Inversion Identification of Cracks for Underground Shield Tunnel Structure Based on HHO-XFEM

The crack damage of an underground shield tunnel structure is an important factor affecting its safety status. To evaluate the safety of the underground shield structure, based on the structure response measurement information, by using the new intelligent optimization algorithm [Harris hawks optimization (HHO) algorithm] and combining it with the extended finite-element method (XFEM) technology, a new HHO-XFEM method for reverse identification of shield tunnel structure cracks is proposed. By using both the static and dynamic analyses of the underground shield tunnel structure, the identification of a structure crack is studied. The results show that for the static analysis, the relative errors of inversed crack length and dip angle are 2.45% and 3.44%, respectively, and for the dynamic analysis, those errors are 6.92% and 3.00%, respectively. Therefore, the inversion identification effect of the new HHO-XFEM method is suitable.