CAJ | 학술논문

根据海拉尔露天矿区实际地质情况建立相应的地球物理模型，对理论地电模型和高阻采空区模型进行三维数值模拟，探讨高阻目标体的瞬变电磁响应特征和分布规律，并确定适合该地区的时深换算系数。结果表明：瞬变电磁法能够比较清晰地反映出地下浅埋高阻目标体，视电阻率等值线横向变化剧烈，受其影响，视电阻率等值线上拱或下凹，形成明显的高阻异常区，与物理模拟实验结论相似，时深换算系数取1.1~1.2时计算得到的视深度与实际地层厚度的误差较小。工程实践表明：对于埋深不大于100 m的小窑采空区而言，只要选择合理的参数，瞬变电磁法能够探测出直径大于5m的未塌陷小窑采空区，并可查明其空间分布范围和埋深。
근거해랍이로천광구실제지질정황건립상응적지구물리모형，대이론지전모형화고조채공구모형진행삼유수치모의，탐토고조목표체적순변전자향응특정화분포규률，병학정괄합해지구적시심환산계수。결과표명：순변전자법능구비교청석지반영출지하천매고조목표체，시전조솔등치선횡향변화극렬，수기영향，시전조솔등치선상공혹하요，형성명현적고조이상구，여물리모의실험결론상사，시심환산계수취1.1~1.2시계산득도적시심도여실제지층후도적오차교소。공정실천표명：대우매심불대우100 m적소요채공구이언，지요선택합리적삼수，순변전자법능구탐측출직경대우5m적미탑함소요채공구，병가사명기공간분포범위화매심。
Three-dimensional numerical simulation has been carried out to test the theoretical models and high-resistance gob area models in coal mine based on the geophysical model established according to the actual geological conditions of the opencast mine in Hailaer. The response characteristic and dis-tribution law of transient electromagnetic field have been discussed and the parameter of time-depth conversion has been determined. The numerical results show that Transient electromagnetic method can clearly reflect the shallowly-buried and extremely thick high-resistance objective underground. The lev-el curve of the apparent resistivity has a drastic lateral variation, with a camber and concave line, which indicates that it is the high resistivity anomaly area. And numerical method has similar conclusions with physical experiment for the geologic model. For a given geoelectric model when choosing time-depth conversion parameter γ=1.1 or 1.2, the error is small. The applied result shows that: for the inter-mining coal pit, with the buried depth less than 100 meters, as long as a reasonable parameter is chosen, TEM can find out the small mine gob area with over 5 meters in diameter and its distribution range and depth.