不同沉降方式下埋地管道力学响应试验研究  

Experimental study on the mechanical response of buried pipelines under different subsidence patterns

作　　者：张玉[1] 梁昊 林亮 周游 赵青松 ZHANG Yu;LIANG Hao;LIN Liang;ZHOU You;ZHAO Qing-song(College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Qingdao Fusion Bridgehead Development Co.,Ltd.,Qingdao,Shandong 266500,China;Chambroad Holding Group,Binzhou,Shandong 256599,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [2]青岛融合桥头堡开发有限公司,山东青岛266500 [3]山东京博控股集团有限公司,山东滨州256599

出　　处：《岩土力学》2023年第6期1645-1656,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51890914,No.52179119);山东省自然科学基金(No.ZR2019MEEO01);山西省自然科学基金(No.2021JM-373)。

摘　　要：地层塌陷和沉降引发的埋地管道事故频发,亟需开展不同沉降作用下力学响应试验研究。针对地层塌陷和沉降作用下油气埋地管道的管周应变、土压力和土体变形开展了系统研究。研究发现:地层塌陷和沉降过程中,受管顶土拱效应影响,管道应变及土压力随塌陷区扩展先增大后减小,随沉降区扩展而增大,塌陷和沉降区内,管道沿轴向呈两端凸起、中间下凹的“马鞍形”;管道变形受沉降影响更为显著,当塌陷和沉降量均为50 mm时,与地层塌陷相比,管道在沉降过程中顶部、底部和中部的最大应变值分别增加了18.8%、249%和273%;对比管周土压力增大和减小区域的面积之比λ可知,地层沉降较塌陷λ提高了78%,因此,管道在地层沉降过程中承受更大的作用力。基于修正Marston土压力计算模型,提出了地层沉降过程中管顶竖向土压力计算方法,并采用模型试验结果验证了该方法的准确性。The frequent occurrence of buried pipeline accidents caused by the ground collapse and subsidence makes it urgent to carry out experimental studies on the mechanical response under different subsidence effects.A systematical survey of the pipeline strain,earth pressure and soil deformation was conducted considering the effects of ground subsidence and collapse.The result showed that due to the arching effect at the top of the pipeline,the strain and earth pressure firstly increased and then decreased with the extension of the collapse zone,while they increased as the subsidence zone extended during the collapse and settlement.In the subsidence and collapse zones,the pipeline along the axial direction exhibited a saddle shape with both ends convex and concave in the middle.Pipeline deformation was more significantly affected by the subsidence.When the subsidence and collapse were both 50 mm,the maximum strain at the top,bottom and middle of the pipeline increased by approximately 18.8%,249%and 273%compared to the ground collapse,respectively.It could be seen by comparing the ratio of the increasing area to the decreasing area of earth pressure around the pipelineλthatλin the subsidence was increased by 78%compared with that in the collapse;therefore,the pipeline was subjected to larger earth pressure during the subsidence.Based on the modified Marston calculation model,a method for predicting the vertical earth pressure during ground subsidence was proposed,and the accuracy of the method was verified using the model test results.

关 键 词：油气管道 地层塌陷 地层沉降 管道应变 管周土压力 

分 类 号：TE832[石油与天然气工程—油气储运工程]