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| Vibration characteristics of a TBM main beam under different surrounding rocks and tunneling parameters |
| YANG Yalei1，DU Lijie2，LI Qingwei1，WEI Fei3，ZHANG Xiongwei4，ZHAO Xiangbo3，WANG Zhe3，LIU Yang4 |
1.School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2.Collaborative Innovation Center for Performance and Safety of Large-scale Infrastructure, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
3.Xinjiang Erqis River Basin Development and Construction Administration Bureau, Urumqi 830000, China;
4.Sinohydro Bureau 6 Co., Ltd., Shenyang 110179, China |
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Abstract Relying on a major water conservancy tunnel project in Xinjiang, a full-face rock tunnel boring machine (TBM) is being drilled, and the field test of TBM main beam vibration under different working conditions is carried out. Through time domain and frequency domain, the vibration characteristics of main beam of TBM under different surrounding rock and different tunneling parameters are comprehensively analyzed. The results show that the change of vibration acceleration of main beam can accurately reflect the working cycle process of TBM starting, stable tunneling, stopping and changing steps;With the increase of the excitation source distance, the vibration of the main beam shows a fluctuation attenuation, but the axial vibration fluctuation is small, the attenuation amplitude is 36.68%, followed by transverse, vertical attenuation is the largest, up to 81.88%.The vertical vibration of main beam caused by tunneling thrust is larger than the axial and transverse vibration. The fluctuation range of the effective value of axial acceleration is -5~+5m/s2, horizontal acceleration is -3~+3m/s2 and vertical acceleration is -10~+10m/s2. Geological conditions (rock integrity and the uniaxial compressive strength, etc.) have a great influence on the main beam vibration.The key tunneling parameters of TBM are cutter-head speed (n), penetration (P) and thrust (F), which are significantly correlated with the vibration of the main beam. The vibration frequency of the main beam is generally distributed below 150 Hz. Under different tunneling conditions, vibration peaks may appear at some frequency points in the three directions simultaneously, indicating that there is a coupling vibration in different directions.The field test reveals the vibration characteristics of the main beam of TBM under different surrounding rock and different tunneling parameters, which provides test data and theoretical basis for the structural analysis of TBM main beam, the optimization of TBM tunneling parameters and the identification of geological conditions.
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Received: 07 May 2022
Published: 28 June 2023
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