A Case Study on Deformation Failure Characteristics of Overlying Strata and Critical Mining Upper Limit in Submarine Mining

Unlike land mining, the safety of seabed mining is seriously threatened by an overlying water body. In order to ensure subsea projects, it great importance understand failure characteristics and influencing factors strata deformation. Focusing on Sanshandao Gold Mine, a typical submarine deposit in China, geomechanical model testing numerical simulations were carried out. The results show that steeply dipping metal ore body, subsidence deformation mainly occurs hanging wall; center located surface wall, uplift upper critical limit, which represents minimum thickness reserved isolation pillar between seawater goaf, was determined be 50 m Xinli mine; fault slip would occur if this value exceeded. dip angle body negatively correlated with vertical As increased, limit increased. When footwall, increased as distance mode goaf slip. final changed combined rock collapse well These research provide theoretical basis for selection height area, reference safe practices under similar geological conditions.