盾构下穿高速公路袋装沙井加固区施工技术

Application of Shield Tunneling Technology in Reinforcement Area of Bagged Sand Wells on Highways

随着我国经济的快速发展,城市交通压力的日益加大,出现了大量的地铁隧道下穿高速公路的现象。由于受地形地质条件的制约,隧道下穿既有高速公路成为近年来的一种常见形式,而隧道顶部覆盖层较薄,路基填筑材料稳定性差,极易产生较大的变形,甚至失稳,将对隧道施工与高速公路运营造成安全影响。因此,需要采取有效的工程措施,以减小隧道施工对路基的扰动。本文以广州市轨道交通三号线东延段工程及同步实施工程金光大道站~海傍站区间为依托,通过分析国内外常规做法,研发出盾构下穿高速公路袋装沙井加固区施工技术,使得盾构穿越高速公路路基段在面对底下存在柔性加固物时,能够确保施工过程高效、快捷且安全,保证高速公路在不停运情况下施工及运营安全,并使沉降控制在允许范围内。实践结果表明,采用本技术进行施工,能有效地控制成本,并且为其他类似工程项目提供参考。

With the rapid development of our country's economy and the increasing pressure of urban traffic,a large number of subway tunnels have been constructed crossing highways.Due to the constraints of terrain and geological conditions,tunneling beneath existing highways has become a common practice.However,the thin cover layer above the tunnel and the poor stability of the roadbed fill materials can easily lead to significant deformation and even instability,affecting the safety of tunnel construction and highway operation.Therefore,effective engineering measures must be implemented to minimize the impact of tunnel construction on the roadbed.This article examines the Guangzhou Metro Line 3 East Extension Project,specifically the synchronous construction between Jinguang Avenue Station and Haibang Station.By analyzing common practices at home and abroad,a construction technology for shield tunneling through the baggage sand well reinforced area of highways has been established.This technology ensures efficient,rapid,and safe construction of shield tunneling within the highway roadbed,ensuring uninterrupted safe construction and operation of highways,and keeping settlement within acceptable limits.The practical results show that using this technology for construction can effectively control costs and provide reference for other similar engineering projects.