Relationships between tunneling parameters of TBM and rock chip characteristics based on image analysis

Authors

Xiao xiong ZHOU, School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaFollow
Yu hang XIAO, China Construction Infrastructure Corporation Ltd., Beijing 100037, China
Qiu ming GONG, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, ChinaFollow
Xiao li LIU, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Jun hao LIU, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
Dong xin LIU, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

Corresponding Author

GONG Qiu-ming

Abstract

Image analysis of rock chips is an important approach for TBM intelligent tunneling, and it can be used for real time evaluation of rock br eaking efficiency and optimization of tunneling parameters. In order to investigate the relationships between TBM tunneling parameters and rock chip characteristics, a multi step field tunneling test was carried out in an intact granite formation at a TBM construction section of Qingdao Metro Line 6. A rock chip image acquisition system was installed on the TBM to real time collect rock chip images. Then, the relationship between the tunneling parameters and the size and shape characteristics of rock chips obtained through image processing was analyzed. The results showed that the median particle size d50 , maximum particle size dmax and roughness index CI all present a positive correlation with thrust, torque and penetration, while a good negative correlatio n with FPI and SE . When the thrust exceeds a critical value for rock breaking , the increase in thrust will significantly increase d50 and CI , while dmax increases significantly only when the thrust exceeds a larger value. Besides, as the thrust increases, the shape of the large rock chips gradually becomes flattened and the aspect ratio increases. However, after the thrust reaches a certain level, the aspect ratio will remain stable. The results can provide a basis for real time optimiz ation of TBM tunnelin g parameters based on rock chip information.

Graphic Abstract

Recommended Citation

ZHOU, Xiao xiong; XIAO, Yu hang; GONG, Qiu ming; LIU, Xiao li; LIU, Jun hao; and LIU, Dong xin (2024) "Relationships between tunneling parameters of TBM and rock chip characteristics based on image analysis," Rock and Soil Mechanics: Vol. 45: Iss. 4, Article 7.
DOI: 10.16285/j.rsm.2023.5628
Available at: https://rocksoilmech.researchcommons.org/journal/vol45/iss4/7