Funding for this research was provided by:
Study on impact evaluation of Luojiazhai gas field on West Chongqing high speed railway project (Section 20-04-083)
Toxic and Harmful Gases in Tunnels in Metamorphic Rock Areas in Western Sichuan Plateau Research on Cause Mechanism and Evaluation Model (19YYJC1060)
Article History
Received: 1 November 2021
Accepted: 26 July 2022
First Online: 5 August 2022
Declarations
:
: The authors declare no competing interests.