地下通道与下穿轨道交通共建案例分析

摘要:

随着城市发展,城市地下通道与轨道交通发展迅速,两者相互影响在所难免。本文以南京南站北广场绕城公路地下通道与规划轨道交通三号线共建的实际案例,对主体结构和围护结构共建设计理念及方法、施工步序进行详细介绍。轨道交通斜穿地下通道的暗埋、敞开段,采用短而密的桩基控制差异沉降,减小桩基支承点处的应力集中。轨道交通深坑的围护桩锚入结构底板,依据底板的连接控制水平约束；反之,围护桩可发挥桩基锚固作用控制沉降。实践证明,本实际方案安全可靠、简单合理、便于施工,可作将来类似问题参考。

Abstract:

During the development of cities, underground tunnel and subway grow rapidly and have an important complex inter-action. In this paper, the writer gives an example, that is Ring Road tunnel and metro line 3, which were constructed considering the mutual contributions. In the present analysis, the design ideas and methods,as well as work steps are introduced in detail. Metro line 3 goes under Ring Road tunnel from buried rectangular part to open part with an angle. By using more but short piles, the concentricity response is going to be weaken. The retaining piles of under lying Metro line 3 were tight into the baseboard of upper tunnel, which can help to diminish the movement; on the other hand, retaining walls can control the vertical displacement. From the analysis and actual works, one can see that the method is safe, simple and easily construed, so it can be referred in future.