Key Laboratory of Gas Hydrate;
Ministry of Natural Resources;
Laboratory for Marine Mineral Resource;
Pilot National Laboratory for Marine Science and Technology (Qingdao);
Qingdao Institute of Marine Geology;
China Geological Survey;
College of Information and Control Engineering;
China University of Petroleum;
piezocone; penetration; test; hydrate; exploitation; test; undrained; shear; strength; calcareous; clay; Shenhu; area; South; China; Sea;