Abstract In order to study the variation law of TBM tunnelling parameters under ultra-small-radius turning condi? tions, the TBM-driven drainage gallery project of Jinyun Pumped Storage Power Station in Zhejiang Province is taken as an example for analysis. The TBM turning process is analyzed to find out that the adjustment amount of the shield is the main factor affecting the minimum turning radius of TBM. The forces on the disc cutters during rock breaking are analyzed to obtain the mechanism of interaction between the forces and various parameters. On the basis of on-site actual tunnelling data, the relationship among the penetration, thrust and torque of the TBM cutterhead under different rock uniaxial compressive strengths, rock mass integrity coefficients, and included angles between joint strike and tunnelling direction are analyzed. The analysis results show that under ultra-small-radius tunnelling conditions, the penetration increases logarithmically with the increase of thrust, and the torque increases exponentially with the increase of penetration, the increase rates being closely related to rock parameters. In addition,a prediction model for tunnelling parameters and rock parameters is established to carry out multiple groups of actual predictions for projects. The prediction results have an average relative error of less than 10%, indicating a high prediction accuracy of the prediction model.
Abstract：
In order to study the variation law of TBM tunnelling parameters under ultra-small-radius turning condi? tions, the TBM-driven drainage gallery project of Jinyun Pumped Storage Power Station in Zhejiang Province is taken as an example for analysis. The TBM turning process is analyzed to find out that the adjustment amount of the shield is the main factor affecting the minimum turning radius of TBM. The forces on the disc cutters during rock breaking are analyzed to obtain the mechanism of interaction between the forces and various parameters. On the basis of on-site actual tunnelling data, the relationship among the penetration, thrust and torque of the TBM cutterhead under different rock uniaxial compressive strengths, rock mass integrity coefficients, and included angles between joint strike and tunnelling direction are analyzed. The analysis results show that under ultra-small-radius tunnelling conditions, the penetration increases logarithmically with the increase of thrust, and the torque increases exponentially with the increase of penetration, the increase rates being closely related to rock parameters. In addition,a prediction model for tunnelling parameters and rock parameters is established to carry out multiple groups of actual predictions for projects. The prediction results have an average relative error of less than 10%, indicating a high prediction accuracy of the prediction model.
XIE Miao WANG Haonan LI Siyao TIAN Bo LIU Yafeng ZHANG Hongyu
.Study on TBM Tunnelling Parameters Under Ultra-small-radius Turning Conditions Based on Field Data[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(4): 58-66
2023, Vol. 60 