车行横洞与隧道主洞交叉段局部失稳数值分析  

Numerical Analysis of Local Stability at Intersection Parts of Tunnel

作　　者：刘山洪[1] 陈寅春[1] 李刚[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2011年第2期217-220,共4页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：以重庆涪陵聚云山隧道车行横洞与主洞交叉段施工出现裂缝为工程背景,对隧道内结构受力行为复杂的交叉段,采用数值分析方法建立三维有限元模型,分析该处结构的变形及应力分布状态。分析结果表明:地应力和结构应力集中是导致局部开裂并影响交叉段稳定性的两大关键因素,通过对交叉段实施加固措施可有效地保证结构的稳定性,同时给出提高交叉段稳定性在设计和施工方面的建议。A case study was carried out in intersection parts between the main tunnel and the transverse tunnel for truck of Juyunshan Tunnel in Fuling,Chongqing.Distributions of deformation and stresses in these parts caused by complex forces were presented;numerical analysis method with 3D finite element model was employed.The analysis results indicated that earth gravity of tunnel and structural loads were mainly responsible for local cracking and stability of intersection parts.Safety of the structure and stability could be guaranteed by strengthening means in the parts;several proposals of improving the stability of intersection parts both in designing and constructing were presented.

关 键 词：隧道交叉段 稳定性 应力集中 屈服破坏 

分 类 号：U453[建筑科学—桥梁与隧道工程]