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Outline
In order to evaluate the safety impact of shield tunneling under close range on existing bridge pile foundations, this article focuses on a practical project and studies the influence of shield tunneling on the deformation of the lower structure of the bridge, the disturbance degree of a single pile, and the bearing capacity of the pile foundation in the vicinity of the bridge pile foundation area, especially when operating within a range of 3.0 meters from the pile foundation and crossing directly below it. The study adopts a combination of on-site monitoring and numerical simulation to systematically analyze the response characteristics of pile foundations during shield tunneling construction, and evaluates their impact in different zones based on the degree of disturbance. The results show that: ① When the shield tunneling machine excavates in the moderately weathered limestone layer with a horizontal clearance of 0 m, the induced single pile stress disturbance is significant, and the impact level is “strong impact”; ② When tunneling in strongly weathered limestone layers, due to insufficient residual bearing capacity of the pile foundation, the impact level within a horizontal distance of 3.0 m and a vertical range of 1.0~3.0 m is classified as “strong impact”; ③ When the rock embedding depth of the pile foundation is 1.0, 2.0, and 4.0 meters, significant single pile stress disturbances occur, and the impact level is also “strong influence”. The research conclusion can provide theoretical basis and engineering reference for the safety assessment and construction risk control of the interaction between shield tunnels and bridge pile foundations in similar 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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