Effect of rolling angle on segment cracking and damage of shield tunnel - field investigation and modelling

Abstract

Based on a curved shield tunnel, this study classified the grades of segment cracking and damage during the construction and counted the segment cracking and damage. Combined with the data of tunnelling parameters, the significance of segment cracking and damage factors was analysed by the ordered multi-classification logistic regression method. Furthermore, the refined finite element numerical model was established to study the damage mechanism of the segment under the rolling angle. The results indicate that the analysis results of numerical simulation correspond to the field phenomena, which confirms that the rolling angle is a critical factor affecting the segment disease. The total stiffness of the segment attenuates significantly after torsion. When the torque is 43580.17 kN·m, the maximum longitudinal bolt stress connecting the segment out of the shield shell and the segment in the shield shell reaches 619.6 MPa, close to 640 MPa of the bolt yield stress.