研究目的:盾构隧道近距离穿越既有桥墩的理论研究在国内尚不成熟，可以类比的工程案例也不多且可 比性有限，对此课题进行研究，探讨此类工程的力学行为规律及行之有效的加固措施，是本文研究的目的，可 为类似工程提供参考或借鉴。
研究结论:盾构近距离穿越桥墩桩基时，若盾构与桥墩的间距小于隧道半径，双桩桥墩就会向反方向倾 斜，一定程度上加大了同步注浆量和二次注浆量。若同时对盾构和桩基间土体进行预加固，则是一种即安全 又经济的加固方案之一。
Research purposes : The theory of shield tunnel approaching pier nearby is not yet mature in China and there are a little construction practices to be followed, so it is necessary to do the research on this field for the purpose of seeking the mechanical behavior of shield tunnel approaching pile foundation of pier nearby and the effective reinforcing measures.
Research conclusions: When the shield tunnel approaches to pile foundation of piers nearby, two-pile piers will incline in reverse direction if the distance between the shield and piers is less than the radius of tunnel, which will result in increase of the volumes of the secondary and synchronous grouting to some extent. In this case, reinforcing the soil between the shield and outside piles in advance is a safe and economic way.
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