废弃露天坑下复杂隐伏空区群综合探测及数字化建模

Comprehensive Detection and Digital Modeling of Complex Hidden Goaf Groups Under Abandoned Open Pits

采用尾砂充填露天坑能够实现废弃露天坑地质灾害治理与尾矿综合利用的双重目的。针对废弃露天坑下隐伏空区群对露天转地下隔离矿柱安全稳定性影响大的问题,提出了废弃露天坑下复杂隐伏空区群综合探测及数字化建模技术。以大冶大红山矿为例,采用等值反磁通瞬变电磁法和微动地震法等综合物探方法,结合采空区现场调查成果,综合推断圈定了隐伏采空区20个,并通过布置钻孔验证了结果的准确性;采用GOCAD软件构建了露天坑地表与采空区综合地质体数字化模型,展现了采空区群空间赋存特性,测算出采空区体积共计55350.64 m^(3),为露天坑隐伏空区群安全隐患治理与隔离矿柱的稳定性分析提供了支撑。

Using tailings to fill open pits can achieve the dual purposes of geological hazard control of abandoned open pits and comprehensive utilization of tailings.The hidden goaf groups under abandoned open pits have a great impact on the safety and stability of isolation pillars during open-pit mining transferring to underground mining.Aiming at this problem,a comprehensive detection and digital modeling technology for complex hidden goaf groups under abandoned open pits was proposed.Taking Dahongshan Mine in Daye as an example,the comprehensive detection technology combing the equivalent diamagnetic flux transient electromagnetic method and the microseismic method was used.Combined with the field investigation results of goafs,20 hidden goafs were comprehensively inferred and delineated,and the accuracy of the results was verified by arranging boreholes.The GOCAD software was used to build digital model for the comprehensive geological body of the surface and the goafs,which showed the spatial occurrence characteristics of the goaf groups,and the volume of the goafs was calculated as about 55350.64 m^(3).The study can provide a support for the treatment of hidden hazards in the open pits and the stability analysis of the isolated pillars.