1. AnHui Provincial Key Laboratory of Intelligent Underground Detection, College of Civil Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China
2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
3. Green Mining Engineering Technology Research Center of Anhui Province, Exploration Research Institute, Anhui Provincial Bureau of Coal Geology, Hefei 230088, China
4. School of Architecture & Urban Planning, Anhui Jianzhu University, Hefei, Anhui 230601, China