CAJ | 학술논문

为研究大地电磁倾子的异常响应特征，采用四边形剖分有限元实现了倾子正演计算。对异常体、倾斜断层、静态位移和地形等模型进行数值模拟，完善了视倾子资料的推导和计算，并对倾子和视倾子资料进行了对比分析。在新建铁路丽香线中义隧道音频大地电磁勘探中，利用TE模式的视电阻率和相位，计算得到了视倾子资料。研究结果表明：倾子对异常体横向边界和断层有明显反映；仅在中高频段（频率1 Hz以上）静态位移和地形对倾子有影响，倾子和视倾子资料有较好的对应性；视倾子较好地反映了隧道主要断层、破碎带的位置、规模和倾向等，同时可以反映更多细微的异常结构。
위연구대지전자경자적이상향응특정，채용사변형부분유한원실현료경자정연계산。대이상체、경사단층、정태위이화지형등모형진행수치모의，완선료시경자자료적추도화계산，병대경자화시경자자료진행료대비분석。재신건철로려향선중의수도음빈대지전자감탐중，이용TE모식적시전조솔화상위，계산득도료시경자자료。연구결과표명：경자대이상체횡향변계화단층유명현반영；부재중고빈단（빈솔1 Hz이상）정태위이화지형대경자유영향，경자화시경자자료유교호적대응성；시경자교호지반영료수도주요단층、파쇄대적위치、규모화경향등，동시가이반영경다세미적이상결구。
In order to analyze abnormal responses of 2D magnetotelluric tipper data,a tipper data forward calculation was developed using the finite element quadrilateral mesh,and a forward numerical simulation of the abnormal body,inclined faults,static effects,and terrains was made based on their theoretical models. The derivation and calculation of the apparent tipper data were improved,and the tipper and apparent tipper were compared. As an application example,the apparent tipper was calculated using the transversal electric (TE )-mode apparent resistivity and phase data during the audio-magnetotelluric (AMT )exploration of the Zhongyi tunnel on the newly built Lijiang-Shangrila railway. The results show that the tipper can reflect the abnormal lateral boundary and fault apparently,and is only affected by the static displacement and topography at mid-high frequency band above 1 Hz,where the tipper and apparent tipper data have a good correspondence. In addition,the apparent tipper data can not only locate the fracture zone of the tunnel and reflect the position,scale, and trend of main faults effectively,but also can reflect the more subtle abnormal structures.