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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 cross-section shape on the mechanical properties of lining, the temperature-field calculation model of tunnel lining is established by using load-structure method. According to the temperature variation model of double-sine function, the circular, rectangular, Elliptical and other lining sections. Based on the damage plastic model of tunnel lining concrete and the method of sequential coupling stress, the liner characteristics and displacements of lining of different tunnel sections under the coupling of surrounding rock load and temperature and temperature are analyzed. The law of change. The results show that the change of tunnel air temperature has a significant influence on the stress of lining structure, and the stress of lining varies sinusoidally with temperature, but it has little effect on lining displacement. Under the same calculation parameters, initial conditions and boundary conditions, different tunnel linings The cross-sectional shape has a great influence on the stress, displacement, time and location of the lining. The circular and oval cross-sections are good lining cross-sections in terms of the state of stress and the structural safety.