建筑物下大断面隧道施工方案及开挖模拟分析

Construction Scheme of Large Span Tunnels under Building and the Calculation Analysis

针对南京地铁鼓楼站———玄武门站停车线段双洞隧道地表有建筑物、两洞小间距且其中一个为大断面隧道的特点 ,提出了相应的施工工法 ,并采用二维有限元理论分析 ,论证了工法的合理性。分析表明 ,大断面隧道双侧导坑的上台阶、核心土的上台阶及小断面隧道的上台阶等开挖引起的地面沉降量较大。

This paper is an analysis based on the construction of the double-hole tunnels in Nanjing Metro,a section between the Drum-tower and Xuanwu Gate.The tunnels are dug under buildings on the ground,which made the space between two holes very narrow and one tunnel with a large span.The author discusses the construction method of the tunnels against difficult situation,and proves this method to be rational through 2D FEM analysis.This analysis,as the author argues,will guide the design and construction of tunnels with same background.