基底脱空条件下重载铁路隧道铺底结构疲劳性能试验研究  

Experimental study on fatigue performances of heavy haul railway tunnel’s pavement structure with base cavity

作　　者：王风[1] 刘聪[2,3] 彭立敏 雷明锋[2,4] 施成华[2] WANG Feng;LIU Cong;PENG Limin;LEI Mingfeng;SHI Chenghua(Shuohuang Railway Development Co.,Ltd.,Beijing 100000,China;School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330105,China;Key Laboratory of Engineering Structure of Heavy Haul Railway(Central South University),Changsha,410075,China)

机构地区：[1]朔黄铁路发展有限责任公司,北京100000 [2]中南大学土木工程学院,湖南长沙410075 [3]东华理工大学土木与建筑工程学院,江西南昌330105 [4]重载铁路工程结构教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2021年第10期2688-2693,共6页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978669,U1934211);湖南省自然科学基金资助项目(2021JJ30825);朔黄铁路发展有限责任公司科技创新项目(SHTL-19-21).

摘　　要：结合重载铁路隧道基底脱空病害特征,设计基底脱空条件下隧道铺底结构疲劳试验装置,并考虑隧道基底无水、富水环境等因素,开展隧道铺底脱空病害下的结构疲劳试验。基于试验结果的分析,探讨脱空条件下隧道铺底结构的疲劳演化特性,拟合得到300 mm脱空条件下隧道铺底结构试件疲劳寿命演化曲线。研究结果表明:基底脱空条件下,隧道铺底结构疲劳性能呈“倒S型”演化趋势,结构疲劳寿命随着应力水平增大而显著缩短;受地下水的影响,富水环境隧道底部结构疲劳寿命显著短于无水环境,且随着应力水平的升高,缩短的比例也越大;建立的基底脱空条件下隧道铺底结构疲劳寿命演化曲线,可用于隧道底部结构损伤状态的评价。In this paper,the fatigue test equipment of tunnel bottom structure with void was designed,and the fatigue test of tunnel bottom structure with void was carried out considering the factors of water-free environment and water-rich environment.Based on the analysis of the test results,the fatigue evolution characteristics of the tunnel bottom structure under the condition of cavity were discussed,and the fatigue life curve of the tunnel bottom structure specimen under the condition of 300mm cavitation was obtained.The results show that the fatigue performance of the structural specimens at the bottom of the tunnel shows an inverted S-shaped evolution trend,and the fatigue life of the structural specimens decreases significantly with the increase of the stress level.Under the influence of groundwater,the fatigue life of the bottom structure of the tunnel in the water-rich environment is significantly shorter than that in the water-free environment,and the proportion of fatigue life is shortened with the increase of stress level.The fatigue life evolution curve of tunnel bottom structure with void can be used to evaluate the damage status of tunnel bottom structure.

关 键 词：重载铁路隧道 隧道底部结构 疲劳寿命 基底脱空 

分 类 号：U25[交通运输工程—道路与铁道工程]