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Outline
The key to prevent water outburst/gusher in coal mine is to clarify the hydraulic relationship between coal measure strata and aquifer, accurately detect the occurrence of abnormal areas, and take preventive measures in time. Based on the geological characteristics of the mining area and the evaluation of water inrush, the experimental system of coal-rock-water coupling occurrence was established to investigate the electric excitation response characteristics and signal attenuation characteristics of the medium under the magnetic field outside the borehole radar. The results show that the height of the water flowing fracture zone of the working face is 56.64 m, which exceeds the height of the water barrier. The working face is threatened by the water of the Changxing Formation aquifer and the goaf, and the risk of water inrush is high. In LCR digital bridge experiment, the dielectric constant of the medium decreases with the increase of frequency. At 100 MHz, the dielectric characteristics of the medium and the peak value of capacitance-dielectric loss(Cp−D)feature have obvious differences, and the signal transmission is stable. The resolution of borehole radar detection profile is increased at 100 MHz, and the imaging is stable. The low-resistivity anomaly area is mainly the boundary of rock strata and the water-bearing anomaly area of the Changxing Formation limestone, and some fracture zones have been found to contain water. The research results are brought into the pre-engineering consideration, and the results of geophysical exploration are further analyzed from the quantitative point of view, which provides some practical reference for similar geological water exploration work.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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