1. School of Science, Qingdao University of Technology, Qingdao 266520, China
2. School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China
3. Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
4. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China