and the whole processes were successfully investigated. It was found that numerical results obtained by the GPD method were in good agreement with experimental results and previous numerical results, which verified the validity of GPD method for rock fragmentation by TBM cutters. Moreover, the GPD method was adopted to establish numerical models by considering the influences of joints and high confining pressure on rock fragmentation by TBM cutters. The results showed that the inclination angle of joints significantly affected the efficiency of TBM cutting, and the effects were quite different with increasing the inclination angle of joints. The high confining pressure greatly influenced the characteristics of crack initiation, propagation and even the depth of rock fragmentation by TBM cutters. Therefore, the GPD method demonstrates great potential to investigate rock fragmentation by TBM cutters.

Key words: general particle dynamics (GPD), tunnel boring machine (TBM), joints, confining pressure, rock fragmentation

CLC Number: 

  • O 242

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