物探与化探2024，Vol.48Issue(5)：1215-1222,8.DOI:10.11720/wtyht.2024.1277
孔—巷瞬变电磁隧道不良地质体超前预报方法研究
Seismic prediction of unfavorable geobodies in tunnels using the borehole-roadway transient electromagnetic method
摘要
Abstract
Tunnel detection in complex environments requires fine-scale detection of small unfavorable geobodies like karst caves and fissures.Hence,this study designed a tunnel construction model with a small karst cave in front of the tunnel face.A borehole was drilled at the center point of the tunnel face towards the construction direction,and then an electrical source was put into the borehole for excitation.Array data acquisition was conducted on the tunnel face.The 3D forward modeling based on transient electromagnetic data was performed using the time-domain finite element method.As indicated by the results,the electromagnetic sounding of the target was achieved through the movement of the electrical source,and the planar position of the unfavorable geobody was determined based on the distribution patterns of the electromagnetic field on the tunnel face.Therefore,electrical source excitation in a borehole can en-hance the detection ability of the transient electromagnetic method on small karst caves,serving as a feasible method for improving the accuracy of tunnel seismic prediction.关键词
瞬变电磁法/隧道超前预报/精细探测/含水溶洞/孔中电性源Key words
transient electromagnetic method/tunnel seismic prediction/water-bearing karst cave/electrical source in a borehole/vector finite element分类
天文与地球科学引用本文复制引用
李贺,李貅,戚志鹏,曹华科..孔—巷瞬变电磁隧道不良地质体超前预报方法研究[J].物探与化探,2024,48(5):1215-1222,8.基金项目
河北省引进留学人员资助项目(C20230368) （C20230368）
河北地质大学预研项目(KY2024QN28) （KY2024QN28）
