Modifying Methods for Surrounding Rock Grade of Karst Tunnel

TONG Jianjun, GUI Dengbin, WANG Mingnian, LI Zhi′an, LYU Zhizhou, ZHAO Daming

Tunnel Construction . 2021, (S1): 99 - . DOI: 10.3973/j.issn.2096-4498.2021.S1.013