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Outline
In order to study the subsidence law of surface road engineering under the overlapping occurrence conditions of quicksand layer and goaf, taking the reconstruction and expansion project of S342 provincial road above the goaf of Dangyang gypsum mine, FLAC3D was used to study the distribution law of surface displacement under the conditions of quicksand layer, goaf and their overlapping occurrence. The influences of quicksand layer migration and goaf on the stability of surface road sections were evaluated, and a goaf treatment plan was proposed. The research results indicate that under the action of quicksand layer migration and goaf, the surface subsidence gradually decreases from the center of the goaf to the surrounding areas, and the peak subsidence is concentrated in the range of K5+617 to K5+717. The displacement and settlement in the central area of the road centerline are relatively large, showing a pattern of first increasing and then decreasing from west to east. The settlement on the north and south sides is relatively small, with the maximum surface settlement of the north, middle, and south lines of the road being 69 mm, 167 mm, and 31 mm, respectively. As the distance from the surface increases, the displacement of the overlying rock above the quicksand layer shows a decreasing trend in the central area (within a range of 100 m from K5+630 to K5+730), while the displacement in other areas shows an increasing trend. Therefore, the range of surface rock movement under the action of the goaf at the quicksand layer is defined as 100 m. The research results can provide theoretical basis for road expansion projects under the conditions of quicksand layer occurrence.
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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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