Research on Evaluation of High-Quality Utilization Interval of TBM Thrust and Torque in Urban Subway Tunnels
In order to obtain the high-quality interval of TBM thrust and torque utilization rate,the tunneling data(thrust,torque,penetration,etc.)and rock strength of 17 TBM tunnels at home and abroad were collected,and the field penetration index(FPI)and torque penetration index(TPI)were introduced to analyze their relationship with thrust and torque utilization rate respectively.The utilization rate of thrust and torque of TBM is evaluated by the law between tunneling parameters(thrust,torque,penetration,etc.),rock strength,FPI,TPI and utilization rate of thrust and torque.It is found that the utilization rate of thrust has a high goodness of fit with the field penetration index and torque penetration index,and the correlation coefficient R2 is 0.85 and 0.74,respectively.It is concluded that the change of each parameter is relatively stable in the two ranges of thrust utilization rate of 0.15-0.6 and torque utilization rate of 0.15-0.5,which is the high-quality utilization range.Finally,the thrust is predicted by the tunnel geological survey data,and the average prediction error is 5.56%.Combined with the high-quality interval of thrust utilization rate,the maximum thrust is inversely calculated to offer guidance for the selection of the maximum total thrust of TBM and improve the adaptability of TBM.
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