摘要
海底管线在温度应力作用下的屈曲变形问题是管线设计的关键性问题之一.结合实际工程,探讨了管线屈曲变形的计算方法,分析了温差、地基土特性、管线埋深和膨胀弯设置等因素对管线屈曲变形的影响,并初步探讨了考虑初始缺陷管线的稳定性分析方法和工程对策.结果表明,管线中的应力随着温差的增加、地基土体摩阻力的增大及管线上覆土厚度的增长而增大,设置膨胀弯可以使其端部一定范围内的管线自由变形,从而释放由于温差和压差作用在管线内产生的附加应力.当管线有足够的埋深时,不发生竖向的屈曲变形.降低温度和增加埋深等措施能够有效防止管线屈曲.
More attentions have been paid to upheaval of marine pipelines caused by temperature stress. In association with the practical pipeline project, an approach for estimating the upheaval tendency has been established. The factors that may cause pipeline buckling, such as difference in temperature, properties of groundsill, buried depth and expansion bend are discussed. Some available engineering countermeasures have been recommended for a pipeline design. Furthermore, the effect of imperfections is discussed and the theoretical solutions are illustrated by presenting a procedure. The results show that stresses in the pipeline rises with the increase of temperature difference, friction between the pipeline and subsoil, and the buried depth. Expansion bend can help the end of the pipeline to extend freely and to relax the stress induced by thermal stress. The calculating results show that some measures are effective on preventing the pipeline from buckling, such as reducing the temperature difference and increasing the buried depth, and the upheaval will not take place if the buried depth is large enough.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2005年第2期124-128,共5页
Journal of Tianjin University：Science and Technology
关键词
海底管线
屈曲
温差
地基土摩阻力
埋深
膨胀弯
marine pipelines
upheaval
temperature difference
friction between the pipeline and subsoil
buried depth
expansion bend
