列车动载作用下复杂岩溶隧道受力特性分析  

Analysis on Train Vibratory Response of Complex Multi-Arch Tunnel in Karst Region

作　　者：陈松洁[1] 彭立敏[1] 丁祖德[1] 李兴龙[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《江南大学学报（自然科学版）》2010年第3期308-313,共6页Joural of Jiangnan University (Natural Science Edition)　

基　　金：铁道部科技研究开发计划重大项目(2008G031-17)

摘　　要：论述了隧道衬砌-围岩系统动力分析的理论及计算方法,采用激振函数模拟列车竖向移动荷载,建立岩溶段连拱隧道的三维有限差分计算模型,分析了拱梁和直梁两种不同溶腔跨越方案中隧道结构变形和受力特性的差异。计算结果表明,两种不同跨越方式下隧道衬砌结构受力变形均满足规范要求。就跨越梁结构本身的受力特性而言,拱梁结构略有优势;但从施工安全性和经济性角度综合考虑,推荐采用直梁跨越方案。A theory of dynamic theory and a numerical method for the lining structure of tunnels and surrounding rock systems are put forward.Based on the numerical simulation of vertical load induced by train with excitation function,a three-dimension finite difference model of multi-arch tunnel in karst region is established to study the differences of the force and deformation between arch beam and straight beam which are used to step across the solution crevice.The results show that both the force and deformation of tunnel structure of the two different modes meet the requirements of specifications.From the force characteristics of beam structure itself,the arch beam structure has obvious advantage.But in view of safety and economy in the process of construction,the straight beam is more suitable.

关 键 词：振动荷载 连拱隧道 岩溶 拱梁 直梁 

分 类 号：U451.3[建筑科学—桥梁与隧道工程]