铁路瓦斯隧道等级划分方法研究
匡 亮1,张俊云2, 张振强2
Research on the Classification Method of Railway Gas Tunnel
KUANG Liang1,ZHANG Jun-yun2, ZHANG Zhen-qiang2
铁道工程学报 . 2017, (8): 73 -77 .