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To address issues related to the size effect of deep circular shaft excavation for rail transit, this study analyzes the stress and deformation characteristics of a circular excavation enclosure structure using the foundation pit project of the ShenzhenDaya Bay Intercity circular working shaft as a case study. The loadstructure method is employed to systematically examine these characteristics under various diameter conditions. The study compares the calculation results from both a 3D spatial structure model and a 2D elastic foundation beam model, discussing the impact of excavation size on the performance of the circular enclosure structure. The findings reveal that the circular diaphragm wall behaves as a quasicircular structure, generating a vertical bending moment due to soil and water pressure, which indicates a multidirectional stress state. It is feasible to utilize a simplified 2D equivalent model for designing a circularfoundation pitretaining structure, as its calculation results are more conservative than those of the 3D model. Furthermore, the spatial dimension significantly influences the performance of the circular enclosure structure, with noticeable circumferential effects observed when the diameter of the deep circular working shaft is less than 30 m.
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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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