Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (5): 1363-1372.doi: 10.16285/j.rsm.2020.1468

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on combined rock-breaking mode of pre-cutting groove and TBM mechanical cutter

XU Fu-tong1, 2, LU Jing-jing1, 2, ZHOU Hui1, 2, XIAO Jian-cheng1, 2, ZHANG Chuan-qing1, 2, QIU Hao-quan1, 3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing, 100049, China; 3. College of Civil Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China
  • Received:2020-09-28 Revised:2021-01-14 Online:2021-05-11 Published:2021-05-08
  • Supported by:
    This work was supported by the Key Research Program of Frontier Sciences(ZDBS-LY-DQC022), the National Natural Science Foundation of China (NSFC)(41941018) and the Hubei Province Natural Science Foundation Innovation Group(2018CFA013).

PDF (Chinese)

308

Abstract: The traditional rock-breaking mode of mechanical-rock interaction can no meet the requirement of large improvement of tunneling efficiency of TBM. Innovative rock-breaking technology and its rock-breaking mechanism have gradually been paid more and more attention. On the premise of not changing the main structure of TBM, the penetration test using TBM constant cross-section hob indenter has been carried out on rock samples with three different lithology under lateral constraint conditions. The influence of pre-cutting groove on rock-breaking mode of mechanical cutter are studied. The results show that: (1) Pre-cutting groove can reduce the normal load of indenter when the rock sample is broken, and the normal load of the rock sample with pre-cutting groove is reduced by 44.13%-53.05% compared with that without groove. The lower the uniaxial compressive strength of the rock is, the larger the reduction ratio of normal load will be. (2) There is a critical value for the influence of pre-cutting groove depth on the normal load when the rock sample is broken. Beyond this critical value, the influence of pre-cutting groove depth on the failure behavior of the rock sample is weakened. Based on the above investigations, a new combined rock-breaking mode of pre-cutting groove and mechanical cutter is proposed, and an innovative rock breaking technology that can realize pre-cutting groove is discussed. The combined rock-breaking mode can break through the bottleneck of rock-breaking efficiency and is of great significance for TBM equipment upgrading and major engineering project construction.

Key words: pre-cutting, TBM mechanical cutter, rock-breaking mode, rock-breaking technology, combined rock breaking

CLC Number: 

  • TU 452，P 634.1
[1] WANG Xiu-ying, ZHANG Zhen, LU He-lin , ZHOU Ming-liang . A study of ground deformation when excavating tunnel in soil by Mechanical pre-cutting method [J]. , 2005, 26(1): 140-144.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] TAO Gan-qiang, YANG Shi-jiao, REN Feng-yu. Experimental research on granular flow characters of caved ore and rock[J]. , 2009, 30(10): 2950 -2954 .
[2] ZHANG Wen-jie，CHEN Yum-min. Pumping tests and leachate drawdown design in a municipal solid waste landfill[J]. , 2010, 31(1): 211 -215 .
[3] GONG Wei-li, AN Li-qian, ZHAO Hai-yan, MAO Ling-tao. Multiple scale characterization of CT image for coal rock fractures based on image description[J]. , 2010, 31(2): 371 -376 .
[4] WANG Ming-nian, GUO Jun, LUO Lu-sen, Yu Yu, Yang Jian-min, Tan Zhon. Study of critical buried depth of large cross-section loess tunnel for high speed railway[J]. , 2010, 31(4): 1157 -1162 .
[5] TAN Feng-yi, Jiang Zhi-quan, Li Zhong-qiu, YAN Hui-he. Application of additive mass method to testing compacted density of filling material in Kunming new airport[J]. , 2010, 31(7): 2214 -2218 .
[6] CHAI Bo, YIN Kun-long, XIAO Yong-jun. Characteristics of weak-soft zones of Three Gorges Reservoir shoreline slope in new Badong county[J]. , 2010, 31(8): 2501 -2506 .
[7] YANG Zhao-liang, SUN Guan-hua, ZHENG Hong. Global method for stability analysis of slopes based on Pan’s maximum principle[J]. , 2011, 32(2): 559 -563 .
[8] WANG Guang-jin，YANG Chun-he ，ZHANG Chao，MA Hong-ling，KONG Xiang-yun ，HO. Research on particle size grading and slope stability analysis of super-high dumping site[J]. , 2011, 32(3): 905 -913 .
[9] HU Hai-jun, JIANG Ming-jing, ZHAO Tao, PENG Jian-bing, LI Hong. Effects of specimen-preparing methods on tensile strength of remolded loess[J]. , 2009, 30(S2): 196 -199 .
[10] LI Min，CHAI Shou-xi，WANG Xiao-yan，WEI Li. Examination of reinforcement effect on basis of strength increment of reinforced saline soil with wheat straw and lime[J]. , 2011, 32(4): 1051 -1056 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd