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。
In order to study the influence of tunnel with different cross-section shapes on structural mechanical properties of tunnel lining, the temperature filed calculation model of tunnel lining was established by the load-structure method and the temperature distribution characteristics with circular, rectangular, straightwall and elliptic cross-sections were studied. And the daily temperature was modeled by two sinusoidal functions. Based on the damaged plasticity model of concrete and sequential coupling stress method, the stress characterization and displacement law of tunnel lining with different cross-sections were analyzed under the coupling interaction of surrounding rock load and temperature load. The experimental results show that, firstly the stress of tunnel lining is significantly influenced by the ambient temperature showing a sinusoidal change trend, but its displacement is almost temperature-independent. Secondly the different crosssection shapes also have significantly influence on stress, displacement, starting time and location under the same calculation parameters, initial conditions and boundary conditions, and then the circular and elliptic shapes show better performances in view of the stress state and structure security of tunnel lining.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第1期102-107,共6页
Journal of Wuhan University of Technology
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)
关键词
隧道工程
衬砌
截面形状
荷载与温度耦合
环向应力
tunnel engineering
tunnel lining
cross-section shape
load-temperature coupling
circumferential stress
