Failure Characteristics of Rock Sample during Penetration Tests with the Assistance of Different Free Surface Combinations | Zendy

Futong Xu | Zendy; Jingjing Lu | Zendy; Hui Zhou | Zendy; Jiancheng Xiao | Zendy; Yang Gao | Zendy

Open Access

Failure Characteristics of Rock Sample during Penetration Tests with the Assistance of Different Free Surface Combinations

Author(s) -

Futong Xu,

Jingjing Lu,

Hui Zhou,

Jiancheng Xiao,

Yang Gao

Publication year - 2022

Publication title -

lithosphere

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.737

H-Index - 43

eISSN - 1941-8264

pISSN - 1947-4253

DOI - 10.2113/2022/6216548

Subject(s) - free surface , geology , penetration (warfare) , rock mass classification , surface energy , surface (topology) , geotechnical engineering , penetration depth , materials science , composite material , mechanics , geometry , engineering , optics , physics , mathematics , operations research

Free surface-assisted TBM disc cutter for rock breaking is an important direction for the optimizing of TBM cutter structure. To study the influence of free surface on TBM excavation, the free surfaces of limited-width opening and unlimited-width opening were presented, and six different free surface combinations were proposed. The penetration tests of sandstone with different free surface combinations were carried out. The results showed that the rock mass adjacent to the free surface of unlimited-width opening fell off after sample fracture. The rock mass adjacent to the free surface of limited-width opening caused the free surface to close after the rock broke. Under different free surface combinations, the auxiliary effect for rock breaking was not obvious when the free surface depth was shallow, and the failure morphology of the sample changed from vertical splitting to inclined fracture with the increase of free surface depth. The free surface-assisted rock-breaking method can reduce energy consumption during rock breaking. Among all combinations, the cumulative energy before peak load of the SDL sample dropped the most to 37.62% of the intact sample. Finally, the free surface combinations can affect the design of the cutter layout of TBM.

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