Full
Outline
To solve the problems of difficult management of the mudstone composite roof and poor roadway support effect in a coal mine in Shanxi Province, taking a typical working face of the coal mine as the engineering background, an in-depth study was conducted on the support scheme and support effect of the mining roadway with mudstone composite roof by means of field investigation, laboratory test, theoretical analysis and numerical simulation. First, the mudstone composite roof was classified according to the engineering geological conditions. Then, through physical and mechanical tests, the physical and mechanical parameters of each rock layer of the roof were obtained, which provides a reduction basis for the rock mass parameters in the numerical simulation. The corresponding roadway support schemes were formulated, and the support effect was evaluated using numerical simulation technology. The results show that based on the occurrence characteristics of the mudstone layer, the mudstone composite roof can be divided into five types. The main components of mudstone are clay minerals and quartz, with an internal friction angle of 30.78° and a cohesion of 75.362 kPa. A differentiated support scheme is proposed, that is, bolt-mesh-cable support is adopted for type Ⅰ, Ⅲ and Ⅳ roof roadways, bolt-mesh support is adopted for type Ⅱ roof roadway, and I-beam shed support is adopted for type Ⅴ roof roadway. The numerical simulation and field measurement results show that the designed support scheme can effectively control the deformation of the surrounding rock of the roadway and ensure the stability of the roadway with mudstone composite roof. The research results can provide a reference for roadway support design under similar geological conditions.
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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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