城市明挖隧道与地面夹空层空间合理化利用研究

Study on Rational Utilization of Urban Open-cut Tunnel and Ground Empty Layer

现代城市规模的迅速扩大导致空间需求急剧增长,地下空间的高效利用是缓解这一问题的主要措施之一。依托南京市横江大道快速化改造工程,研究不同工况下城市明挖隧道与地面夹空层空间的高效利用措施,同时结合数值模拟分析设计的合理性。结果表明:对于埋深较大的明挖隧道,建设地下停车场、平行于隧道的辅助道路或地下空间出入口,能够在设计合理的条件下最大限度利用夹空层空间;而对于埋深较浅的隧道结构,可在最大程度避免动荷载影响后,建设城市管廊或小型附属设施,且刚度大的设施结构能够有效扩散上部荷载应力传递,减小路面沉降及缓解道路横向沉降的不均匀性。研究可对城市明挖隧道建设空间利用提供设计思路。

The rapid expansion of modern cities has led to a rapid increase in space demand,and the efficient use of underground space is one of the main measures to alleviate this problem.Based on the rapid reconstruction project of Hengjiang Avenue in Nanjing,this paper studies the efficient utilization measures of open excavation tunnel and ground space under different working conditions,and analyzes the rationality of design in combination with numerical simulation.The results show that the underground parking lot,the auxiliary road parallel to the tunnel or the entrance and exit of the underground space can make the best use of the hollow space under reasonable design conditions.The moving load can be avoided to the maximum extent for the shallow tunnel structure,after the impact of the load,the construction of urban pipe gallery or small ancillary facilities,and the large stiffness of the facility structure can effectively diffuse the upper load stress transmission,reduce road surface settlement and alleviate the unevenness of road lateral settlement.The research can provide the design idea for the urban open excavation tunnel construction space utilization.