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This study examines shield direct cutting techniques on largediameter piles within the construction project linking Guanzhou Station to University Town North Station on the Guangzhou Metro Line 12. Focusing on piles with diameters of 1,200 mm and reinforcing bars with diameters of 25 mm and 28 mm, the research evaluates the efficacy of critical measures and the resultant quality of pile cutting within shield construction. Findings indicate that a cutter head configuration, incorporating a hob and a tearing knife, successfully penetrates concrete pile foundations containing rebar of the specified diameters. However, a challenge arises when a toothed hob attempts to sever the reinforcing bar directly. It is observed that the tearing knife's secondary action exerts adequate shear force to dissect the reinforcement at the precut location by the hob. Furthermore, employing a boring strategy characterized by a low advancement rate, high rotation speed, and consistent torque has proven to enhance the cutting process for both the pile body and its embedded steel bars. Additionally, the use of split hydraulic rebar shears delivers an improved response to the complications presented by intertwined steel bars within the shield machine's path.
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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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