铁道标准设计2019，Vol.63Issue(3)：105-111,147,8.DOI:10.13238/j.issn.1004-2954.201804200007
铁路隧道基底脱空条件下的动力响应分析
Dynamic Response of Base Void Area of Railway Tunnel
摘要
Abstract
The train load is the main cause of induced basal defects in the tunnel.In order to analyze the response of the base void area to train loads, the normal section of Class Ⅲ surrounding rock of a railway tunnel project is taken as the research object.The pressure box is buried on the top surface of the tunnel bedding to test the stress of the concrete floor.The stress distribution law of the center line of the tunnel bottom, the track line and the end of the sleeper, and the bottom surface vibration characteristics are analyzed under different loads.The results show that the dynamic pressures on the top tunnel bedding are 80 kPa, 20 kPa and 60 kPa respectively at the track, the end of sleeper and the bedding center.The calculation and simulation indicate that when 40 cm and 80 cm wide void areas exist at the tunnel bedding, the stresses remain the same pattern at the above mentioned three places, and the stress increases first and then decreases in the void area.The stress changes abruptly at the track and concentrates at the sidewalls of the void area, and the affected depth of the void area is about 2 m.The numerical comparison between 80 cm wide void area and 40 cm wide void area shows that the maximum amplification reaches 50％, 30％ and 3％ respectively in terms of base dynamic stress, acceleration and vibration displacement.关键词
铁路隧道/动应力/基底脱空/列车荷载/数值分析Key words
Railway tunnel/Dynamic stress/Basement void/Train load/Numerical analysis分类
交通工程引用本文复制引用
李又云,折惠东,赵越超,崔齐飞,张庭顺..铁路隧道基底脱空条件下的动力响应分析[J].铁道标准设计,2019,63(3):105-111,147,8.基金项目
陕西省自然科学基金 (2016JM5090) （2016JM5090）
西安铁路局重点研究项目 (S20160906-002) （S20160906-002）
