浅埋暗挖隧道不对称双联拱梁柱结构施工方案优化设计

Optimization Design of Construction Plan for Asymmetric Double-arch Beamcolumn Structure of Shallow-buried Tunnel

本文针对浅埋暗挖城市地下人行通道设备机房段不对称双连拱结构,优化了不对称双连拱隧道梁柱结构施工顺序。先施工大洞远离小洞一侧的导洞,并可继续进行其他工法待施工部位施工,同时进行小洞施工,避免了先开挖小洞后开挖大洞对工期的影响,加快了施工进度,降低了施工成本。同时基于FLAC3D数值模拟,对优化后双连拱结构最不利工况进行分析,竖向沉降在允许范围内。为进一步保证本优化方案的安全性与结构稳定性,在受力最薄弱处设置了梁柱结构。

This article optimizes the construction sequence for the beam-column structure of the asymmetric double-arch tunnel in the equipment room section of a shallow-buried urban underground pedestrian passage.The proposed approach involves first construction the guide hole on the side of the large tunnel away from the small tunnel and the construction of other parts can continue.At the same time,the small tunnel is constructed,which avoids the impact of excavating the small tunnel before the large tunnel on the construction schedule,accelerates the construction progress,and reduces the overall construction cost.Additionally,a FLAC3D numerical simulation is performed to analyze the most unfavorable working conditions for the double-arch structure,ensuring that the vertical settlement is within allowable range.To enhance safety and structural stability,the beam-column structure is strategically placed at the weakest stress point.