基于温度效应的隧道二次衬砌混凝土结构力学状态分析  

Mechanics State Analysis of Secondary Lining Concrete Structure on Tunnel Based on Temperature Effect

作　　者：罗彦斌[1] 陈建勋[1,2] 乔雄[2,3] 王梦恕[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [3]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《中国公路学报》2010年第2期64-70,共7页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200731881267);教育部新世纪优秀人才支持计划项目(NCET-07-0118)

摘　　要：为了研究寒冷地区隧道二次衬砌混凝土结构在环境温度变化情况下的力学状态,基于振弦式混凝土应变计的测试原理,提出温差引起的误差修正公式,并采用数值模拟的方法,对隧道二次衬砌混凝土的温度应力进行了分析。结合陕西省吴堡至子洲段高速公路刘家坪3号隧道现场二次衬砌混凝土应变监测数据,研究了1年内环境温度变化情况下隧道二次衬砌混凝土的结构受力。结果表明:在温度的影响下,混凝土内部在冬季产生了比较大的拉应力,混凝土内侧拱顶产生压应力,其余部位内侧产生拉应力;混凝土外侧拱顶和边墙部位产生了比较大的拉应力,最大值出现在拱顶部位;混凝土的内外侧应力最大值为1.01 MPa,接近C25混凝土的设计抗拉强度1.33 MPa。In order to study the mechanics state of secondary lining concrete structure on tunnel by ambient temperature changing in cold regions, based on test principle of the vibrational chord strain gauge, amended formula of test error caused by temperature changing was made, and the temperature stresses of secondary lining concrete on tunnel were analyzed by the methods of numerical simulation. Relied on the in-situ monitoring of secondary lining concrete strain on tunnel in Liujiaping No. 3 Tunnel in Wubu-Zizhou Expressway of Shaanxi Province, the forces on the structure of secondary lining concrete on tunnel were analyzed under the ambient temperature changing in one year. Result shows that the tensile stress produces in concrete inside by the temperature changing in winter; in the concrete inside, the compressive stress occurs in vault and the tensile stress occurs in other positions; in the concrete outside, the tensile stress produces in vault and side wall, and the biggest value occurs in vault; the maximal stress value of concrete inside and concrete outside is 1.01 MPa which is near the standard tensile strength of 1.33 MPa.

关 键 词：隧道工程 二次衬砌 数值模拟 温度应力 振弦式应变计 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]