超深盾构隧道长距离下穿机场设计与施工关键技术
杜峰1杨超2
Key Design and Construction Technologies for Ultra-deep Shield Tunnel Underpassing Airport over Long Distance
DU Feng1YANG Chao2
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作者信息:1.上海申铁投资有限公司， 200010， 上海
2.上海市政工程设计研究总院（集团）有限公司， 200092， 上海
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Affiliation:1.Shanghai Shen-Tie Investment Co.， Ltd.， 200010， Shanghai， China
2.Shanghai Municipal Engineering Design Institute （Group） Co.， Ltd.， 200092， Shanghai， China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20252057
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中图分类号/CLCN:U212
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栏目/Col:土建工程
摘要:
［目的］ 上海机场联络线在浦东机场范围下穿10条滑行道、卫星厅等众多机场设施，盾构管片外径为9 m，隧道拱顶最大埋深为52 m，隧道全断面位于⑦2粉砂层、长度约为1.9 km；其设计难度大、施工风险高、可参考工程案例及施工经验匮乏，需对超深埋、高水压、长距离砂性地层盾构管片的设计与施工关键技术进行深入研究。［方法］ 对管片接缝内不同形状的弹性密封垫进行耐水压试验，以确定合适的截面参数；针对超深埋、高水压、长距离砂性地层盾构施工风险，选用气垫式泥水平衡盾构，并加强主驱动、盾尾密封设计，以确保盾构主驱动承压能力大于1.0 MPa，盾尾密封承压能力大于0.8 MPa；在盾构推进中，通过控制同步注浆量、盾尾油脂压注量，来保证盾尾密封效果；根据盾构掘进地层差异，结合盾构推力、刀盘扭矩变化，利用盾构机径向压注触变泥浆，以改善掘进参数、缓解刀具磨损。［结果及结论］ 盾构施工过程中未发生盾尾及管片接缝渗漏，工程引起滑行道最大沉降值均小于7 mm，满足沉降控制要求，从而验证上述技术措施的有效性。
Abstracts:
［Objective］ Shanghai Suburban Railway Airport Link Line passes beneath 10 taxiways， the Airport Satellite Hall and other airport facilities within the Pudong International Airport area. The outer diameter of the shield tunnel segment is 9 m， with a maximum tunnel arch vault burial depth of 52 m， and a total tunnel sectional length of approximately 1.9 km entirely situated within the ⑦2 silty sand stratum. Due to the high design difficulties， high construction risks， and very limited reference projects or construction experiences， it is necessary to conduct an in-depth study on key design and construction technologies of shield segments in ultra-deep burial， high water-pressure， long-distance sandy strata. ［Method］ Water pressure resistance tests are conducted on elastic sealing gaskets of different shapes used in segment joints to determine appropriate cross-sectional parameters. In response to the construction risks posed by ultra-deep burial， high water-pressure， and long-distance sandy strata， the air-cushion slurry balance shield machines are adopted， with enhanced main drive and shield tail seal designs to ensure that the pressure-bearing capacity of main drive exceeds 1.0 MPa， and the segment tail seal pressure-bearing capacity exceeds 0.8 MPa. During shield advancement， the shield tail sealing performance is ensured by controlling the synchronous grouting amount and shield tail grease injection volume. According to the differences in shield tunneling strata， variations in shield thrust and cutterhead torque are analyzed， and the thixotropic slurry is injected radially utilizing shield machine to optimize excavation parameters and reduce cutter wear. ［Result Conclusion］ During shield tunneling， no leakage occurred at both shield tail and segment joints. The maximum settlement values of the taxiways caused by engineering are all less than 7 mm， meeting the settlement control requirements， thereby verifying the effectiveness of the above technical measures.
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