基于非对称设计的高密度电法观测装置研究

An observation device based on asymmetric design for high-density resistivity imaging

高密度电阻率法需要较好的接地条件来保证地电场的建立和测量,当遇到刚性路面等不良接地条件时,部分电极无法插入地下,将导致标准观测装置的数据缺失,影响成像质量。为此,本文提出了一种快速的观测装置设计方法,依靠缺失数据记录点的空间位置,使用非对称四极电极排列进行补充。数值模拟表明,该方法对温纳、斯伦贝谢和偶极—偶极装置的成像效果均有明显提升,且设计时间仅为秒级。该方法被成功应用到宁波堤防工程现场探测中,降低了机动车道对数据质量的影响,准确定位了堤防位置。

For the high-density resistivity method,favorable grounding conditions are required to ensure the establishment and measurement of the geoelectric field.Otherwise,unfavorable grounding conditions,like rigid pavement,will prevent some electrodes from being inserted into the ground,leading to the loss of valid data from standard observation devices and reducing the imaging quality.Therefore,this study proposed a method for the fast observation device design.This method supplemented data using an asymmetric quadrupole electrode array according to the spatial positions of missing data′s recording points.Numerical simulations show that the method proposed in this study significantly improved the imaging effects of Wenner,Schlumberger,and dipole-dipole arrays,with a second-scale design time.In this study,an observation device based on asymmetric design for high-density resistivity imaging was successfully applied to the embankment detection in Ningbo,reducing the influence of motor lanes on data quality and accurately locating the embankment position.