隧道施工对临近桩基力学特性影响分析
郭小川

重庆交通大学土木工程学院，重庆，400041；

摘要：针对山城地铁隧道双侧壁导坑法开挖引起的桩-隧相互影响问题，应用理论分析和数值计算模型，设计了隧道与桩相隔不同距离的7组模拟实验工况，研究了关于隧道侧穿既有轨道桥桩的力学机理和隧道开挖对桩基的影响。研究结果表明：随着桩-隧间距的增大，距离越远的桩沉降变形越小，且两者间存在非线性关系；桩基的沉降随着隧道开挖逼近逐渐变大，但变化率逐渐趋于平稳；当使用双侧壁导坑法开挖时桩隧距离越小的桩，桩侧摩阻力变化率越大，桩隧距离超过70m时，开挖对桩基侧摩阻力的影响很小，可以忽略不计。研究成果可为山城地下交通建设提供重要参考。

关键词：地铁隧道；临近桩基；侧摩阻力；有限元

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