Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (3): 111-120.doi: 10.6040/j.issn.1672-3961.0.2024.169

• Civil Engineering • Previous Articles    

Rock strength prediction based on scaled linear cutting test by disc cutter

GENG Qi1, LI Xiaobin1, HUANG Yufeng1, WANG Xuebin1*, YANG Mulin1, GUO Huichuan2, ZHANG Huijian3   

  1. GENG Qi1, LI Xiaobin1, HUANG Yufeng1, WANG Xuebin1*, YANG Mulin1, GUO Huichuan2, ZHANG Huijian3(1. Key Laboratory of Road Construction Technology and Equipment, Ministry of Education(Chang'an University), Xi'an 710064, Shaanxi, China;
    2. China Railway 18th Bureau Group Corporation Limited, Tianjin 300222, China;
    3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
  • Published:2025-06-05

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Abstract: In order to support geotechnical and rock sample selection in tunnel engineering and rock strength testing in on-site construction, the research used scaled linear cutting test to infer rock strength. A total of 9 batches of rock samples with uniaxial compressive strength of 50-230 MPa were collected from tunnel engineering sites and rock mines. Rod-shaped and block-shaped samples were prepared and subjected to uniaxial compression, Brazilian splitting and scaled linear cutting test respectively; selected 7 batches of test data to obtain the fitting functions of the uniaxial compressive strength, splitting tensile strength and normal force mean, peak value and peak mean value of the scaled linear cutting test, and used the remaining 2 batches of test results to verify the accuracy of the resulting prediction model. The results showed that the fitting correlation coefficients between rock uniaxial compressive strength and normal load were greater than 0.9, and the fitting correlation coefficients between splitting tensile strength and normal load were greater than 0.8, indicating that rock strength had a strong linear correlation with cutting load. The verification test found that when using the average normal force and the average peak value to verify, the error between the predicted value and the experimental value of the uniaxial compressive strength of the rock was less than 5%, and the error between the predicted value and the experimental value of the splitting tensile strength was less than 10%. It showed that the built model had high accuracy. Using the test methods and models proposed in this research, the strength of rock samples could be quickly and accurately estimated, which provided an effective means for rock sampling during indoor testing and rock strength assessment during on-site construction.

Key words: rock breaking by disc cutter, rock strength, linear cutting test, scaled test, predictive model

CLC Number: 

  • TU458+.3
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