摘要
以某填海工程施工便道下穿既有高速公路桥梁安全评估为背景,采用三维有限元方法分析便道施工和使用过程对桥梁桩基的影响,对比桥墩保护措施实施前后桥梁桩基的附加内力和变形,根据土体变形和支护结构内力对原保护方案进行优化设计,并提出相应的监测建议。分析结果表明,“钢板桩+钢管桩”保护方案能有效减小路基开挖和车辆荷载引起的土体和桩基变形,钢拉杆对控制软基侧移无明显作用。分析加深了对海相深厚软土地基中既有桥梁桩基变形规律的认识,为今后类似涉路工程桥墩桩基保护设计和安全监测提供参考。
Taking the safety assessment of access road crossing existing highway bridges in a reclamation work as the background,the three-dimensional finite element method is used to analyze the influence of the construction and operation of the access road on the bridge pile foundation. The additional internal forces and deformations of bridge pile before and after the implementation of the bridge protection are compared. The original protection design is optimized according to the soil deformation and the internal force of the supporting structure,and corresponding monitoring suggestions are put forward. The results show that the "steel sheet pile + steel pipe pile" protection design can effectively reduce the deformation of soil and pile caused by roadbed excavation and traffic loading,and the steel tie rod has no obvious effect on controlling the lateral displacement of soft clay. This paper will deepen the understanding of the deformation law of existing bridge pile foundations in deep soft clay,and provide references for future protection design and safety monitoring of existing bridge foundations.
作者
曹淑学
CAO Shuxue(Bureau of Public Works of Guangming Municipality,Shenzhen,Guangdong 518106,China)
出处
《公路工程》
北大核心
2019年第5期142-150,共9页
Highway Engineering
基金
广东省科技计划项目(2015A010105029)
关键词
桥梁
桩基保护
软土地基
有限元分析
bridge
pile protection
soft clay
finite element analysis
