Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (4): 70-79.doi: 10.6040/j.issn.1672-3961.0.2019.744

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Numerical simulation of rock fragmentation process by TBM cutter in double-joint rock mass

SHI Xuesong1, GUAN Qingzheng2, WANG Wenyang1, XU Zhenhao1, LIN Peng1*, WANG Xiaote1, LIU Jie1   

  1. 1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China;
    2. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Published:2020-08-13

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Abstract: Effects of joint characteristics on rock fragmentation process by full-face rock tunnel boring machine(TBM)disc cutter was studied by numerical simulation using the particle discrete element method. A numerical model including double-joint rock mass and a disc cutter was established. 30 sets of numerical simulation tests with different joint spacing and joint angle were carried out to explore the failure modes of rock mass, study the variations of peak value of vertical contact force of cutter with joint spacing and joint angle, and analyze the characteristics of microscopic cracks growth during the rock fragmentation process. Results showed that four rock fragmentation modes were proposed as the joint characteristics changes; the peak value of vertical contact force of cutter first decreased and then increased with joint angle, and the minimum value was at 30° or 45° and the maximum value was at 90°; the peak value of vertical contact force of cutter generally increased with joint spacing; the amount of microscopic cracks was related to the vertical contact force of cutter and the relation was divided into three stages. These conclusions had certain guiding significance for the rational design of TBM cutter and TBM construction.

Key words: tunnel boring machine(TBM), rock fragmentation, particle flow simulation, jointed rock mass, fragmentation mode

CLC Number: 

  • U453
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