桥梁桩基被盾构隧道近距离穿越的影响研究

以盾构隧道近距离穿越地下既有桥梁桩基为工程背景，采用MIDAS有限元数值模拟技术，对施工过程中隧道、桩基的内力变化与住移趋势进行了比较详细的计算分析，发现靠近桩基一侧隧道边墙内力增大，桩基将会出现偏向隧道方向的水平位移，错缝拼装将会导致隧道的安全性下降，而管片的拼装方式对桩基的影响不大，桩基附近的地基加固能有效抑制桩基的水平位移等规律，为后续类似工程的设计与施工积累经验。

Research on short-distance of shielding tunnel of bridge pile foundation

Taking the short-distance underground existing bridge pile foundation of shielding tunnels as the engineering background, the paper adopts MIDAS finite element value simulation technique, has the detailed calculation analysis of the internal changes in tunnels and the pile foundation and the displacement tendency in the construction process, and finds that the pile foundation will have the horizontal displacement from the tunnel direction when the internal force of the side tunnel close to the pile foundation increases, the staggered joint erection may lead to the lowered safety, while the joint methods of the pipe parts has little influence on the pile foundation, and the reinforcement of the foundation near the pile foundation can effectively restrain the horizontal displacement of the pile foundation, so as to accumulate the experience for the design and the construction of the similar construction.