逆断层作用下埋地连续钢管的力学性能  

Mechanical Properties of Buried Continuous Steel Pipe Under Reverse Fault

作　　者：赵旭[1] 崔建阳 钟紫蓝 杜修力[1] ZHAO Xu;CUI Jianyang;ZHONG Zilan;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《北京工业大学学报》2022年第7期729-738,共10页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51978020);广东省地震工程与应用技术重点实验室开放基金资助项目(2017B030314068)。

摘　　要：为了解决黏土中逆断层错动下埋地钢管的力学性能问题,采用有限元软件建立三维非线性管土相互作用数值分析模型,分析逆断层错动对穿越断层的埋地钢管的影响机理,给出不同断层倾角下、不同管道内压下和不同管道径厚比下3种典型失效模式,即:管道的受拉失效、局部屈曲和横截面过度变形,所对应的临界逆断层错动量.结果表明:当逆断层倾角为75°时,管道发生局部屈曲破坏所需的断层位错量最小,为管道跨逆断层最不利倾角;较大的管道内压,可有效抑制管道横截面过度变形,且随管道内压逐渐增大,管道的控制失效模式由管壁局部屈曲变为受拉失效;增加管道径厚比可显著提高管道的抗变形能力.The purpose of this paper is to investigate the mechanical behavior of the buried steel pipeline in clay subjected to the reverse fault movement based on three-dimensional nonlinear finite element simulation of the soil-pipe interaction system.Based on the numerical study of the influences of different fault dip angles and internal pressures and pipe diameter-thickness ratios on the behavior of the pipeline,three typical failure modes:tensile failure of pipeline,local buckling and excessive deformation of cross section were identified and the corresponding critical reverse fault displacements were obtained in this study.The numerical results show that when the fault dip angle is 75°,the pipeline suffer local buckling failure with the smallest reverse fault movement,indicating that 75°is the most unfavorable dip angle.Moreover,large internal pressure can effectively reduce the excessive cross-sectional deformation of the pipeline.With the increase of internal pressure,the critical failure mode of the pipeline changes from local buckling to tensile failure of the pipeline.Finally,increase of the diameter-thickness ratio of the pipeline can significantly improve the performance of the pipeline subjected to reverse fault movement.

关 键 词：埋地钢管 逆断层 断层位移 失效模式 力学性能 数值模拟 

分 类 号：TE832[石油与天然气工程—油气储运工程] TU968[建筑科学]