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首页> 外文期刊>Tunnelling and underground space technology >Analysis on the crown convergence deformation of surrounding rock for double-shield TBM tunnel based on advance borehole monitoring and inversion analysis
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Analysis on the crown convergence deformation of surrounding rock for double-shield TBM tunnel based on advance borehole monitoring and inversion analysis

机译：基于预先钻孔监测和反演分析的双屏蔽TBM隧道颈冠收敛变形分析

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摘要

The surrounding rock deformation during tunnelling is difficult to be measured or calculated accurately, especially in tunnels constructed by double-shield TBM. A method for prediction of the crown convergence deformation of surrounding rock based on advance borehole monitoring and numerical inversion analysis is proposed. Combined with the field deformation monitoring and numerical simulation, the final crown convergence deformation of surrounding rock is obtained. When TBM advances to the test section, the horizontal directional drilling machine is used to drill an advance borehole at the top of tunnel and 1.6 m away from the tunnel face, and the measuring tube with fiber Bragg grating (FBG) sensors has been installed in the borehole to conduct the deformation monitoring. Then, based on the numerical simulation with the viscoplastic creep constitutive model, the final crown deformation of surrounding rock during TBM tunneling process has been predicted, in which the parameters of surrounding rock are obtained through the inversion analysis of deformation data and the error caused by the displacement of reference point has been corrected. The surrounding rock crown convergence deformation was also estimated by using a scaled instrument in the grout hole of lining segment and is approximately the same with the above predicted value, which show that the proposed method can well analyze the surrounding rock crown convergence deformation during tunneling for double-shield TBM tunnels.
机译：隧道期间的周围岩石变形难以精确地测量或计算，尤其是由双屏蔽TBM构造的隧道。提出了一种基于预先钻孔监测和数值反演分析的基于预先钻孔监测来预测周围岩石的皇冠收敛变形的方法。结合现场变形监测和数值模拟，获得了周围岩石的最终皇冠收敛变形。当TBM进入试验部分时，水平定向钻孔机用于钻孔顶部的预先钻孔，远离隧道面1.6米，并安装了带有光纤布拉格光栅（FBG）传感器的测量管钻孔进行变形监测。然后，基于粘塑蠕变本构型模型的数值模拟，已经预测了在TBM隧道过程中周围岩石的最终冠状变形，其中通过变形数据的反演分析获得了周围岩石的参数和由误差引起的误差获得参考点的位移已经纠正。还通过在衬砌段的灌浆孔中使用缩放仪器来估计周围的岩冠会聚变形，并且与上述预测值大致相同，这表明所提出的方法可以很好地分析隧道期间的周围岩冠会聚变形双屏蔽TBM隧道。

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