三山岛北部海域金矿大规模海下开采地表岩移预测分析

三山岛北部海域金矿赋存于海平面下,设计生产能力达到12 000t/d,水下开采技术难度大,若矿体开采强度过高、顶柱隔离层保留不足,将可能造成海床沉降变形,引发海水倒灌的风险。根据矿床开采技术条件,在获取有限岩石力学参数条件下,本次采用软件模拟分析了海下矿床上向充填法开采条件下的地表岩移特征。研究结果表明,地表沉降变形最大值分布于矿体上盘区域,随着开采由深部逐渐转入浅部区域,地表沉降变形不断增大,研究建议留设160m顶柱,能够保证海下矿体安全开采。

Analysis of surface movement with large-scale mining in Sanshandao Northern sea area gold Mine

Sanshandao northern sea area gold mine is a submarine deposit with designed productive capacity of 12000 t/d. Submarine mining is technically difficult and always comes with high-risk. High-intensity submarine mining and the poor crown pillar will cause seabed subsidence deformation, further leading to a huge risk of underground mine seawater intrusion. According to the mining technical conditions of Sanshandao northern and under the limited rock mechanics parameters, the surface movement in Sanshandao northern with upward filling mining method were simulated and analyzed by numerical simulation. The study showed that the maximum value of surface subsidence was mainly distributed in the region of hanging wall. With the mining of ore-body from deep to the shallow area, the surface subsidence deformation increased constantly. It was suggested that 160 m crown pillar should be reserved to ensure the safety of submarine mining.