三山岛金矿海底开采F1断裂防突结构可能的破坏形式分析

不同矿山具有不同的突水形式和突水机制，对于完全位于海底之下的三山岛金矿新立海底矿区，其水文地质条件、围岩力学属性、矿体形态及其与断层的相对位置决定了其突水机制不同于其他矿山尤其是煤矿常见的突水机制。新立矿区防突结构可能的破坏形式与矿体顶部第四系黏土隔水层以及F1断裂带断层泥隔水带紧密相关，顶板隔离层破断突水和F1的滑动突水是目前可能的突水模式。针对海底矿床开采特有的水文地质结构，在阐明防突结构本质属性的基础上，采用数值模拟手段，分析了不同开采工况下F1断裂防突结构可能的破坏形式。模拟结果表明，当开采规模不大时，F1断层滑动范围仅局限在采空区附近，对顶板隔离层部位F1不会产生影响；但随着海底开采规模的扩大，顶板隔离层部位的F1最终会产生滑动。

Analysis on the Possible Failure Modes of Water Burst Prevention Structures of F1 Fault Caused by Undersea Mining in Sanshandao Gold Mine

Different mines generally have different water-inrush forms and mechanisms.Xinli mining area locates under sea floor，of Sanshandao gold mine.Some factors，such as hydrogeological condition，surrounding rock mechanics properties，orebody morphology，and the relative position to default decided water inrush mechanism which is different from that of other mines especially coal mine.The possible failure modes of seawater burst prevention structures are closely associated with the Quaternary clay aquiclude on top of orebody and the fault gouge aquiclude of F1.So the isolation layer breaking and the fault slipping of F1 now are the possible water-inrush modes of Xinli mining area.Based on illuminating the essential attributes of the water burst prevention structures，and combined with proper hydrogeological structures of the Xinli seabed mine exploitation.Analysis of the possible failure modes of F1 in different working conditions were carried out by numerical simulation，The simulation results showed that when the mining scale of Xinli orebody was small，the slip range of F1 was limited in the scope near the mined area and had no effect on the section of F1 where penetrating the reserved isolation layer.But with the increase of mining scale，F1 near the isolation layer would terminally slide.