微动法在马坑铁矿采空区的应用分析  

Analysis on the Application of Microtremor Method in Goaf of Makeng Iron Mine

作　　者：孔令添 王超凡 林烨 李文杰 KONG Lingtian;WANG Chaofan;LIN Ye;LI Wenjie(Fujian MaKeng Mining Co.,Ltd.;Zhongdi North China(Beijing)Engineering Technology Research Institute Co.,Ltd.)

机构地区：[1]福建马坑矿业股份有限公司,福建省龙岩市364000 [2]中地华北(北京)工程技术研究院有限公司

出　　处：《现代矿业》2023年第1期61-65,共5页Modern Mining

摘　　要：马坑铁矿受早期石灰石采矿影响,在83~87线地表发生过局部塌陷,为保证矿山井下开采的安全,通过采用微动法探测地表塌陷区及其外围50 m附近区域岩石的破碎程度。平行已有地质勘探线开展微动测量,圈定采空区顶板、底板和边界范围,大致查明塌陷所在区域内采空区平面分布范围及空间展布特征。探测结果显示:推测灰岩层横波波速值为350~750 m/s,与常规值相较严重偏低,说明该区域内灰岩整体岩体较破碎,下一步勘探工作前应加强安全管理,同时,勘探区域碎石土较多,测试接地条件较差,数据质量较差,局部区域可信度低。微动法能快速反映采空区形态、大小、埋深等空间分布特征,为采空区边界的划定提供依据,可在区域内对采空区做一个简单的评价。Due to the influence of early limestone mining,the surface of MaKeng Iron Mine partially collapsed between Line 83 and Line 87.In order to ensure the safety of underground mining,the microtremor method was used to detect the degree of rock fragmentation in the surface subsiding area and the surrounding area of 50 m.Carry out microtremor survey parallel to the existing geological exploration line,and delineate the roof,floor and boundary range of the goaf.Roughly identify the plane distribution range and spatial distribution characteristics of the goaf in the area where the collapse is located.The detection results show that the estimated shear wave velocity of limestone strata is 350~750m/s,which is seriously lower than the conventional value,indicating that the whole limestone rock mass in this area is broken,so safety management should be strengthened before the next exploration work.At the same time,there are many gravel soils in the exploration area,poor grounding conditions for testing,poor data quality and low credibility of local areas.Microtremor method can quickly reflect the spatial distribution characteristics of goaf,such as shape,size,buried depth,etc.,and provide a basis for defining the boundary of goaf.It can make a simple evaluation of goaf in the region.

关 键 词：塌陷区 采空区 微动法 

分 类 号：TD325.3[矿业工程—矿井建设]