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Abstract Xinli district of Sanshandao Gold Mine is the first subsea metal mine in China. Large-scale exploitation of the mine will certainly destroy the stability of rock masses，so it is necessary to study the rock mechanics-related problems in undersea metal mines. Based on the demands of undersea mining，the mechanical parameters of ore body and rock mass，the micro-structure and permeability of clay soil in the coastal deposit are measured and analyzed. The experimental modeling system of undersea metal mining is established. The reasonable and safe thickness of the isolation roof is obtained by the experimental simulation. The numerical modeling of the undersea metal mining is carried out to testify the accuracy of the experimental simulation. Using the Orthogonal test method，the optimal structure parameters in subsea mining are obtained by constructing a objective function based on the principle to keep the stability of rock masses. By optimizing the sequence of panel mining stope of ore block，the mining sequence of the “two stope panels” is applied for the mine. By the analysis of the mining condition of the deposit，such as the properties of ore and rocks，the inclination of ore bodies，etc.，a lower settlement frame cut-and-fill stope mining method has been proposed. The results from three years in-situ mining and field monitoring show that the reasonable and safe thickness of the isolation roof，the lower settlement frame stope hierarchical level filling mining method and in-situ real-time monitoring have provided the technical foundation for the safety of seabed mining.
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Received: 14 May 2010
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2010, Vol. 29 
