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落石冲击引起的管道变形数值模拟

Numerical simulation of pipeline deformation caused by rockfall impact.

作者信息

Zhang Jie, Liang Zheng, Han Chuanjun

机构信息

School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China.

出版信息

ScientificWorldJournal. 2014;2014:161898. doi: 10.1155/2014/161898. Epub 2014 May 13.

DOI:10.1155/2014/161898
PMID:24959599
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4053267/
Abstract

Rockfall impact is one of the fatal hazards in pipeline transportation of oil and gas. The deformation of oil and gas pipeline caused by rockfall impact was investigated using the finite element method in this paper. Pipeline deformations under radial impact, longitudinal inclined impact, transverse inclined impact, and lateral eccentric impact of spherical and cube rockfalls were discussed, respectively. The effects of impact angle and eccentricity on the plastic strain of pipeline were analyzed. The results show that the crater depth on pipeline caused by spherical rockfall impact is deeper than by cube rockfall impact with the same volume. In the inclined impact condition, the maximum plastic strain of crater caused by spherical rockfall impact appears when incidence angle α is 45°. The pipeline is prone to rupture under the cube rockfall impact when α is small. The plastic strain distribution of impact crater is more uneven with the increasing of impact angle. In the eccentric impact condition, plastic strain zone of pipeline decreases with the increasing of eccentricity k.

摘要

落石冲击是油气管道运输中的致命危害之一。本文采用有限元方法研究了落石冲击引起的油气管道变形。分别讨论了球形和立方体落石的径向冲击、纵向斜向冲击、横向斜向冲击和侧向偏心冲击作用下管道的变形情况。分析了冲击角度和偏心距对管道塑性应变的影响。结果表明，相同体积的球形落石冲击管道产生的坑深比立方体落石冲击的更深。在斜向冲击条件下，球形落石冲击产生坑的最大塑性应变出现在入射角α为45°时。当α较小时，立方体落石冲击下管道易发生破裂。随着冲击角度的增大，冲击坑的塑性应变分布更不均匀。在偏心冲击条件下，管道的塑性应变区随着偏心距k的增大而减小。

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