中文摘要：

为了系统研究隧道开挖对邻近既受水平桩基的位移和内力的影响规律,本文采用三维数值分析方法,通过改变桩顶水平受力的方向和大小而获得隧道开挖对桩基附加内力和附加位移的影响规律.结果表明：隧道开挖对邻近既受荷载桩基的影响具有方向性,隧道开挖时尽量避免桩基不利方向的受力情况;隧道开挖前桩基承受的荷载越大,隧道开挖后对桩基的位移影响越大.因此,隧道开挖时需对不同受力情况的桩基加以区别保护,研究成果可为隧道施工和设计提供参考.

英文摘要：

In order to study the influence of tunneling on adjacent pile with different horizontal loadings, three- dimensional numerical analysis method is adopted. The laws of pile＇s addition inner force and displacement are obtained by changing the direction and size of horizontal loadings during tunneling. Many useful conclusions can be drawn. The adjacent pile is affected directionally by tunneling. Meanwhile, the adverse direction of loading on pile should be avoided as far as possible during tunneling. The results also reveal that the influence of pile＇s displacement increases with pile＇s horizontal loading during tunneling. Therefore, different protection measures must be adopted for pile with different loadings during tunneling. The conclusions will be useful for construction and design of tunnel_