中南大学学报（自然科学版）2013，Vol.44Issue(7)：2942-2949,8.
铁路隧道基底状况对底部结构受力状态的影响
Influence of bed situation on force status of railway tunnel base structure
摘要
Abstract
Based on the numerical simulation of vertical load induced by train vibration and damage constitutive model for concrete,a finite difference model that takes the interaction between tunnel base structure and bedrock into consideration was established to study the influence of the bed situation on the force status of railway tunnel base structure.The results show that the force is small when the base structure and bedrock are in good contact,and the new damage that caused by train vibration will not appear on the structure,the dynamic response and damage of tunnel base structure increases obviously with the increase of foundation void distance; the change intensifies when the void distance is above the critical depth until vibration failure; the distinct types correspond to distinguishable critical condition and failure forms.Meanwhile,the worse the conditions of bedrock,the greater the deformation,force and damage of the base structure are.The results of analysis provide rational parameters to design and maintenance of the base structure in railway tunnel.关键词
铁路隧道/底部结构/动力响应/损伤Key words
railway tunnel/ base structure/ dynamic response/ damage分类
交通工程引用本文复制引用
丁祖德,彭立敏,施成华,黄娟,刘光明..铁路隧道基底状况对底部结构受力状态的影响[J].中南大学学报（自然科学版）,2013,44(7):2942-2949,8.基金项目
国家重点基础研究发展计划项目(2011CB013802) （2011CB013802）
国家自然科学基金资助项目(51108461) （51108461）
铁道部科技研究开发计划课题(2008G031-17-4) （2008G031-17-4）
昆明理工大学人才培养计划项目(KKSY201306057) （KKSY201306057）
