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占压作用下管道力学特性分析及管控措施研究
Analysis of mechanical properties of pipelines under external load and research on control measures
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- DOI:
- 作者:
- 刘海鹏，商卫星，孙陌球，李小刚，王婷婷，梁昌晶
- 作者单位:
- 1.中国石油华北油田公司二连分公司，内蒙古锡林浩特 062000 2.中国石油华北油田公司经济技术研究院，河北任丘 062552 3.中国石油华北油田公司第五采油厂，河北辛集 052360
- 关键词:
- 管道占压；有限元分析；疲劳寿命；应力强度；管控措施
external load on pipeline; finite element analysis; fatigue life; stress intensity; control measures
- 摘要:
- 针对建筑物堆载及车辆碾压导致的管道占压问题，以材质为20号钢的集输管道为研究对象，建立了
考虑管-土非线性耦合的三维有限元模型，分析了均布静载荷和循环动载荷作用下的管道力学特性，给出了不
同工况下的管控措施。结果表明，静载荷下管道内压是影响管壁等效应力的主要因素，当占压区宽度与管道外
径接近时，等效应力的增幅明显下降；在内压为5 MPa时，管道全区域安全占压重量降至5 t以下，无有效安
全占压空间；对于循环动载荷而言，普通货车以空载低速通行时，管道寿命为9.9 a，重型卡车以满载高速通
行时，管道寿命降至0.5 a；需根据管道运行内压严格限制占压重量与布设位置，同时严禁重载车辆通行并管
控允许车辆低速限行。研究结果可为占压区管道的安全平稳运行提供实际依据。
To address the external load on pipelines caused by building loading and vehicle rolling, a three-dimensional finite element model considering the nonlinear pipe-soil coupling was established for the gathering pipeline made of No. 20 steel. The mechanical properties of the pipeline under uniform static load and cyclic dynamic load were analyzed, and control measures under different conditions were provided. The results show that for static loads, the internal pressure of the pipeline has the greatest influence on the equivalent stress. When the difference between the width of the external load area and the outer diameter of the pipeline is small, the increase of the equivalent stress decreases. When the internal pressure is 5 MPa, the safe external load weight pipeline in all areas is less than 5 t with no safe stacking space. For cyclic dynamic loads, when an ordinary truck passes unloaded at a low speed, the pipeline life is only 9.9 years, and when a heavy-duty truck passes fully loaded at a high speed, the life drops to 0.5 years. The external load weight and position should be strictly limited according to the internal pressure. At the same time, heavy-duty vehicles are strictly prohibited from passing, and low-speed restrictions should be imposed on allowed vehicles. The research results provide a practical basis for the safe and stable operation of pipelines in the external load area.