桥隧搭接工程多源损伤及车辆冲击模型试验研究  

Model tests for multi-source damages and vehicle impacts of a bridge and tunnel lap joint project

作　　者：孙广臣[1,2] 傅鹤林[1] 巢万里[1,3] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]中冶长天国际工程有限责任公司,长沙410007 [3]湖南省交通科学研究院,长沙410015

出　　处：《振动与冲击》2013年第2期115-123,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(50878213);贵州省重大科技专项项目(2008015);湖南省交通建设计划项目(200928)

摘　　要：分析了Ⅳ、Ⅴ级围岩条件下的桥隧搭接工程的特点及多源损伤机理,并在此基础上成功研制了相关模型试验装置和测试方法。通过模型试验及对试验结果的分析和研究,得出以下结论:运营中搭接处的汽车荷载及其冲击作用,会对桥梁、隧道各关键部位及洞周围岩等产生明显不利影响,长期状况下易使桥梁、隧道的各关键部位产生损伤,因而影响桥梁结构、隧道衬砌、桩基础的耐久以及洞口围岩的稳定。因此,应采取措施减小汽车荷载及其冲击的影响,如对桥、隧及围岩关键部位采取局部加强措施,或采用桩基础,减小桥梁跨径,加大搭接长度等。Characteristics and multi-source damage mechanism of a bridge and tunnel lap joint project under grade IV or V of surrounding rocks were analyzed. On this basis, the related model test equipments and test methods were successfully developed. Model tests and its results indicated that vehicle loads and impact actions during the project operation stage have obvious harmful effects on bridge, tunnel and surrounding rocks nearby the entrance, these effects may cause damages of key parts of bridge or tunnel in long run, and therefore do harm to the durability of bridge, tunnel lining, pile foundation or the stability of surrounding rocks ; consequently, some measures should be taken for the purpose of reducing the influence caused by vehicle loads and impact, such as, strengthening key parts of bridge, tunnel lining and surrounding rocks nearby the entrance, or using pile foundation, decreasing bridge span, lengthening the lap joint period and so on.

关 键 词：桥梁 隧道 搭接工程 模型试验 车辆冲击 多源损伤 力学行为 

分 类 号：TU317.1[建筑科学—结构工程] U448.14[建筑科学—桥梁与隧道工程]