Lu Ye, Ding Yuqi, Zhang Jiahe, Yang Ming
College of Mechanical Science and Engineering, Northeast Petroleum University, Heilongjiang, Daqing, 163318, China.
Heliyon. 2023 Jul 22;9(8):e18549. doi: 10.1016/j.heliyon.2023.e18549. eCollection 2023 Aug.
When the buried pipeline is subjected to the external explosion load, stress and deformation will occur. When the stress and deformation value exceed a specific range, it will affect the normal use of the buried pipeline. In this paper, a multiphase coupled model of pipeline, soil and fluid within the pipeline is established. The penalty function coupling method is used to describe the load between soil and pipeline and the fluid within the pipeline. By specifying the boundary conditions of the coupled system, the multiphase coupled global solution variational principle function of the soil-pipe-fluid is derived. According to the established multiphase coupled calculation method, the numerical simulation analysis of the response of pipeline to external explosion is carried out. The maximum error of the experimental and numerical simulation results is about 5%, which verifies the accuracy of the multiphase coupled calculation method. The soil-pipeline-fluid multiphase coupled numerical calculation model is established to analyze the response of the buried pipeline under the external explosion load. The results show that during the explosion shock wave propagating in the soil, the peak value of the explosion pressure in different positions in the soil of the gas pipeline is greater than that of the oil pipeline. As for the structural response, the maximum radial displacement value of the oil pipeline is reduced by 3.83 mm compared with the gas pipeline, the maximum stress value is reduced by 3.75%. The maximum radial displacement value of the pipeline with a fluid velocity of 1.5 m/s is 2.65 mm larger than that of the pipeline with a fluid velocity of 1 m/s, and the maximum stress value is increased by 5.72%. The deformation resistance and explosion resistance of the oil pipeline are both stronger than that of the gas pipeline. The higher the fluid velocity, the weaker the pipeline's resistance to deformation and explosion will be.
当埋地管道受到外部爆炸载荷作用时，会产生应力和变形。当应力和变形值超过特定范围时，会影响埋地管道的正常使用。本文建立了管道、土壤及管内流体的多相耦合模型，采用罚函数耦合方法描述土壤与管道以及管内流体之间的载荷。通过指定耦合系统的边界条件，推导出土 - 管 - 流体多相耦合全局解变分原理函数。根据所建立的多相耦合计算方法，对管道在外部爆炸作用下的响应进行了数值模拟分析。实验结果与数值模拟结果的最大误差约为5%，验证了多相耦合计算方法的准确性。建立了土 - 管道 - 流体多相耦合数值计算模型，分析埋地管道在外部爆炸载荷作用下的响应。结果表明，在爆炸冲击波在土壤中传播过程中，燃气管道土壤中不同位置的爆炸压力峰值大于输油管道。在结构响应方面，输油管道的最大径向位移值比燃气管道减小了3.83mm，最大应力值减小了3.75%。流体速度为1.5m/s的管道最大径向位移值比流体速度为1m/s的管道大2.65mm，最大应力值增加了5.72%。输油管道的抗变形能力和抗爆炸能力均强于燃气管道。流体速度越高，管道的抗变形和抗爆炸能力越弱。
