摘要
为了分析采空区天然气管道的应力状态,基于ANSYS有限元软件创建管-土非线性接触有限元模型,以陕京天然气管道工程为例,考虑采空区的长度和覆土厚度,管道的埋深、内压等因素对结果的影响,开展数值模拟分析采空区管道的应力应变。计算结果表明,管道内压与土壤重力产生的环向应力和沉降作用产生的轴向力是导致地表沉降造成管道失效的主要因素。文中方法适用于在灾害环境下输气管道工程安全性评定,研究成果可提高采空区管道失效分析的准确性。
In order to analyze the stress state of mine area natural gas pipeline, based on ANSYS finite element software, pipe-soil nonlinear contact finite element model was established. Taking Shaanxi-Beijing natural gas pipeline project as an example, considering the influence of the length of mine area, the thickness of the overburden, the buried depth and internal pressure of the pipeline and other factors on results, numerical simulation was carried out to analyze the stress and strain of pipeline in mine area. Calculation results show that the circumferential stress caused by internal pressure and soil gravity and the axial force caused by subsidence are the main factors leading to pipeline failure caused by ground surface subsidence. The method in this paper is suitable for the safety assessment of gas pipeline engineering in disaster environment. The research results can improve the accuracy of pipeline failure analysis in mine area.
作者
郑贤斌
ZHENG Xian-bin(Natural Gas Sales Company,PetroChina,Beijing 100101,China)
出处
《管道技术与设备》
CAS
2022年第4期1-6,共6页
Pipeline Technique and Equipment
基金
中国石油天然气股份有限公司管理创新研究与实践课题(石油企202102、石油企201912)。
关键词
天然气长输管道
采空区
地表沉降
管道失效
natural gas long-distance pipeline
mine area
ground surface subsidence
pipeline failure
