摘要
文章以深圳地铁2号线下穿沙湾河桥工程为实例,详细介绍了隧道内托换既有桩基的设计施工关键技术;并通过理论分析、数值计算及现场监测,验证了该工法的合理性。研究结果表明:通过隧道内托换既有桩基,可减少对桥梁的拆迁,减小对地面交通的影响。该工法的关键在于:制定托换原则,确定托换结构形式和布置方式,并采取合理的隧道开挖和桩基托换步骤,从而将既有建筑物的沉降和变形控制在允许范围内。
Using the Shenzhen Metro line 2 passing underneath the Shawan River Bridge as an example, the key tech- niques for the design and construction of the underpinning of the existing pile foundation in the tunnel are presented, and the rationality of this construction method is verified by theoretical analysis, numerical calculations, and site moni- toring. The study results show that the underpinning of an existing pile foundation in a tunnel could minimize the im- pacts of removing an existing bridge on ground traffic. The key points of this method include preparation of the under- pinning principle, determining the underpinning structure and layout, using reasonable procedures for tunnel excava- tion and pile foundation underpinning, and keeping the settlement and deformation of existing buildings within an al- lowable range.
出处
《现代隧道技术》
EI
北大核心
2013年第4期164-169,175,共7页
Modern Tunnelling Technology
关键词
地铁隧道
桩基托换
施工工艺
Metro tunnel
Pile foundation underpinning
Construction technology
