煤田地质与勘探2025，Vol.53Issue(11)：23-33,11.DOI:10.12363/issn.1001-1986.25.05.0366
不同角度双孔观测系统直流电法超前探模拟研究
A simulation study on a dual-borehole DC resistivity system for advance detection under varying angles
摘要
Abstract
[Significance]Mine direct current(DC)methods,an efficient geophysical exploration technique,can be used to identify and delineate underground electrical resistivity anomalies,serving as a critical means for the advance detec-tion of water-bearing or hydraulically conductive structures ahead of the mining face.[Methods]By combining the wa-ter exploration and discharge boreholes commonly used in coal mining and making reference to the observation system of the ground-based cross-borehole DC resistivity CT method,this study devised a dual-borehole DC resistivity observa-tion system for advance detection.Through numerical simulation using the COMSOL software,this study constructed a homogeneous full-space model,in which a low-resistivity ball was used to represent a water-rich zone.Three types of observation configurations were developed,namely single-borehole sounding,dual-borehole profiling,and cross-bore-hole observation,with the included angle between a borehole and the tunneling direction set at 22.5°,30°,and 45°.The full potential matrix was obtained through simulation,followed by apparent resistivity calculation and inversion imaging.Accordingly,the impacts of varying observation configurations and the included angles on the detection of the low-res-istivity ball were compared.[Results and Conclusions]In the case where the position of the anomaly was fixed,a lar-ger included angle between a borehole and the tunneling direction corresponded to gentler apparent resistivity curves with less distinct extrema,making it difficult to identify the influence range of the low-resistivity ball.Conversely,a smaller included angle was associated with more pronounced local maximum and minimum values,suggesting more sig-nificant anomaly responses.The inversion results of numerical simulation show that a smaller induced angle correspon-ded to better alignment between the location of the low-resistivity anomaly and the actual position of the ball.Besides,it was also associated with greater consistency between resistivity and its preset values.Among various configurations,the cross-borehole observation yielded the highest detection performance.The inversion results from the physical simula-tion conducted using a water tank confirm that,as the induced angle decreased,the detection results of the observation configurations became gradually better in the order of single-borehole sounding,dual-borehole profiling,and cross-bore-hole observation with an increase in the size of data acquired.These findings are consistent with the results from the nu-merical simulation,further verifying the reliability of the proposed observation system.The results of this study provide new technical guidance for advance detection in roadway tunneling.关键词
矿井直流电法/超前探测/数值模拟/双孔观测/视电阻率/水害防治Key words
mine direct current(DC)method/advance detection/numerical simulation/dual-borehole observation/ap-parent resistivity/prevention and control of water disasters分类
天文与地球科学引用本文复制引用
周官群,许少添,张维鑫,王亚飞,吴小平,胡雄武,陈兴海,曹煜..不同角度双孔观测系统直流电法超前探模拟研究[J].煤田地质与勘探,2025,53(11):23-33,11.基金项目
国家重点研发计划课题(2022YFF1303302) （2022YFF1303302）
国家自然科学联合基金重点项目(U2039206) （U2039206）
