城市地下道路立交隧道合理间距及支护加强范围研究  

Study on the Reasonable Spacing and Enhanced Support Zone for the Interchange Tunnels of an Urban Underground Road

作　　者：李鹏飞[1,2] 王帆[1,2] 张成平[3] 秦世朋 聂雄[3] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京城市交通协同创新中心,北京100124 [3]北京交通大学城市地下工程教育部重点实验室,北京100044

出　　处：《现代隧道技术》2015年第6期111-117,共7页Modern Tunnelling Technology

基　　金：国家科技支撑计划课题资助项目(2012BAJ01B03)

摘　　要：文章围绕北京城市地下道路立交隧道设计施工中亟待解决的横纵向合理间距确定这一关键问题,以城市地下道路三车道隧道为例,基于北京城区地质条件的分层概化,采用数值模拟方法计算分析了30种工况(5种竖向间距和6种水平间距)下围岩变形规律与稳定性特点,指出竖向间距和水平间距对地表沉降、立交部位洞周位移和地层塑性区等的影响规律,提出了建议的立交隧道横纵向合理间距和结构加强范围。结果表明,水平间距对立交隧道地层变形影响显著,宜取1倍隧道洞径以上;且无论水平间距多大,受立交隧道施工影响较为显著的区域主要集中在距立交中心点3倍洞径的圆形区域。Regarding the pending problem of reasonable transverse and longitudinal spacing during the design and construction of the interchange tunnels of urban underground road in Beijing, and using a 3-lane tunnel as an example, the deformation law and stability characteristics of surrounding rocks under 30 kinds of working conditions （5 kinds of longitudinal spacing and 6 kinds of transverse spacing） are analyzed using a numerical simulation method based on an hierarchical generalized model of geological conditions in the Beijing area. The influence law of transverse and longitudinal spacing on ground settlement, tunnel displacement at the interchange and plastic zone is deduced. Recommended values for reasonable spacing in the transverse and longitudinal directions and the reinforced support zone are proposed for underground interchange tunnel. Results show that the transverse spacing has significant effects on the ground deformation of interchange tunnels, and the spacing should be greater than 1 time the tunnel diameter （1D）; moreover, no matter how great the transverse spacing is, the area affected by interchange tunnel construction is concentrated in a circular region in a distance 3 times the tunnel diameter （3D） from the center of the interchange.

关 键 词：城市地下道路 立交隧道 合理间距 数值模拟 变形控制 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]