矿井瞬变电磁方法在铜川矿区东坡矿采区水文勘探中的应用

摘要

The structure of Dongpo minefield,Dongpo coalmine is an undulating monocline. During the winning of coal seam No.s4,9 and 11 will be threatened by water from Permo-Carboneferous fissue aquifers,Ordovician karst aquifers and gob water. In Order to pre-vent water bursting in winning faces,using mine transient electromagnetic method coaxial dipole installation carried out prospecting along three directions of 0° ,45° and 135° . Based on acquired apparent resistivity isogram carried out comprehensive evaluation for coal roof,floor rock strata water-hosting condition in No.401 face. The result has shown:in strata 50m above coal roof and below floor have relatively weak water yield property,but locally sandstone fissure water existed. In return way coal roof and floor apart from open-off cut 150~250m,have existed relatively low resistivity anomalous area,presumed as water rich zone;part of low resistivity anoma-lous phenomena in other areas may relate to faulted structures.%东坡煤矿东坡井田为一波状单斜构造，其在开采4、9、11号煤层时受以下三类水害威胁：石炭二叠系碎屑岩裂隙水、奥灰岩溶裂隙水、老空水。为了防止在采掘工作面发生突水事故，采用矿井瞬变电磁法同轴偶极装置沿0°、45°、135°等3个方向进行探测，根据获得的视电阻率等值线图对东坡煤矿401工作面顶、底板岩层赋水条件进行综合评价。结果表明：401工作面顶、底板上下各50m内岩层富水性相对较弱，但局部存在砂岩裂隙水；回风巷距切眼150～250m处的顶、底板中存在相对低阻异常区，推测为富水区；其他区域存在的部分低阻异常现象，可能与断层构造影响有关。