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

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• 作者：Qing Tan ; Gui-ju Zhang ; Yi-min Xia …
• 关键词：tunnel boring maching (TBM) ; disc cutter ; rock temperature ; rock breaking characteristic ; numerical simulation
• 刊名：Journal of Central South University
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：22
• 期：12
• 页码：4807-4818
• 全文大小：2,331 KB
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• 作者单位：Qing Tan (1) (2)
  Gui-ju Zhang (1) (3)
  Yi-min Xia (1) (2)
  Jian-fang Li (1)
  
  1. College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China
  2. Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang, 422004, China
  3. State Key Laboratory of High Performance Complex Manufacturing, Changsha, 410083, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223

文摘

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. Key words tunnel boring maching (TBM) disc cutter rock temperature rock breaking characteristic numerical simulation