黄金科学技术 ›› 2023, Vol. 31 ›› Issue (4): 605-612.doi: 10.11872/j.issn.1005-2518.2023.04.012
何玉龙1(),刘佳2,3,4,马凤山2,3(),李光2,3,郭捷2,3
Yulong HE1(),Jia LIU2,3,4,Fengshan MA2,3(),Guang LI2,3,Jie GUO2,3
摘要:
地面沉降作为一类缓变型地质灾害,可对人们的生产生活造成重要影响。三山岛金矿自2012年9月在地下采矿影响范围内建立全球定位系统(GPS)并监测地面沉降以来,监测到明显的地面沉降现象。分析结果表明:(1)多年来,研究区内地面沉降范围变化趋势较一致,沉降盆地分布于矿体的上盘区域,沉降盆地的形态由最初的近似圆形发展到后期的椭圆形,并沿矿体上盘方向发展演化;(2)沉降等值线在靠近F1控矿断裂一侧较密集,而在远离F1断裂一侧较稀疏,随着时间的推移,沉降中心区域的累积沉降值越来越大,根据累积沉降曲线斜率的变化情况,可将累积沉降量曲线划分为3个阶段;(3)三山岛金矿地面沉降的采矿影响因素主要有矿体赋存形态、埋深、地应力环境、断层活动和充填采矿方式等,而非采矿影响因素可归纳为人为社会因素,即由于采矿经济发展,建筑物增多,以及抽排地下水等,致使地面沉降现象也会有所加重。
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