管土接触作用下直埋供热管道折角的强度分析  

Strength analysis of directly buried heating pipeline with small angular deviations under the effects of pipe-soil contact

作　　者：赵文浩[1] 王飞[1] 王国伟[1] 雷勇刚[1] 

机构地区：[1]太原理工大学环境科学与工程学院,太原030024

出　　处：《中国科技论文》2017年第1期61-65,共5页China Sciencepaper

基　　金：住房和城乡建设部科学技术计划项目(2016-K4-079)

摘　　要：为探究折角应力变化规律,基于非线性有限元法,使用实体单元模拟管道与土壤,接触单元模拟管土相互作用,建立实际工况下折角的数值计算模型。计算并比较不同管径、壁厚、折角角度、压力等级等参数下折角的Mises应力值,得到不同参数下折角峰值应力的变化规律。分析结果表明,与实验及梁-土弹簧模型相比,管土接触模型能够较好地模拟折角的破坏。为扩大折角在供热工程中的应用范围,可通过限制折角角度、增加局部壁厚、改进回填土比例、提高土壤压实度等方式保护折角。As a common structural element of directly buried heating pipeline,small angular deviations may easily fail within the city heating network.To study the law of strength by the non-linear finite element method（FEM）,a numerical model under external load was developed,whereas the soil and pipe were simulated by solid elements and the interaction between pipeline and soil was simulated by contact elements.Changes and laws in peak Mises stress of the pipeline were determined through the calculation and comparison of stress under different characteristics like pipe diameter,wall thickness,angular radius etc.Case study showed that pipe-soil interaction model can accurately simulate the damage of pipeline as compared with experiment and the beam-soil spring model.To expand the applications of small angular deviations in heating engineering,it is possible to protect small angular deviations by increasing wall thickness,degree of compaction,limiting the radius,and improving the proportion of backfill.

关 键 词：市政工程 小角度折角 非线性有限元 管土接触 强度分析 

分 类 号：TU995.3[建筑科学—供热、供燃气、通风及空调工程]