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To ensure the structural safety of existing shield tunnels during nearzero distance deep excavation and address the challenges of retaining structure construction and ground reinforcement under low clearance conditions, this paper presents a case study of a pump station excavation project in the Yangtze River floodplain area. The protection measures include Metro Jet System (MJS) piles with Hsteel insertion using highfrequency hydraulic resonancefree hammer, and synchronous prereinforcement inside the shield tunnel using longitudinal braces and filament wound profiles. Through comparative analysis of threedimensional numerical simulation and field monitoring data before and after deep excavation, the soil squeezing effect and timespace effect on the tunnel structure were effectively controlled. These findings can provide valuable reference for the design and construction of similar excavation projects.
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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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