管廊基坑施工对相邻地铁高架影响分析

Influence of Utility Culvert Excavation Construction on the Adjacent Subway Viaduct

某管廊工程需在临近既有地铁高架侧进行基坑施工,为确保施工期间地铁高架线路运营安全,因基坑卸载引起的地铁高架变形值须控制在地铁安全允许范围内。根据常规经验,基坑施工对周边环境影响主要集中在开挖阶段,为此近地铁侧基坑设计采取排桩加内支撑的强支护形式,并采用三维有限元建模的方法,对开挖过程土体及地铁高架各向位移进行数值模拟。计算分析结果表明,基坑开挖引起的地铁高架变形符合一般规律,在采取针对性的变形控制措施后,管廊施工满足地铁保护要求,研究结果可为地铁影响范围内其他类似工程的实施提供参考。

A utility culvert need to be installed near a viaduct of the metro subway structure.The unloading deformation in the viaduct structure induced by the excavation of this utility culvert needs to meet the requirement of the safe operation of the subway.According to past experience,the impact of foundation excavation construction on the surrounding environment is mainly at the excavation stage.Therefore,the strong support form of soldier piles with internal support was adopted in the design of deep excavation near the subway.The three-dimensional finite element modeling method was used to simulate the displacement of the soil and subway viaduct in all directions during the excavation.The calculation and analysis results show that the deformation of the subway viaduct caused by the deep excavation conforms to the general trend.After taking the targeted measures for the deformation control,the utility culvert construction meets the requirements for the subway protection.The research results can provide a reference for the implementation of other similar projects within the influence range of subway.