郑恒良

• 1:中铁十二局集团第一工程有限公司

摘要(Abstract)：

曲线隧道需严格控制盾构施工轴线与设计曲线之间的偏移量。为此，推导了切线始发、割线始发以及内外侧预偏移始发时盾构机的轴线偏移量计算公式，提出了减少盾构始发偏移量的解决办法。在分析各种始发方式对直线段和姿态调整段的盾构轴线偏移的影响规律的基础上，探讨了盾体与连接桥之间转动受限时的解决办法。结果表明：小半径曲线段盾构施工宜采用割线始发或外侧预偏移始发，其中外侧预偏移始发的最大偏移量明显小于割线始发，且外侧预偏移始发比割线始发更易控制姿态调整段的偏移量；当线路转弯半径与盾构最小转弯半径相接近时，盾构始发后应提前调整盾构姿态，否则姿态调整段的最大偏移量很容易超过规范允许值；小半径曲线段盾构始发时，盾体与连接桥的转角容易超过盾构机的允许范围，应考虑将盾构设计轴线往曲线内侧适当平移。

关键词(KeyWords)： 曲线隧道;盾构始发;轴线偏移;小半径

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(59035679)

作者(Author): 郑恒良

DOI: 10.13928/j.cnki.wrahe.2022.09.012

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