1. Introduction
According to the known data, in the present stage of Majiliang mine, the main coal seam of the carboniferous Taiyuan formation is c 3#, the mined-out areas of 14-2, 14-3 coal seams of the Jurassic Datong formation in Silaogou mine and the damaged areas of small kilns exist in the upper part of the designed and produced working faces of 8107, 8127 and 8208(c3# coal seam). The caving fracture formed during the production of C3# coal seam and the fault between the strata are likely to be connected with the upper goaf after being activated during the excavation, thus leading to the upper goaf water in the present working face. This caused a great safety hidden trouble to the safety extraction of the lower c 3 # coal seam. Because the data of abandoned coal mine is not known, and the distribution of goaf has no data to be verified, it is necessary to carry out transient electromagnetic survey in the area to be put into production, so as to explore the distribution of goaf water accumulation area. The transient electromagnetic exploration will provide the guidance data for the underground water exploration and drainage.
Satellite photo of survey area
2. Solution
Restricted by different topographic and geological conditions, water-conducting structures and discharge conditions, the distribution of water-rich strength is not uniform. Therefore, it is necessary to use transient electromagnetic methods (TEM) to explore the distribution of goafs and anomalous water containing/rich areas in the above mentioned areas.
TEM detection has the following advantages,
⑴ Because of high construction efficiency, pure secondary field observation and sensitivity to low-resistance bodies, it is the preferred method in the current hydrogeological exploration of coal fields.
(2) The transient electromagnetic method is the most sensitive method to find low-resistance geological bodies in high-resistance surrounding rocks, and has no topographic influence.
(3) Using the same point combined observation, it has the best coupling with the detection target, strong abnormal response, simple shape, and strong resolution.
⑷ Profile measurement and bathymetry are completed at the same time, providing more useful information.
3. Construction situation
The area of this exploration area is about 2.45km2. The entire detection project was officially launched in August 2020, and all work was completed in September and results were formed.
4. Achieved accomplishment
After statistical rating, the quality of the original data of this ground transient electromagnetic survey meets the requirements of the specification. The project has completed the predetermined geological tasks and explored 7 abnormal areas with water in the 8107, 8127 and 8208 areas respectively. The results can be used as a reference for water hazard prevention and control.
Plan of low-resistance anomaly area near 14-2 and 14-3 coal seams in 8107 survey area
Plan of low-resistance anomaly area near 14 coal seam in 8127 survey area
Plan of low-resistance anomaly area near 14-2 and 14-3 coal seams in 8208 survey area
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