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In order to study the seepage characteristics evolution of rock mass in the water level-fluctuating zone under condition of water-rock interaction, the dolomite in the reservoir area of Wudongde Hydropower Station was selected as the research object in this paper. The variation law of fracture seepage characteristics was obtained through the single fracture seepage test. With the help of SEM and 3D surface contour scanning technology, the variation law of fracture surface microstructure and surface morphological characteristics was studied, and the influence mechanism of fracture seepage characteristics evolution law was discussed. The results show that in the process of water-rock interaction, when the seepage pressure is constant, the seepage decreases exponentially with the increase of confining pressure; When the confining pressure is constant, the seepage increases linearly with the increase of seepage pressure; With the increase of water-rock interaction period, the seepage of fractures decreases rapidly at first and then slowly, and then increases slowly and tends to be stable. The water-rock interaction softens and dissolves the minerals at a certain depth of the fracture surface, and changes the micropore structure and surface morphological characteristics. Under action of confining pressure, the fracture surface is more closed. The further reduction of effective crack width is the main reason for the decrease of fracture seepage.
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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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