高密度电阻率法在勘察黄土洞穴及岩溶中的装置适用性研究

High density resistivity method applied to the investigation of the loess cave and karst area

为了探究高密度电阻率法各种装置的适用性,基于有限差分法进行高密度电阻率法二级排列、三级排列、温纳装置、偶极装置、微分装置、偶极—偶极装置、斯伦贝谢装置等7种装置高、低阻异常体正演模拟。通过模拟结果可以看出,偶极装置对于低阻异常体和高阻异常体的探测效果均比较好,温纳装置仅适用于高阻异常体的探测以及高低阻异常体分界面的划分,其他装置模拟得到的高、低阻异常体的形态或位置与实际情况有一定偏差。将模拟结果运用于黄土洞穴、岩溶勘察中,取得了较好的探测效果,可供类似工区参考使用。

For the purpose of exploring the applicability of various devices of high density resistivity method and according to the finite difference method, the authors conducted forward modeling of high and low resistance abnormal body, which included 7 kinds of de-vices, i.e., secondary arrangement, tertiary arrangement, Wenner device, dipole device, differential device, dipole-dipole device, and schlumberger device. The simulation results show that the effect of the dipole device for detection of low resistivity anomalous body and high resistivity anomalous body is better, the Wenner device is applicable only to the detection of high resistivity of abnormal body and the boundary between high and low abnormal bodies, and the shapes or positions of the high and low abnormal bodies detected by other devices show certain deviations from the actual situation. The simulations were applied to loess cave and karst investigation, and achieved good detection results. The results obtained by the author provide a reference for the investigation in similar work areas.