[1] School of Energy, Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi'an University of Science and Technology, Xi'an,710054, China
[2] Zhongmei Xi'an Design Engineering Co Ltd, Xi'an,710054, China
[3] Shenmu Zhangjiamao Mining Co Ltd, Shaanxi Coal Group, Shenmu,719300, China