Safety evaluation of gas pipelines with defects under surface load

doi:10.16265/j.cnki.issn1003-3033.2021.10.018

Abstract

Abstract: In order to study mechanical properties and failure behavior of gas pipelines with defects under surface load, a safety evaluation method for them was proposed. Firstly, a pipe-soil interaction model for gas pipelines with volume defects under surface load was established by utilizing general nonlinear finite element software ANSYS. Then, their failure mechanism under the load was revealed, and impacts of parameters, such as internal pressure, defect location, defect depth and length, on failure process were analyzed. The results show that these gas pipelines with defects fail under surface load since Mises stress at defect position and arching line position at both sides exceeds yield limit. Factors like internal pressure, defect location, defect depth will directly affect critical failure load of pipelines, and they are prone to fail at 0° position. Moreover, their safety evaluation curve can be obtained by calculating critical failure load under combined working conditions.

Key words: surface load, gas pipeline, volume type defect, safety evaluation, safety evaluation curve

CLC Number:

X944

LIU Xiaoben, WANG Baodong, ZHANG Dong, ZHANG Hong. Safety evaluation of gas pipelines with defects under surface load[J]. China Safety Science Journal, 2021, 31(10): 127-135.

References

[1] 陈文. 油田占压管线的解决措施[J]. 油气田地面工程, 2012, 31(6):70.
[2] 任波, 李学平, 廖晓, 等. 天然气长输管道沿线违章占压安全隐患整治探析[J]. 科技与企业, 2014(15):222.
[3] 王庆余, 王宁, 李夏喜,等. 北京燃气管网外腐蚀泄漏的关键影响因素[J]. 腐蚀与防护, 2020, 41(5):54-56.
WANG Qingyu, WANG Ning, LI Xiaxi, et al. Key factors affecting corrosion leakage of Beijing gas pipeline [J]. Corrosion & Protection, 2020, 41(5):54-56.
[4] 郭晓军. HDPE管道在水平定向钻进回拖中的变形损坏机理及数值模拟[D]. 成都:成都理工大学, 2011.
GUO Xiaojun. The deformation and failure mechanism of HDPE pipes in horizontal directional drilling back to the traile and the numerical simulation [D]. Chengdu: Chengdu University of Technology, 2011.
[5] 孙世梅, 高小迪, 孙赫,等. 天然气管道施工事故行为原因研究[J]. 中国安全科学学报, 2020,30(6):8-13.
SUN Shimei, GAO Xiaodi, SUN He, et al. Study on causes of accidents in construction of nature gas pipelines [J]. China Safety Science Journal, 2020,30(6):8-13.
[6] 帅健, 王晓霖, 叶远锡,等. 地面占压荷载作用下的管道应力分析[J]. 中国石油大学学报:自然科学版, 2009, 33(2):99-103.
SHUAI Jian, WANG Xiaolin, YE Yuanxi, et al. Stress analysis of pipeline subject to surface load [J]. Journal of China University of Petroleum: Edition of Natural Science, 2009, 33(2):99-103.
[7] 陈国华, 王番, 李明阳,等. 温度与占压综合作用下埋地含缺陷聚乙烯管道数值分析[J]. 中国塑料, 2019, 33(3):56-61.
CHEN Guohua, WANG Fan, LI Mingyang, et al. Numerical analysis of buried defective polyethylene pipeline under combined loads of temperature and surface [J]. China Plastics, 2019, 33(3):56-61.
[8] FANG Hongyuan, TAN Peiling, DU Xueming, et al. Mechanical response of buried HDPE double-wall corrugated pipe under traffic-sewage coupling load[J]. Tunnelling and Underground Space Technology, 2020, 108(9):DOI:10.1016/j.tust.2020.103664.
