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Full-Scale Linear Cutting Tests in Chongqing Sandstone to Study the Influence of Confining Stress on Rock Cutting Forces by TBM Disc Cutter

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Abstract

In order to study the influence of confining stress on rock cutting forces by tunnel boring machine (TBM) disc cutter, full-scale linear cutting tests are conducted in Chongqing Sandstone (uniaxial compressive strength 60.76 MPa) using five equal biaxial confining stressed conditions, i.e. 0-0, 5-5, 10-10, 15-15 and 20-20 MPa; disc cutter normal force, rolling force, cutting coefficient and normalized resultant force are analysed. It is found that confining stress can greatly affect disc cutter resultant force, its proportion in normal and rolling directions and its acting point for the hard Chongqing Sandstone and the confining stress range used in this study. For every confining stressed condition, as cutter penetration depth increases, disc cutter normal force increases with decreasing speed, rolling force and cutting coefficient both increase linearly, and acting point of the disc cutter resultant force moves downward at some extent firstly and then upward back to its initial position. For same cutter penetration depth, as confining stress increases, disc cutter normal force, rolling force, cutting coefficient and normalized resultant force all increase at some extent firstly and then decrease rapidly to very small values (quite smaller than those obtained under the non-stressed condition) after some certain confining stress thresholds. The influence of confining stress on rock cutting by TBM disc cutter can be generally divided into three stages as confining stress increases, i.e. strengthening effect stage, damaging effect stage and rupturing effect stage. In the former two stages (under low confining stress), rock remains intact and rock cutting forces are higher than those obtained under the non-stressed condition, and thus rock cutting by TBM disc cutter is restrained; in the last stage (under high confining stress), rock becomes non-intact and rock slabbing failure is induced by confining stress before disc cutting, and thus rock cutting by TBM disc cutter is facilitated. Meanwhile, some critical values of confining stress and cutter penetration depth are identified to represent the changes of rock cutting state. This study provides better understanding of the influence of confining stress on disc cutter performance and can guide to optimize the TBM operation under stressed condition.

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Fig. 1

Redrawn from Gong et al. (2016b)

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Original data from Ma et al. (2016a, b)

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Original data from Ma et al. (2016a, b)

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Acknowledgements

This work was financially supported by National Key Basic Research Program of China under Grant Nos. 2014CB046904 and 2015CB058102, China Postdoctoral Science Foundation Program under Grant No. 2017M622515, and National Funded Program for Graduate Students Studying Abroad of China Scholarship Council under Grant No. 201506270068 (to Miss Xiaoxuan Kong). The authors are grateful for their continuous support, and also to the authors’ colleagues for their valuable help in organizing and improving this article, especially to Mr. Qi Liu in Wuhan University and Mr. Shuai Ma in Beijing University of Technology. Prof. Qiuming Gong’s postgraduates in Beijing University of Technology are sincerely acknowledged for helping the authors prepare the rock samples and conduct the linear cutting tests.

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Authors and Affiliations

  1. Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, Hubei, People’s Republic of China

    Yucong Pan, Quansheng Liu & Xiaoxuan Kong

  2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, People’s Republic of China

    Yucong Pan, Jianping Liu & Xingxin Peng

  3. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Yucong Pan, Jianping Liu & Xingxin Peng

  4. College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an, 625014, Sichuan, People’s Republic of China

    Jianping Liu

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  1. Yucong Pan
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Correspondence to Quansheng Liu.

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Pan, Y., Liu, Q., Liu, J. et al. Full-Scale Linear Cutting Tests in Chongqing Sandstone to Study the Influence of Confining Stress on Rock Cutting Forces by TBM Disc Cutter. Rock Mech Rock Eng 51, 1697–1713 (2018). https://doi.org/10.1007/s00603-018-1412-6

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