摘要
为了更加准确地分析盾构施工下穿桥梁基础的影响情况,以半洋隧洞引水工程(枫江—半洋段)隧洞下穿甬莞高速桥的实例为依托,采用有限元分析软件数值模拟与现场监测相结合的研究方法,重点分析了盾构施工对地表及桥梁基础结构的沉降变形情况。结果表明:盾构施工会引起地层发生竖向位移,造成地面及桥梁发生沉降变形,桥梁基础越靠近盾构线路,所受到的影响就越大,相邻墩台不均匀沉降越严重,桥梁存在安全隐患。采取旋喷桩等隔离加固措施能有效减小桥梁结构的竖向变形,改善桥梁不均匀沉降等问题。通过建立模型能很好地模拟分析盾构下穿桥梁的施工情况,对比分析了无加固和隔离加固两种条件下桥梁的沉降变形情况,并通过后期施工监测数据加以验证,指导工程施工。
In order to more accurately analyze the influence of shield construction on under-crossing bridge foundation,taking the example of Banyang Tunnel Diversion Project(Fengjiang~Banyang section)tunnel underneath the Ningbo-Dongguan high-speed bridge,and using finite element analysis software for numerical analysis and on-site monitoring,this paper emphatically analyzed the settlement deformation of bridge foundation caused by shield construction.The results show that:①Shield construction causes vertical deformation of the ground and settlement and deformation of the ground and the bridge.The closer the bridge foundation is to the shield line,the greater the impact it receives.The adjacent piers have uneven settlement,and the bridge have potential safety hazards;②The use of jet grouting piles and other isolation and reinforcement measures can effectively reduce the vertical structure of the bridge.③Through the establishment of a model,it can simulate and analyze the construction of the shield under the bridge,and compare and analyze the settlement and deformation of the bridge under the two conditions of non-consolidation and isolation and reinforcement.The later construction monitoring data is verified to guide the construction of the project.
作者
乔晓锋
钟哲
QIAO Xiaofeng;ZHONG Zhe(Guangdong No.2 Hydropower Engineering Co.,Ltd., Guangzhou 511340,China;Water Conservancy and Hydropower Construction Engineering Technology Research Center of Guangdong Province,Guangzhou 51134,China)
出处
《广东水利水电》
2022年第3期7-14,共8页
Guangdong Water Resources and Hydropower
关键词
盾构施工
桥桩沉降变形
有限元分析
旋喷桩隔离加固
shield construction
bridge pile settlement deformation
finite element analysis
isolation and reinforcement of rotary jet piles
