| 许颢砾.地面-井下双源瞬变电磁立体探测模拟研究[J].地质与勘探,2018,54(3):603-613 |
| 地面-井下双源瞬变电磁立体探测模拟研究 |
| Numerical and physical simulation of surface-underground stereo probing by the transient electromagnetic method |
| 投稿时间：2017-05-06 修订日期：2017-11-25 |
| DOI：10.12134/j.dzykt.2018.03.016 |
| 中文关键词: 瞬变电磁 COMSOL数值模拟 物理模拟 地面-井下立体探测 |
| 英文关键词: TEM, COMSOL numerical simulation, physical simulation, surface-underground 3D probing |
| 基金项目:国家重点研发计划南海典型岛屿主要废弃物资源化利用技术项目（编号：2017YFC0506304）资助 |
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| 中文摘要: |
| 在探测地下，井下或巷道下方的局部异常体时，地面瞬变电磁信噪较低而井下瞬变电磁发射磁距受限，因此探测深度较小。为解决这个问题，提出了一种地面大回线仅发射+井下重叠回线发射接收的地面-井下双源瞬变电磁立体探测方法。通过COMSOL软件数值模拟与室内水槽试验，模拟了四种不同的瞬变电磁装置（井下重叠回线，井上大回线发射+井下小回线接收，地面中心回线，地面-井下立体探测）探测。数值模拟结果发现地面-井下双源装置的感应电位曲线幅值最大且灵敏度最高；室内模型试验结果绘制成感应电动势多测道剖面图，分析比较其曲线特征，表明地面-井下瞬变电磁立体探测明显优于其他三种瞬变电磁装置，其效果非常明显、稳定且磁感应强度更高，与数值模拟结果一致。因此，地面-井下双源瞬变电磁立体探测方法可行且值得推广。 |
| 英文摘要: |
| The transient electromagnetic (TEM) method can be used to detect local anomaly bodies in the subsurface, mines or tunnels. Because the ground-based TEM method has low signal to noise ratio and the underground transient EM emission magnetic moment is limited, their probing depth is relatively small. To solve this problem, this work proposes a stereo probing approach using double magnetic sources on the surface and in the subsurface (central loop unit on the ground only transmit and coincide loop unit in the well). Its performance is tested by numerical and physical simulations. With COMSOL software and flume experiments indoors, 4 TEM devices (underground superposed loop, surface big loop transmit + underground small loop receiving, surface central loop, and surface-underground stereo probing) are simulated, respectively. The results of numerical simulation show that central loop unit on the ground and coincide loop unit in the well has the maximum amplitude in inductive potential curves and the highest sensitivity. Analysis of multi-measuring-channel V(t) sections from physical modelling indicates that the surface-underground stereo probing is better than other three devices, which is stable, having higher magnetic induction intensity, consistent with the numerical simulation. So, this detection method with double magnetic sources on the surface and underground is feasible and can be applied to a larger extent. |
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