The distributions of the principal stresses, displacements, plastic zones and pore pressures in the crown pillar are obtained by simulating the cut-and-fill stoping method at different excavation levels (above level −115 m). The numerical analysis is carried out by FLAC 3D, in which the influences of sea water pressure as well as mining sequences have been considered. A realistic geometric subsea gold mine is modelled by integrating the usage of SURPAC and FLAC 3D. In this paper, the minimum required thickness of crown pillar is determined based on 3D numerical modelling and analysis. Since the mining activities are carried out under sea, it is of vital importance to maintain the stability of the crown pillar and to keep the sea water out from the excavations.
Sanshandao gold mine, located at the east coastline of Bohai Sea in the Shandong Province, is the first subsea metal mine in China.
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