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| Application of amplitude frequency electricity perspective in detecting coal seam floor water and grouting test |
| Cui Huanyu |
| Hebei mine geophysical detection engineering center, Hebei Coal Scientific Research Institute Corporation Ltd.， Xingtai 054000， China |
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Abstract A working face of Rongkang Coal Industry Co., Ltd. was seriously threatened by sudden water from Ordovician limestone karst fracture confined aquifer. It was necessary to clearly detect and correctly settle the limestone water-bearing anomaly body under the coal seam before working face mining. Based on the underground amplitude frequency electricity perspective detection technology and the fixed-point three pole electricity perspective construction layout method, the position of water-bearing anomaly body in the working face floor was detected, the watery zone was verified by drilling, grouting reinforcement was carried out, and then the secondary amplitude frequency electricity perspective detection was carried out. The results showed that the amplitude frequency electricity perspective technology was sensitive to the floor lithology change, and it had a good application prospect in the grouting effect evaluation of coal seam floor.
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