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Outline
To address the issues of low efficiency, significant environmental disturbance, and difficulties in attitude control in shaft construction in urban areas with dense buildings and limited space, this study proposes an innovative vertical mechanized construction technology centered on a cutting-type shaft boring machine, prefabricated segment structures, and a sinking construction method for isolated-boulder-bearing strata and high-strength rock strata. The effectiveness of this technology has been verified through its practical application in the No. 2 shaft project on the Jingxi Road-Baiyun Dongping section of the Guangzhou-Huadu intercity railway. The engineering practice results indicate that the adoption of undrained excavation with cutting bits and prefabricated assembly technology inside the shaft has significantly reduced the construction difficulty of the retaining structure, minimized stratum disturbance, and improved construction efficiency. The advance shaft advance excavation mode can effectively reduce stratum settlement and shear stress. The alternate excavation mode is suitable for strata with good mechanical properties, while the synchronous excavation mode is applicable to general strata (including those containing boulders), which can effectively control stratum settlement and deformation. Through the optimized design of drum picks, the drum grille and the slurry circulation system, the modified shaft equipment demonstrates stronger adaptability under complex geological conditions such as boulder-bearing strata and high-strength rock formations. The research results can provide a reference for the optimization of shaft equipment and construction technology in similar soft-hard alternating granite composite strata.
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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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