为研究城市地铁隧道施工侧穿邻近桩基时的变形控制问题，以保证桩基及上部结构的安全性和稳定性，结合某双线隧道穿越邻近立交桥实际工程条件，提出分段式深孔注浆加固方案，建立数值分析模型，通过不同注浆工况对桩基变形进行模拟与对比分析。结果表明：加固后匝道桥、环岛桥和跨线桥桩基较未加固模型的竖向位移分别减小了33.50%、40.71%和73.51%，水平方向位移分别减小了54.03%、56.31%和60.82%；隧道与桩基的水平净距较大时，拱顶注浆在控制土层扰动变形中效果显著；水平净距较小时，桩周注浆在控制桩基竖向变形中占主导地位。分段式深孔注浆加固方案能有效地减小桩基的竖向和水平变形，拱顶+桩周注浆加固方案可有效控制隧道近距离穿越施工过程中桩基的变形。

In order to study the deformation control issues when urban metro tunnel construction crosses adjacent pile foundations, ensuring the safety and stability of the pile foundation and its superstructure, a segmented deep-hole grouting reinforcement scheme was used to investigate the actual engineering conditions of a double-line tunnel crossing a nearby overpass. The results show that the vertical maximum grouting reinforcement rates of the ramp bridge, roundabout bridge, and overpass bridge pile foundations are 33.50%, 40.71%, and 73.51%, respectively, while the horizontal maximum grouting reinforcement rates are 54.03%, 56.31%, and 60.82%, respectively. It is concluded that the segmented deep-hole grouting reinforcement scheme effectively reduces both vertical and horizontal deformation of pile foundations, and the crown + pile perimeter grouting reinforcement scheme can effectively control pile foundation deformation during close-proximity tunnel construction.