软土沉降位移作用下大口径管道轴向应力状态研究  

Study on longitudinal stress state of large diameter pipeline under effect of soft soil settlement displacement

作　　者：季蓓蕾 刘啸奔 江金旭 易斐宁 武学健 刘玉卿[3] 张宏[1] JI Beilei;LIU Xiaoben;JIANG Jinxu;YI Feining;WU Xuejian;LIU Yuqing;ZHANG Hong(National Engineering Laboratory for Pipeline Safety,China University of Petroleum-Beijing,Beijing 102249,China;PipeChina North Pipeline Company,Langfang Hebei 065000,China;China National Petroleum Pipeline Engineering Co.,Ltd.,Langfang Hebei 065000,China)

机构地区：[1]中国石油大学(北京)油气管道输送安全国家工程实验室,北京102249 [2]国家管网集团北方管道有限责任公司,河北廊坊065000 [3]中国石油天然气管道工程有限公司,河北廊坊065000

出　　处：《中国安全生产科学技术》2021年第6期85-90,共6页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(52004314);新疆自治区天山青年计划项目(2019Q088);中国石油大学(北京)青年拔尖人才科研启动基金项目(2462018YJRC019);中国石油大学(北京)科研基金项目(2462020YXZZ045)。

摘　　要：为准确掌握大口径管道的轴向应力应变状态,保障管道的安全运行,通过假定4类不同形式的软土沉降位移,研究不同沉降形式对管道轴向应力状态的影响。采用非线性有限元方法建立管道轴向应力应变参数化数值计算模型,开展影响因素分析。结果表明:针对软土沉降位移作用下1422 mm X80大口径管道,沉降量相同时,突变型位移载荷作用下管道受到的轴向应力最大,最大轴向应力位于两侧非沉降区距管道中心约53 m处;软土沉降量达到工程实际中可能的最大值1 m时,大口径X80管道内轴向应力小于0.9倍管材屈服强度,管道环焊缝可以采用基于应力的工程适用性评估方法开展ECA(Engineering Critical Assessment)评价。In order to accurately grasp the axial stress-strain state of large diameter pipelines and ensure the safe operation of pipelines,the influence of different settlement forms on the axial stress state of pipeline was studied through assuming four types of soft soil settlement displacement with different forms.A parametric numerical calculation model of the axial stress-strain of pipeline was established based on the nonlinear finite element method,and the influencing factors were analyzed.The results showed that for the 1422 mm X80 large diameter pipeline under the soft soil settlement displacement,the axial stress of pipeline under the abrupt displacement load was the largest with the same settlement,and the maximum axial stress was located in the non-settlement zone on both sides about 53 m from the center of pipeline.When the settlement of soft soil reached 1m which was the possible maximum value of engineering practice,the axial stress in large diameter X80 pipeline was less than 0.9 times the yield strength of pipe material,and the ECA(Engineering Critical Assessment)evaluation can be carried out on the pipeline girth welds by applying the engineering suitability evaluation method based on stress.

关 键 词：中国南方地区 软土沉降 大口径管道 有限元分析 轴向应力 

分 类 号：X937[环境科学与工程—安全科学]