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Differentiation and analysis on rock breaking characteristics of TBM disc cutter at different rock temperatures

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Abstract

In order to study rock breaking characteristics of tunnel boring machine (TBM) disc cutter at different rock temperatures, thermodynamic rock breaking mathematical model of TBM disc cutter was established on the basis of rock temperature change by using particle flow code theory and the influence law of interaction mechanism between disc cutter and rock was also numerically simulated. Furthermore, by using the linear cutting experiment platform, rock breaking process of TBM disc cutter at different rock temperatures was well verified by the experiments. Finally, rock breaking characteristics of TBM disc cutter were differentiated and analyzed from microscale perspective. The results indicate the follows. 1) When rock temperature increases, the mechanical properties of rock such as hardness, and strength, were greatly reduced, simultaneously the microcracks rapidly grow with the cracks number increasing, which leads to rock breaking load decreasing and improves rock breaking efficiency for TBM disc cutter. 2) The higher the rock temperature, the lower the rock internal stress. The stress distribution rules coincide with the Buzin Neske stress circle rules: the maximum stress value is below the cutting edge region and then gradually decreases radiant around; stress distribution is symmetrical and the total stress of rock becomes smaller. 3) The higher the rock temperature is, the more the numbers of micro, tensile and shear cracks produced are by rock as well as the easier the rock intrusion, along with shear failure mode mainly showing. 4) With rock temperature increasing, the resistance intrusive coefficients of rock and intrusion power decrease obviously, so the specific energy consumption that TBM disc cutter achieves leaping broken also decreases subsequently. 5) The acoustic emission frequency remarkably increases along with the temperature increasing, which improves the rock breaking efficiency.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Qing Tan  (谭青), Gui-ju Zhang  (张桂菊), Yi-min Xia  (夏毅敏) & Jian-fang Li  (李建芳)

  2. Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang, 422004, China

    Qing Tan  (谭青) & Yi-min Xia  (夏毅敏)

  3. State Key Laboratory of High Performance Complex Manufacturing, Changsha, 410083, China

    Gui-ju Zhang  (张桂菊)

Authors
  1. Qing Tan  (谭青)
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  2. Gui-ju Zhang  (张桂菊)
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  3. Yi-min Xia  (夏毅敏)
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  4. Jian-fang Li  (李建芳)
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Corresponding author

Correspondence to Gui-ju Zhang  (张桂菊).

Additional information

Foundation item: Projects(51274252, 51074180) supported by the National Natural Science Foundation of China; Project(2013CB035401) supported by the National Basic Research Program of China; Projects(2012AA041801, 2012AA041803) supported by the High-Tech Research and Development Program of China

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Tan, Q., Zhang, Gj., Xia, Ym. et al. Differentiation and analysis on rock breaking characteristics of TBM disc cutter at different rock temperatures. J. Cent. South Univ. 22, 4807–4818 (2015). https://doi.org/10.1007/s11771-015-3032-6

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  • DOI: https://doi.org/10.1007/s11771-015-3032-6

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