[9] WU Ying, XIAO You, ZHA Sixi. Mechanical behavior analysis of buried polyethylene pipe under land subsidence [J]. Engineering Failure Analysis, 2019, 108:DOI: 10.1016/j.engfailanal.2019.104351.
[10] SABOVA F, SERGIO T, REIS R M, et al. Centrifuge and numerical modeling of moving traffic surface loads on pipelines buried in cohesionless soil[J]. Transportation Geotechnics, 2020, 23(8):DOI: 10.1016/j.trgeo.2020.100340.
[11] ZHANG Jie, LIANG Zheng, HAN Chuanjun. Numerical simulation of pipeline deformation caused by rock fall impact [J]. The Scientific World Journal, 2014(1):161898.
[12] 殷鹰,蓝朝逊,李俊,等.埋地PE燃气管道地质沉降破坏数值分析[J].中国安全科学学报,2019,29(10):18-23.
YIN Ying, LAN Chaoxun, LI Jun, et al. Numerical analysis of geological settlement failure of buried PE gas pipeline[J]. China Safety Science Journal,2019,29(10):18-23.
[13] 郑津洋, 鲁顺利, 马津津,等. 占压下埋地聚乙烯管力学响应的数值模拟[J]. 中国塑料, 2014, 28(1):60-64.
ZHENG Jinyang, LU Shunli, MA Jinjin et al. Numerical simulation of mechanical response of buried polyethylene pipe under surface load [J]. China Plasyics, 2014, 28(1):60-64.
[14] 韩烨, 孙伟栋, 席少龙,等. 含腐蚀缺陷占压管道的安全评估[J]. 油气储运, 2019, 38(2):137-144.
HAN Ye,SUN Weidong,XI Shaolong, et al. Safety assessment on buried pipeline subjected to ground load and corrosion defect [J]. Oil & Gas Storage and Transportation, 2019, 38(2):137-144.
[15] 周立国,姚安林,徐涛龙,等.挖掘载荷下燃气PE管道损伤分析[J].中国安全科学学报,2017,27(3):59-64.
ZHOU Liguo, YAO Anlin, XU Taolong, et al. Damage analysis of urban gas PE pipeline under excavation load[J]. China Safety Science Journal, 2017,27(3):59-64.
[16] TAFRESHI S, KHALAJ O. Laboratory tests of small-diameter HDPE pipes buried in reinforced sand under repeated-load [J].Geotextiles and Geomembranes, 2008, 26(2):145-163.
[17] LIU Pengfei, ZHENG Jinyang, et al. Failure analysis of natural gas buried X65 steel pipeline under deflection load using finite element method [J]. Materials & Design, 2010, 31(3):1 384-1 391.
[18] 马津津. 典型复杂载荷条件下埋地聚乙烯管强度的数值模拟[D]. 杭州:浙江大学, 2013.
MA Jinjin. Numerical simulation of strength of buried polyethylene pipe under typical complex loading [D]. Hangzhou: Zhejiang University, 2013.
[19] 任建东, 王文, 董淼, 等. 开采沉陷区埋地管道变形及力学特征分析[J]. 中国安全科学学报, 2020, 30(10):86-93.
REN Jiandong, WANG Wen, DONG Miao, et al. Analysis of deformation and mechanical characteristics of buried pipelines in mining subsidence areas [J]. China Safety Science Journal, 2020, 30(10):86-93.
[20] 李勐, 张宏, 王宝栋,等. 基于有限元的含腐蚀缺陷P110油管失效分析与安全评价[J]. 中国安全生产科学技术, 2016, 12(11):93-99.
LI Meng, ZHANG Hong, WANG Baodong, et al. Failure analysis and safety evaluation on P110 oil tube containing corrosion defects based on finite element method [J]. Journal of Safety Science and Technology, 2016, 12(11):93-99.
[21] 李云涛,张振永,刘玉卿,等. 天然气管道全管径断裂事故影响范围研究[J]. 中国安全科学学报, 2020, 30(9):153-158.
LI Yuntao, ZHANG Zhenyong, LIU Yuqing, et al. Influence range of full-bore rupture accidents of natural gas pipelines [J]. China Safety Science Journal, 2020, 30(9):153-158.