荷载与温度耦合作用下隧道截面形状对衬砌结构力学性能的影响

发布时间：2018-05-08 14:50

本文选题：隧道工程 + 衬砌　；参考：《武汉理工大学学报》2014年01期

【摘要】：为研究隧道不同截面形状对衬砌结构力学性能的影响,采用荷载-结构法建立隧道衬砌温度场计算模型,并根据双正弦函数叠加气温变化模型,分析了圆形、矩形、直墙圆拱形和椭圆形等衬砌截面的温度场分布特征;以隧道衬砌混凝土损伤塑性模型及顺序耦合应力法为基础,分析了隧道衬砌在围岩荷载与变温耦合作用下不同隧道截面形状的衬砌受力特征及位移变化规律。结果表明,隧道空气温度变化对衬砌结构应力影响较大,衬砌应力随温度变化呈正弦变化趋势,但对衬砌位移影响较小;在相同的计算参数、初始条件及边界条件下,不同的隧道衬砌截面形状对衬砌受力、位移、产生时间与位置均有较大影响;从受力状态及结构安全性看,圆形和椭圆形截面是较好的衬砌截面形式。
[Abstract]:In order to study the influence of different section shape of tunnel on the mechanical properties of lining structure, the calculation model of tunnel lining temperature field is established by load-structure method, and the circle and rectangle are analyzed according to double sinusoidal function superposition temperature change model. The temperature field distribution characteristics of circular arch and ellipse lining sections of straight wall are based on the damage plastic model of tunnel lining concrete and the sequential coupling stress method. The stress characteristics and displacement variation of tunnel lining with different cross-section shapes under the coupling of surrounding rock load and variable temperature are analyzed. The results show that the variation of tunnel air temperature has great influence on the stress of lining structure, and the lining stress has a sinusoidal trend with the change of temperature, but has little effect on the displacement of lining, and under the same calculation parameters, initial conditions and boundary conditions, Different section shapes of tunnel lining have great influence on the force displacement time and position of the lining and the circular and elliptical sections are the better ones from the point of view of the stress state and structural safety.
【作者单位】：长安大学公路学院;西南科技大学环境与资源学院;
【基金】：“十二五”国家科技支撑计划(2011BAE27B04) 国家自然科学基金(51308062) 中国博士后科学基金(2013M540726)
【分类号】：U451

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