新建回龙湾隧道穿越既有公路隧道稳定性影响研究

Study on Stability of Huilongwan Tunnel Undercrossing the Existing Highway Tunnel

随着交通网络的建设,公路隧道与铁路隧道甚至与轨道地下工程出现各种形式的交叉。地下隧道上跨或下穿建设相互影响是目前行业的研究难点之一。在新建铁路隧道时,经常会遇到下穿既有公路隧道的情况,新建隧道在建设中会对既有隧道的稳定性造成影响。依托新建重庆铁路枢纽东环线回龙湾隧道穿越既有龙洲湾隧道工程,利用三维数值模拟研究新建铁路隧道开挖过程对既有公路隧道产生的位移变化和结构变形规律,判断新建隧道开挖过程中对既有隧道结构稳定性的影响。

With the construction of the transportation network,highway tunnels and railway tunnels even intersect with underground rail projects in various forms.The mutual influence of underground tunnel crossing or undercrossing construction is one of the research difficulties in the current industry.When a new railway tunnel is built,it is often the case that the existing highway tunnel is underpassed.The stability of the existing tunnel will be affected by the construction of the new tunnel.Based on the Huilongwan Tunnel of the East Loop Line of the New Chongqing Railway Hub crossing the existing Longzhouwan Tunnel Project,the three⁃dimensional numerical simulation is used to study the displacement change and structural deformation law of the existing highway tunnel caused by the excavation process of the new railway tunnel and to evaluate the influence of the excavation process of the new tunnel on the stability of the existing tunnel structure.