复杂环境城市隧道设计关键技术研究及应用

Research and Application of Key Technologies in Design of Urban Tunnel in Complex Environment

摘要:

以目前江苏省已建成通车的最长双向6车道城市土体隧道——南通市啬园路隧道为背景，结合其周边环境复杂、环保要求高、下穿被交路及河道和设置地下匝道的特点，分析复杂环境城市隧道设计关键技术。实际应用表明：城市隧道应重点考虑总体平纵横布置，做好防灾救援设计；隧道基坑呈现高低坑异形基坑特征，需根据内外坑距离B与内坑深度h的关系，考虑相互影响并进行一体化设计；主匝道分合流处主体结构跨度达23.3 m，采用折板拱结构型式；结合地面道路总体布置，提出采用竖井分散型通风方案。所得结论对于复杂环境城市隧道的建设具有参考作用。

Abstract:

Taking the Nantong Seyuan Road Tunnel, the longest two-way six-lane urban soil tunnel completed and opened to traffic in Jiangsu Province as the background, combined with its complex surrounding environment, high environmental requirements, and the characteristics of underpass intersected roads and rivers, and setting underground ramps, the key technologies for designing urban tunnels in the complex environment are analyzed. The practical application shows that the urban tunnels should focus on overall horizontal and vertical layout, and the good job in disaster prevention and rescue design. The tunnel foundation pit presents the characteristics of high and low pits with irregular shapes. The integrated design should be carried out by considering the mutual influence based on the relationship between the distance B between the inner and outer pits and the depth h of the inner pit. The main structural span at the junction of the main ramp reaches 23.3 m, and a folded slab arch structure type is used. Combined with the overall layout of the ground road, a shaft decentralized ventilation scheme is proposed. The conclusions obtained have reference value for the construction of urban tunnels in complex environment.