[Wu, Kuan; Yao, Qi; Zhao, Yun; Wu, K; Xi, Chaozhuang] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Hunan, Peoples R China.
[Wang, Qiao; Chen, Yong] Hunan Univ Sci & Technol, Coll Resources Environm & Safety Engn, Xiangtan, Hunan, Peoples R China.
[Chen, Yong] Key Lab Gas & Roof Disaster Prevent & Control Safe, Xiangtan, Hunan, Peoples R China.
[Chen, Yong] Chongqing Res Inst, China Coal Technol Engn Grp, Chongqing, Peoples R China.
[Zhao, Pengtao] Hunan Gas Control & Utilizat Engn Res Ctr Co Ltd, Changsha, Peoples R China.