微动方法在金属矿采空区三维探测中的应用——以安徽霍邱县某铁矿采空塌陷区为例  

Application of Microtremor Detection Method in the 3D Survey of Metal Mined-out Collapse area:An Example of Iron Mined-out Collapse Area in Huoqiu County,Anhui Province

作　　者：廖圣柱[1,2] 万子轩 贾慧涛 LIAO Sheng-Zhu;WAN Zi-Xuan;JIA Hui-Tao(Anhui Institute of Geophysical and Geochemical Prospecting Techniques,Hefei 230031,Anhui,China;Anhui Shallow Surface Geophysical Engineering Research Center,Hefei 230031,Anhui,China)

机构地区：[1]安徽省地球物理地球化学勘查技术院,安徽合肥230031 [2]安徽省浅地表地球物理工程研究中心,安徽合肥230031

出　　处：《华南地质》2023年第4期643-654,共12页South China Geology

基　　金：安徽省自然资源厅科技项目(编号:2022-K-13)。

摘　　要：地下金属矿产的持续开采会形成大面积的采空区,采空区的塌陷和沉降将直接危害人民生命财产安全。金属矿采空区埋藏深度往往较大,形态特征和地质环境复杂,导致其难以有效探测,因此,针对其探测方法的研究具有很大的现实意义。本文以安徽霍邱地区某铁矿采空塌陷区为研究对象,选用微动探测方法对该区域地下采空塌陷情况进行勘查;利用噪声源聚束方法分析了工区内可能的干扰源,探究了周边人类活动对本次探测结果可能造成的影响;开展了剖面勘探试验,将频散曲线反演得到的速度剖面与已知地质剖面进行对比,验证了探测方法的有效性;对所有测点数据进行插值计算构建了地下三维横波速度结构,利用速度差异刻画了地下采空塌陷区的空间形态与展布,推断已知塌陷区的地层稳定性并圈定两个隐伏灾害区域。探测结果表明,微动探测方法对于金属矿采空塌陷区探测具有良好的技术优势和应用前景,可为本区后续的综合治理提供地球物理依据。The continuous extraction of underground metal minerals would form a large mined-out area,and the collapse and subsidence of this area would pose a direct threat to the safety of people's lives and property.The deep buried depth,complicated geological environment and morphological characteristics make it a challenge to detect the area effectively.Therefore the research on its detection technology is of great practical significance.In this paper,an underground mined-out collapse area in an iron deposit in Huoqiu County,Anhui Province has been studied.The microtremor detection method was used to investigate the mining situation in this area,the possible sources of interference in the area were located and analyzed by using the noise source beamforming method,and the influence of the surrounding human activities on the results of this detection is investigated.The validity of the detection method used was verified;the three-dimensional shear wave velocity structures were constructed by interpolating the data from all the measured points;the spatial distribution of the underground mined-out collapse area and faults was depicted by using the shear wave velocity difference,that the stratigraphic stability of the known mined-out area was deduced and two hidden geological hazard areas were speculated.The survey results show that the microtremor detection method has good technical advantages and application prospects for the detection of metal mining collapse areas and therefore could provide a geophysical basis for the subsequent comprehensive management of the area.

关 键 词：金属矿采空塌陷 微动探测 频散曲线 三维横波速度结构 霍邱县某铁矿 

分 类 号：P631[天文地球—地质矿产勘探]