基于生死单元技术的河流穿越管道力学规律研究

Study on the mechanical laws of river crossing pipeline based on life and death units technology

摘要

为了研究河流穿越管道从埋地到上方覆土逐渐减少以致管道完全悬空这一过程的力学特性，本研究采用ABAQUS有限元软件，基于生死单元技术建立X80输气管道上方覆土逐渐减少以致管道悬空长度不断增加的动态有限元模型；分析洪水流速、下切角度、径厚比、运行内压和埋深对河流穿越管道力学行为的影响规律；通过敏感性分析获取各影响因素对河流穿越管道应力的影响程度并排序。研究结果表明:不同参数下的管道最大等效应力、位移和应变在悬空20～30 m期间增长最快；洪水流速、管径和运行内压与最大等效应力呈正相关，管道壁厚与最大等效应力呈负相关，下切角度在悬空过程中与最大等效应力呈正相关，在悬空到一定长度时，下切角度和埋深对最大等效应力影响不大，但下切角度与位移呈正相关，埋深与位移成负相关；各影响因素对河流穿越管道最大等效应力的影响程度排序为管道壁厚＞洪水流速＞运行内压＞埋深＞下切角度，以期为管道规划、设计要求提供依据并改进，以提高其安全性。

Abstract

In order to study the mechanical properties of the process of the river crossing pipeline from the buried to the overlying soil gradually reduced so that the pipeline is completely suspended, this paper uses ABAQUS finite element software to establish a dynamic finite element model based on the life and death units technology for an X80 gas pipeline, where the length of pipeline suspension gradually increases as the overlying soil decreases. The paper analyzes the effects of flood flow velocity, undercut angle, diameter-thickness ratio, operating internal pressure, and burial depth on the mechanical behavior of river crossing pipelines. Sensitivity analysis is used to obtain the degree of influence of each factor on the stress of the river crossing pipeline and rank them accordingly. The results show that the maximum equivalent stress, displacement, and strain of the pipeline under different parameters increase the fastest during the 20-30 m suspension period. The maximum equivalent stress is positively correlated with flood flow velocity, diameter, and operating internal pressure, while it is negatively correlated with the wall thickness of the pipeline. The undercut angle is positively correlated with the maximum equivalent stress during the suspension process. When the suspension length reaches a certain value, the undercut angle and burial depth have little effect on the maximum equivalent stress. However, the undercut angle is positively correlated with displacement, while the burial depth is negatively correlated with displacement. The degree of influence of each factor on the maximum equivalent stress of the river crossing pipeline is ranked as follows: wall thickness＞flood flow velocity＞operating internal pressure＞burial depth＞undercut angle. These findings can provide basis for pipeline planning and design requirements and improve its safety.

关键词

悬空管道 / 悬空长度 / 力学规律 / 敏感性分析 / 数值模拟

Key words

suspension pipeline / suspended length / mechanics principles / sensitivity analysis / numerical simulation

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基金资助

四川省科技计划资助项目(2019YFS0075)

四川省科技计划资助项目(2020YJ0153)