高温引水隧洞应力场分布的研究  

Study on the Distribution of Stress Field in High-temperature Diversion Tunnels

作　　者：刘春龙[1] 张永生[2] 袁继国[1] 钟源 张耀 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]中交天津航道局有限公司,天津300000 [3]西部机场集团,陕西西安710075 [4]陕西煤田地质勘查研究院有限公司,陕西西安710000

出　　处：《水利与建筑工程学报》2015年第4期66-71,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然基金重点资助项目(05JS34)

摘　　要：研究高温隧洞在温度稳定时,达到热平衡条件下的温度场及其引起的温度应力与隧洞自重应力的耦合分布形式。通过应用弹性力学中无限长圆筒对称温度应力的解析解与有限差分软件对温度场的分析,得出温度场及隧洞径向应力σρ、环向应力σφ和轴向应力σz的分布形式,表明在变温区,径向应力σρ呈先增大后减小趋势,环向应力σφ沿着洞径方向由拉应力变化为压应力,轴向应力σz沿着洞径方向为压应力增大。模拟温度应力与自重应力耦合作用下在隧洞水平边墙和洞室顶部的应力分布规律。表明在两个不同位置处的耦合应力分布明显不同,环向应力σφ在水平边墙处为压应力,且逐渐增大后趋于稳定,而在隧洞顶拱处为拉应力,逐渐变为稳定温度区的压应力。隧洞洞顶拱处的混凝土衬砌在耦合应力作用下处于拉应力状态,在环向拉应力作用下极易产生裂缝。This research focuses on the coupling distribution of temperature stress caused by temperature field and tunnel gravity stress under the thermal equilibrium condition when the temperature in the high temperature tunnel reaches plateau and stabilizes. The distribution of the radial stress, circular stress and axial stress of the temperature field and the tunnel were obtained through the infinite long cylindrical symmetry temperature stress analytical solutions based on elastic me- chanics and the analysis of temperature field by finite difference software. The results showed that in the temperature vari- ation zone, the radial stress first increased and then decreased, the circular stress changed from tensile stress to compres- sive stress towards the direction of the tunnel, axial stress posed as the increasing compressive stress along the direction of the tunnel. And then the stress distribution of the level tunnel wall and the ceiling under the coupling action of tempera- ture stress and gravity stress was simulated. It was found that the coupling stress distribution at the two different locations were totally different. The circular stress presented as compressive stress at the level wall, and it increased then stabi- lized, while at the arch of the ceiling it presented as tensile stress and then changed gradually into compressive stress at the stable temperature zone. Under the coupling stress, the concrete lining at the ceiling arch was under tensile stress, it would crack easily when under circular tensile stress. This analysis has some referential significance to the practical engi- neering.

关 键 词：高温隧洞 温度分布 应力分布 数值分析 耦合分析 

分 类 号：TV672.1[水利工程—水利水电工程]