Abstract

With the constantly changing engineering construction sector, the detection accuracy of conventional electrical resistivity tomography (ERT) is no longer sufficient. A multichannel electrode design (MERT)-based ERT is introduced in this paper to address the growing need for resolution. The imaging accuracy of the ERT method is improved through the collection of apparent resistivity data in various directions by measuring the potential difference between different channels. Numerical simulation results of the inclined high-resistivity anomaly model reveal that MERT is a precise representation of the shape, inclined direction, and buried depth of the anomaly, with thoroughfare M₂N₂ producing the most precise forward and inverse results. Based on the analysis results of the model resolution matrix, when the buried depth of power supply points and the gap between potential acquisition points are 30%–90% and 30%–60% of the electrode distance, respectively, the MERT approach yields superior detection outcomes. The detection effect of the MERT method on anomalous bodies with different burial depths under the optimal parameters also indicates that the MERT method can obtain richer potential change information with higher resolution in deep areas compared to the ERT method. With the implementation of the MERT approach, the scope of applications for ERT is expanded, the accuracy of ERT detection is increased, and the progress of near-surface fine detection is positively influenced.

中文翻译：

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基于多通道电极的电阻率层析成像

摘要

随着工程建设领域的不断变化，传统电阻率层析成像（ERT）的检测精度已不再足够。本文介绍了基于多通道电极设计 (MERT) 的 ERT，以满足日益增长的分辨率需求。ERT方法通过测量不同通道之间的电位差来采集各个方向的视电阻率数据，提高了成像精度。倾斜高阻异常模型的数值模拟结果表明，MERT能够精确表征异常的形状、倾斜方向和埋深，其中通道M ₂ N ₂能产生最精确的正反结果。根据模型分辨率矩阵的分析结果，当电源点的埋深和电位采集点之间的间隙分别为电极距离的30%~90%和30%~60%时，MERT方法产生了优越的效果。检测结果。MERT方法在最优参数下对不同埋深异常体的探测效果也表明，与ERT方法相比，MERT方法能够在深部区域获得更丰富、分辨率更高的潜在变化信息。随着MERT方法的实施，扩大了ERT的应用范围，提高了ERT探测的精度，对近地表精细探测的进展产生积极影响。