直埋热水供热管道三通热-力耦合分析.pdf

第 48 卷 第 4 期 西安建筑科技大学学报（自然科学版） Vol.48 No.4 2016 年 8 月 J.Xian Univ. of Arch. Tech. (Natural Science Edition) Aug. 2016 DOI ：10.15986/j.1006-7930.2016.04. 021 直埋热水供热管道三通热-力耦合分析 江 超 1 ，官燕玲 1 ，邓顺熙 1 ，王 军 2 (1. 长安大学环境科学与工程学院，陕西 西安 710054 ；2. 西安市热力总公司，陕西 西安 710016) 摘要：针对直埋热水供热管道三通受力的复杂性，基于土弹簧模型建立了热-力耦合有限元模型，分析了直埋三通应力的主 要影响因素，并给出了简化三通接管长度的热-力耦合有限元模型．建模中管土相互作用考虑了介质本身的重量和覆土重力 等的作用，三通管段的边界条件施加在主管和支管端头．结果表明，直埋三通在温升作用下，相贯区峰值应力较大；直埋三 通的二次应力随温升、管道壁厚、支管管径、主管过渡段长度变化，而受内压影响较小；地面荷载作用使三通最大当量应力 减小，对三通起保护作用．该结果旨在为直埋管道的安全性提供帮助． 关键词：直埋供热管道；三通；热-力耦合；有限元分析 中图分类号：TU995 文献标志码：A 文章编号：1006-7930(2016)04-0585-08 Analysis on the T- joint thermal coupling for directly buried heating pipeline 1 1 1 2 JIANG Chao , GUAN Yanling , DENG Shunxi , WANG Jun (1. School of Environmental Science and Engineering, Chang′an University, Xi′an 710054，China; 2. Parent Company of Xi′an District Heating, Xi′an 710016，China) Abstract: To study the complicated stress characteristics of T- joints in directly buried heating pipelines, a thermal-mechanical coupled finite element model was constructed using the soil spring model. The main affecting factors on stress distribution of directly buried T- joints were analyzed. A thermal-mechanical coupled finite element model for T- joints with reduced straight pipe lengths was given. The weights of thermal medium and covering soil were considered in the pipe-soil interaction of the model. The boundary conditions were applied to the ends of the main pipes and the branch. The results indicate that the junction area of buried T-