盾构下穿既有大桥墩台及桥台桩基的影响规律研究  

Study on Influence Law of Shield Tunneling Under Existing Bridge Pier and Abutment Pile Foundation

作　　者：李辉 LI Hui(Sichuan-Tibet Railway Co.,Ltd.,Linzhi 860025,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]川藏铁路有限公司,林芝860025 [2]西南交通大学土木工程学院,成都610031

出　　处：《交通科技》2024年第5期145-148,共4页Transportation Science & Technology

摘　　要：为探究盾构施工对既有大桥墩台及桥台桩基的影响规律,文中依托青岛某地铁项目进行数值模拟分析,研究盾构施工对既有临近高架桥的沉降、水平变形、铁路轨面变形,以及地表沉降的影响。结果表明,盾构下穿既有大桥结构,所产生的位移以沉降为主,产生的水平位移较小,且未对大桥结构造成明显安全影响。盾构下穿施工对地表纵、横向沉降均有影响,其中对地表横向沉降影响更大,但不会对地面沉降产生显著影响。相比于钢轨产生的水平不平顺,盾构下穿施工产生的高低不平顺影响更大,范围更远,但均在控制范围内,不会对列车运营安全造成威胁。In order to explore the influence law of shield construction on the pier and abutment pile foundation of the existing bridge,based on a subway project in Qingdao,numerical simulation analysis was carried out to study the influence of shield construction on the settlement and horizontal deformation of the existing adjacent viaduct,the deformation of railway track surface and the surface settlement.The numerical results show that the displacement caused by shield passing through the existing bridge structure is mainly settlement,and the horizontal displacement is small,which has no obvious safety impact on the bridge structure.Shield tunneling has an impact on both longitudinal and lateral surface subsidence,especially on lateral surface subsidence,but it will not have a significant impact on ground subsidence.Compared with the horizontal irregularity caused by rail,the height irregularity caused by shield tunneling has a greater impact and a farther range,but they are all within the control range and will not pose a threat to the safety of train operation.

关 键 词：盾构施工 数值模拟 影响探究 位移变形 

分 类 号：U455[建筑科学—桥梁与隧道工程]