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埋管失稳分析的阿姆斯图兹法影响因素及应用条件

陈玮,张伟,张小飞,刘林林   

  • 出版日期:2019-01-28 发布日期:2019-01-28

Influential factors and application conditions of Amustutz′s method for evaluation of critical external pressure of embeded pipe

CHEN Wei,ZHANG Wei,ZHANG Xiaofei,LIU Linlin   

  • Online:2019-01-28 Published:2019-01-28

摘要: 为给出埋藏式压力管道抗外压稳定分析的阿姆斯图兹法(简记阿氏法)使用建议,剖析了其临界外压计算的影响因素和应用条件。统计了阿氏法主要影响因素,即埋管径厚比、缝隙率和屈服强度的国内工程实例的数据,进而研究了这3种影响因素在工程实例范围内对阿氏法临界外压计算值的影响规律。对比了阿氏法简化公式与原公式的计算精度,结合强度破坏模式开展了阿氏法应用条件研究,给出了基于管道径厚比数值的阿氏法选用建议,并用试验数据进行了验证分析。研究表明:径厚比小于35时,需同时考虑抗外压稳定和抗外压强度校核,抗外压稳定的临界外压宜采用阿氏法原公式分析;径厚比在35~60之间时,建议采用阿氏法原公式以保证计算精度;径厚比大于60时,可采用阿氏简化公式提高计算效率。

关键词: 埋藏式压力管道, 抗外压稳定, 阿姆斯图兹法

Abstract: To give reasonable application recommendations of Amustutz′s method (AM) in buckling analysis for embeded pipe, the influential factors and application conditions in evaluation of critical external pressure were illuminated. Statistics on the domestic and abroad engineering sectors of AM′s main influential factors, i.e. radius-thickness ratio, gap ratio and yield strength of tunnel linings were collected. The influences of the three factors on AM′s results were clarified in practical cases. The calculation accuracy of AM′s simplified formulas was compared with that of original formulas, and application conditions were analyzed considering strength failure mode. The application recommendations of AM were given in term of radius-thickness ratio and verified by experiment. It can be concluded that the performance against buckling and anti-external pressure strength should be checked when the radius-thickness ratio is less than 35, and the AM′s original formulas are suggested in the buckling check. The AM′s original formulas are also suggested for ensuring the calculation accuracy when the radius-thickness ratio is 35 to 60, and the AM′s simplified formulas are suggested when the radius-thickness ratio is larger than 60.

Key words: buried pressure pipeline, anti-external pressure stability, Amstutz′s method