1. Bai JB, Wang XY, Yao Z (2007) Study of coupling support in soft rock roadway under high stress. J China Univ Min Technol 36(4):421–425 (in Chinese)
2. Chen YP, Zhang SH (2003) Research on the best secondary support time of the soft rock roadway. Ground Pressure and Strata Control 2:56–58 (in Chinese)
3. Dong FT (1991) Support theory based on the broken rock zone in surround rock. In: Proceedings of the 2nd international symposium on mining technology and science, pp 1130–1137
4. Gao SM, Chen JP, Zuo CQ et al (2016) Structure optimization for the support system in soft rock tunnel based on numerical analysis and field monitoring. Geotech Geol Eng 34:1089–1099
5. Guo JX, Gao YT (2009) Analysis of protection time of tunnel based on displacement theoryof shotcrete and bolt support for weak surrounding rock. J Univ Sci Technol Liaoning 32(5):456–459 (in Chinese)