@article{bai_guan_tang_florez-lopez_2020,  title={Strain-degradation analysis of tunnel structures based on twin-shear unified strength criterion},  volume={17},  ISSN={1679-7825},  url={https://doi.org/10.1590/1679-78255769},  DOI={10.1590/1679-78255769},  number={2},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Bai, Yongtao and Guan, Shaoyu and Tang, Zhenyun and Florez-Lopez, Julio},  year={2020},  pages={e251} }