Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (4): 981-994.doi: 10.16285/j.rsm.2021.6025

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Study on milling process and optimization of pick entry sequence of double-wheel trench cutter

XIAO Jian-cheng1, 2, ZHOU Hui1, 2, LU Jing-jing1, 2, FENG Chun3, XU Fu-tong1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
  • Online:2022-04-11 Published:2022-06-09
  • Contact: ZHOU Hui, male, born in 1972, PhD, Professor, PhD supervisor, research interests: rock mechanics and rock engineering. E-mail: E-mail:
  • About author:XIAO Jian-cheng, male, born in 1996, PhD candidate, research interests: rock mechanics and numerical simulation.
  • Supported by:
    the National Natural Science Foundation of China (41941018), the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (ZDBS-LY-DQC022), the Science and Technology Service Network Initiative of the Chinese Academy of Sciences (KFJ-STS-QYZD-174) and the China Huaneng Group Technology Project (HNKJ19-H14).


Double-wheel trench cutter is a professional construction equipment of underground diaphragm wall, and its tooth arrangement system is its core component. The parameter design of tooth arrangement system is closely related to rock breaking performance. In this study, a three-dimensional simulation method for milling rock and soil with milling wheel is developed using the continuum-discontinuum element method (CDEM). On this basis, considering the correlation between free surface and milling, the mechanism of the influence of cutting sequence on rock breaking performance of tooth arrangement system is studied, and a numerical generalization model of rock entry sequence is established under the condition of associated milling, in which the number of adjacent free surfaces is preset as the main influencing factor. The results show that: (1) The curves of milling force and milling depth obtained by milling wheel milling rock and soil mass verify the correctness of the numerical simulation method. (2) Compared with the intact rock mass, the peak load of rock samples with single adjacent preset free surface and double adjacent preset free surface decreased by 32.5% and 68.2% respectively, and the energy consumption of rock breaking decreased by 19.8% and 56.6%, respectively. (3) In the tooth arrangement system, the larger the ratio of the number of pick against double adjacent preset free surfaces to the total number of picks, the lower the overall energy consumption of the tooth arrangement system, and the energy consumption of the heterogeneous tooth arrangement system is lower than that of the sequential one. The research results provide a basis for improving the rock breaking process and tooth arrangement system optimization of double-wheel trench cutter.

Key words: double-wheel trench cutter, tooth arrangement system, optimization and application, continuum-discontinuum element method (CDEM)