不同埋深铁路隧道仰拱受力特征研究  

Research on Stress Characteristics of Inverted Arch of Railway Tunnel in Different Buried Depth

作　　者：宋瑞霞 赵永虎 SONG Rui-xia;ZHAO Yong-hu(School of Civil Engineering,Lanzhpu Petrochemical College of Vocational Technology,Lanzhou 730060,China;Northwest Research Institute Co.Ltd.of CREC,Lanzhou 730000,China)

机构地区：[1]兰州石化职业技术学院土木工程学院,兰州市730060 [2]中铁西北科学研究院有限公司,兰州市730000

出　　处：《公路》2021年第2期312-316,共5页Highway

基　　金：国家自然科学基金项目,项目编号51868038;中国铁路总公司科技研究开发计划课题项目,项目编号2017G007-G。

摘　　要：以董志塬区银西高铁黄土隧道为例,对不同埋深条件下隧道仰拱的基底接触压力和钢拱架应力随时间的变化规律、空间分布特征及其差异性进行了对比研究。研究结果表明,浅埋隧道基底接触压力变化时间较深埋隧道略长;不同埋深隧道仰拱处最小基底接触压力均出现在拱底中心处,最大基底接触压力均出现在拱脚处,且同一部位浅埋隧道基底接触压力明显大于深埋隧道基底接触压力;在仰拱的同一部位处,深埋隧道钢拱架应力明显大于浅埋隧道钢拱架应力;仰拱部位钢拱架承受压应力为主,浅埋黄土隧道仰拱部位的钢拱架最大压应力出现在拱底中心,可达约12MPa;而深埋隧道拱脚部位的钢拱架压应力最大,可达26~33MPa。研究结果可为黄土隧道仰拱设计优化与施工提供参考。Taking the tunnels across loess areas in the Dongzhiyuan area of Yinchuan-Xi\an Highspeed Railway as example,the change rule of contact pressure beneath foundation and the stress of steel arch with time,the spatial distribution characteristics and their differences under the conditions of different buried depth are studied.The results show that the change time of contact pressure beneath foundation of shallow tunnel is slightly longer than that of deep tunnel;the minimum contact pressure beneath foundation appears at the center of the arch bottom,and the maximum contact pressure beneath foundation appears at the arch foot,moreover,the contact pressure beneath foundation of the shallow-buried tunnel in the same location is obviously greater than that of the deep-buried tunnel;in the same position of inverted arch,the stress of steel arch in deep-buried tunnel is obviously larger than that of in shallow-buried tunnel;the steel arch at the inverted arch mainly bears the compressive stress,the steel arch at the bottom of shallow-buried tunnel has the highest compressive stress,which can reach about 12 MPa,and the steel arch foot of deep-buried tunnel has the highest compressive stress,which can reach 26~33 MPa.The study results can provide reference for the design optimization and construction of loess tunnel invert.

关 键 词：黄土隧道 仰拱 受力特征 基底接触压力 钢拱架应力 现场试验 

分 类 号：U451[建筑科学—桥梁与隧道工程]