软弱地层环境下地铁盾构下穿铁路框架桥影响分析及应对措施  

Influence analysis and countermeasures of metro shield tunneling under railway frame bridges in soft strata environment

作　　者：郑浩龙 Zheng Haolong

机构地区：[1]浙江数智交院科技股份有限公司,浙江杭州310030

出　　处：《现代城市轨道交通》2022年第5期48-53,共6页Modern Urban Transit

摘　　要：文章以杭州地铁 9 号线一期工程下穿沪杭铁路框架桥为背景,建立盾构下穿施工三维数值模型,分析软弱地层环境下地铁盾构隧道下穿施工对铁路框架桥的影响,提出多种确保铁路安全运营应对措施。施工过程中通过现场监测得出的数值分析表明,盾构隧道下穿施工中铁路框架桥最大沉降量为 6.72 mm;进行洞内注浆加固后,最大沉降量降为 4.76 mm;这说明在软弱地层环境下及时进行洞内注浆对抑制铁路框架桥的沉降变形具有显著效果。监测结果还表明,盾构右线施工对框架桥沉降变形的影响大于左线,且铁路框架桥最大沉降达到 6.9 mm;采取应对措施及时进行洞内二次注浆,可有效控制框架桥的持续沉降变形,使铁路框架桥处于安全可控状态。Based on the project of Hangzhou metro line 9,a three-dimensional numerical model of shield underpass railway frame bridge construction was established.The impact of metro shield tunnel construction through railway frame bridge in soft strata was analyzed,Multiple countermeasures are proposed to ensure the safe operation of railway,and field monitoring is carried out during construction.The research shows that the maximum settlement of the railway frame bridge is 6.72 mm.After the grouting reinforcement in the tunnel,the maximum settlement was reduced to 4.76 mm,indicating that the timely grouting in the tunnel in soft strata has a significant effect on restraining the settlement and deformation in the railway frame bridge construction.The monitoring result shows that the impact of right line construction on the settlement and deformation of the frame bridge is larger than that of the left line,and the maximum settlement of the railway frame bridge reached 6.9 mm.Taking countermeasures and timely carrying out secondary grouting in the tunnel can effectively control the continuous settlement,as well as deformation of the frame bridge,which is in a safe and controllable state.

关 键 词：地铁 盾构隧道 铁路框架桥 软弱地层 数值模拟 应对措施 

分 类 号：TU470[建筑科学—结构工程]