Application of Transient Electromagnetic Method in Detecting the Effec-tiveness of Horizontal Directional Well Grouting Technology in Mines
[Purposes]This paper aims to find out whether there is a karst development area in the floor of 1340 working face in Zhaozhuang Mine,and to study the application effect of mine transient electromag-netic method in the effect detection of grouting technology in horizontal directional wells.[Methods]The mine transient electromagnetic method was used to detect the floor of the working face,and two low resis-tivity anomaly areas of apparent resistivity were found.According to the water-bearing characteristics of floor limestone,two main holes are designed in the low-resistance abnormal area,and the horizontal di-rectional well grouting technology is used for grouting reinforcement.When the main hole reaches the predetermined position,the directional hole is arranged for grouting.In order to detect the grouting effect after grouting,the mine transient electromagnetic method was used to carry out secondary observation in the low resistance development area.[Findings]By analyzing the data results after grouting and compar-ing with those before grouting,the apparent resistivity in the low-resistance development area increased,and the grouting effect was obvious.[Conclusions]The research results show that the mine transient elec-tromagnetic method can find the low resistivity anomaly area of apparent resistivity,and can effectively detect the effect of horizontal directional well grouting technology.
mine transient electromagnetichorizontal directional well groutinglow resistance abnormal areakarst water accumulationsecondary observation
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