铁道科学与工程学报2016，Vol.13Issue(5)：921-928,8.
基岩脱空条件下仰拱结构疲劳寿命的计算方法
Fatigue life calculation method of tunnel base structure under the conditions of bedrock void
摘要
Abstract
Due to tunneling construction disturbance and long-term cyclic heavy haul train loading,the void of surrounding rock may appear at the bottom of tunnel.The conditions of bedrock void affect the fatigue life of tun-nel base structure.In the paper,the softening of surrounding rock at the bottom of heavy-haul tunnel was intro-duced into the fatigue life analysis and dynamic response of the base structure.The analyses were carried out by using the finite element method.Based on the vertical load induced by train vibration and the linear cumulative damage theory,the fatigue life prediction of tunnel base structure was established to study the influence of the bed situation on the force status of railway tunnel base structure.The results show that the maximum value of ten-sile stress emerges at the center of the invert,so does the compressive stress at the junction of the sidewall and invert.The distribution of dynamic response of the base structure is similar under different conditions of bedrock void.As the void extent increases,the tensile stress and pressure stress amplitude of the base structure increase, and the fatigue life of the base structure is also reduced greatly.关键词
底部结构/疲劳寿命/动力响应/重载列车荷载Key words
base structure/fatigue life/dynamic response/heavy haul train loading分类
交通工程引用本文复制引用
刘宁,彭立敏,施成华..基岩脱空条件下仰拱结构疲劳寿命的计算方法[J].铁道科学与工程学报,2016,13(5):921-928,8.基金项目
国家重点基础研究发展计划（973计划）项目（2011CB013802）；国家自然科学基金煤炭联合基金资助项目（U1361204）；国家自然科学基金资助项目 （）
