东南大学学报（自然科学版）2026，Vol.56Issue(4)：608-618,11.DOI:10.3969/j.issn.1001-0505.2026.04.014
岩土体介质四电极电阻率针入度评价模型研究
Evaluation modeling of four-electrode resistivity needle penetration in geotechnical media
摘要
Abstract
The widely used four-electrode method effectively avoids issues such as electrode polarization and contact resistance.However,electrode penetration can disturb soil structure and affect resistivity readings.Differences in penetration depth also cause current field attenuation discrepancies,potentially biasing results,and limiting applicability to hard soils or rocks.Therefore,improved evaluation methods are needed to accu-rately determine true resistivity in geotechnical media.This study analyzes the testing principles of the four-electrode method and conducts penetration-resistivity tests on sandy and clayey soils to explore resistivity variation with depth and to develop an attenuation model.Results show that resistivity increases approximately linearly with penetration depth,as deeper electrodes reduce current attenuation.Water content and dry density significantly influence this trend.After systematically examining the mechanisms by which factors such as wa-ter content,dry density,and soil type affect conductive penetration behavior,a multivariate nonlinear regres-sion attenuation model is established.Based on resistivity growth rate and its exponential relation to penetra-tion depth,along with threshold analysis,a surface-to-internal resistivity conversion model is proposed and validated.The findings broaden the applicability of the four-electrode method and achieves the goal of predict-ing internal true resistivity from basic soil state parameters.关键词
四相电极法/岩土体电阻率/最小阈值分析/针入度衰减模型/电阻率转换模型Key words
four-phase electrode method/resistivity of soil and rock media/minimum threshold analysis/penetration attenuation model/resistivity conversion model分类
建筑与水利引用本文复制引用
储亚,李志杰,蔡国军,闫超,刘松玉..岩土体介质四电极电阻率针入度评价模型研究[J].东南大学学报（自然科学版）,2026,56(4):608-618,11.基金项目
国家杰出青年科学基金资助项目(42225206) （42225206）
国家自然科学基金青年基金资助项目(42202303) （42202303）
江苏省自然科学基金青年基金资助项目(BK20220355) （BK20220355）
安徽省膨胀土力学与工程研究院开放课题资助项目(AHPZY2023KF02) （AHPZY2023KF02）
江苏省地质工程环境智能监控工程研究中心开放基金资助项目(2023-ZNJKJJ-07) （2023-ZNJKJJ-07）
江苏省"双创博士"计划资助项目(JSSCBS20210385) （JSSCBS20210385）
江苏省高等学校自然科学研究资助项目(21KJB170019). （21KJB170019）
