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Study on Vibration Characterization Parameters of TBM Rock-breaking Cutterhead
(1. Key Laboratory of Urban Disaster Prevention and Mitigation of Ministry of Education, Beijing University of Technology,Beijing 100124; 2. China Construction Infrastructure Co., Ltd., Beijing 100037; 3. State Key Laboratory of Water and Sediment Science and Water Conservancy and Hydropower Engineering, Tsinghua University, Beijing 100084)
Abstract During the TBM rock breaking process, it is inevitable to generate strong vibration on the cutterhead. The vibration response of the cutterhead is the result of the interaction between rock and TBM, and it can serve as an important basis for rock mass identification and tunnelling parameter optimization. It is particularly important to obtain the information contained in this multi-source vibration signal of the cutterhead. Based on the TBM tunnelling test data, the influence of time on the distribution of vibration features is analyzed, a random forest model of multi-dimensional vibration features and tunnelling parameters is constructed, and the vibration features that can respond sensitively to changes in tunnelling parameters are screened through its feature importance evaluation function. The research results indicate that on-site vibration monitoring duration should reach at least one rotation period of the cutterhead, during which the distribution of various vibration characteristics tends to be stable. Peak factor and frequency standard deviation are the features that can best respond to changes in thrust and rotation speed, and can be used as key features for studying the relationship between vibration signal and change in tunnelling parameters.
Abstract：
During the TBM rock breaking process, it is inevitable to generate strong vibration on the cutterhead. The vibration response of the cutterhead is the result of the interaction between rock and TBM, and it can serve as an important basis for rock mass identification and tunnelling parameter optimization. It is particularly important to obtain the information contained in this multi-source vibration signal of the cutterhead. Based on the TBM tunnelling test data, the influence of time on the distribution of vibration features is analyzed, a random forest model of multi-dimensional vibration features and tunnelling parameters is constructed, and the vibration features that can respond sensitively to changes in tunnelling parameters are screened through its feature importance evaluation function. The research results indicate that on-site vibration monitoring duration should reach at least one rotation period of the cutterhead, during which the distribution of various vibration characteristics tends to be stable. Peak factor and frequency standard deviation are the features that can best respond to changes in thrust and rotation speed, and can be used as key features for studying the relationship between vibration signal and change in tunnelling parameters.
LIU Dongxin1 XIAO Yuhang2 ZHOU Xiaoxiong3 GONG Qiuming1 LIU Junhao1
.Study on Vibration Characterization Parameters of TBM Rock-breaking Cutterhead[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(4): 153-162
2023, Vol. 60 