地铁车站和区间采用不同工法多次穿越同一座立交桥和挡墙，且结构、工法分界接口处于桥梁受力复杂连续梁段的工程较为罕见。为研究各工法和不同施工阶段对立交桥及挡墙的影响和敏感程度，以复杂环境下的北京地铁12号线人民大学站、苏州桥站—人民大学站区间为整体分析对象，采用经验公式及有限元计算分析等方法，研究各施工阶段和采取措施前后对桥梁、挡墙的影响，并将计算得到的理论值和现场施工的实际监测值进行对比分析。结果表明： 1）采取洞内措施+洞外措施+协调南北侧施工部署、加强监测及关键工序控制等综合处理措施效果明显，尤其是桩底注浆、桥梁主动顶升和承台横系梁等非常规措施的采用，证明了车站和区间结构的设计方案及施工方案合理可行； 2）车站主体结构采用PBA工法，开挖断面大、工序衔接复杂，车站主体施工阶段对沉降影响最大； 3）盾构区间采取隔离措施的1轴桥桩沉降与其他桥桩基本相当，类似工程采取隔离措施的必要性不大； 4）无论车站处还是区间处挡墙，沉降趋势及总沉降均与地面沉降及变形趋势基本一致。

 Metro stations and sections use different construction methods to cross the same overpass and retaining wall for many times, and it is rare that the boundary interface of structure and construction method is located in the continuous beam section with complex stress of the bridge. To study the impact and sensitivity of various construction methods and stages on overpasses and retaining walls, the author takes the Renmin University Station and the section of Renmin University Station and Suzhou Bridge Station of Beijing Metro Line 12 under complex environment as the overall analysis object, and adopts empirical formula and finite Meta computing analysis methods to study the impact of various construction stages and measures on bridges and retaining walls before and after implementation, and compares the calculated theoretical values with the actual monitoring values during onsite construction. The results show that: (1) Comprehensive treatment measures such as taking measures inside and outside the tunnel, coordinating the construction deployment on the north and south sides, strengthening monitoring, and controlling key processes are effective, 〖HJ2.3mm〗especially the use of unconventional measures such as pile bottom grouting, bridge active lifting, and bearing platform transverse beams; It is proved that the design and construction plans of the station and section structures are reasonable and feasible. (2) The main structure of the station adopts the PBA construction method, with a large excavation section and complex process connection. The construction stage of the station main body has the greatest impact on settlement. (3) The settlement of the 1st axis bridge piles with isolation measures in the shield tunnel section is basically equivalent to other bridge piles, and the necessity of adopting isolation measures in similar projects is not significant. (4) The settlement trend and total settlement of the retaining wall at both the station and section are basically consistent with the ground settlement.