基于SPH-FEM耦合算法的埋地输气管道近场爆炸冲击动力响应

doi:10.7623/syxb201711012

石油学报 ›› 2017, Vol. 38 ›› Issue (11): 1326-1334.DOI: 10.7623/syxb201711012

基于SPH-FEM耦合算法的埋地输气管道近场爆炸冲击动力响应

梁博¹, 蒋宏业¹, 徐涛龙¹, 姚安林^1,2, 文霞¹

1. 西南石油大学石油与天然气工程学院四川成都 610500;
2. 油气消防四川省重点实验室四川成都 610500

收稿日期:2017-04-11 修回日期:2017-09-25 出版日期:2017-11-25 发布日期:2017-12-08
通讯作者: 徐涛龙,男,1984年9月生,2007年获西南石油大学学士学位,2014年获四川大学固体力学专业博士学位,现为西南石油大学石油与天然气工程学院讲师,主要从事管线力学及油气管道完整性管理相关科研和教学工作。Email:swpuxtl@163.com
作者简介:梁博,男,1992年10月生,2015年获西南石油大学学士学位,现为西南石油大学硕士研究生,主要从事管线力学及管道风险评价研究。Email:isliangbo@foxmail.com
基金资助:
油气消防四川省重点实验室开放基金项目（YQXF201601）资助。

Impact dynamic response of near-field explosion in buried gas pipeline based on SPH-FEM coupling algorithm

Liang Bo¹, Jang Hongye¹, Xu Taolong¹, Yao Anlin^1,2, Wen Xia¹

1. College of Petroleum & Natural Gas Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Key Laboratory of Oil and Gas Fire Control of Sichuan Province, Sichuan Chengdu 610500, China

Received:2017-04-11 Revised:2017-09-25 Online:2017-11-25 Published:2017-12-08

摘要/Abstract

摘要：

利用ANSYS/LS-DYNA和LS-PREPOST前后处理模块，建立基于光滑粒子流体力学-有限单元法（SPH-FEM）耦合的土中爆炸模型。结果表明，土中爆炸波峰值压力随比例爆距的衰减规律与经验曲线基本一致，且瞬时爆腔尺寸也和相关经验描述吻合较好，从而验证了方法的可行性与准确性。针对X80大口径高压输气管线在土中近场爆炸的冲击响应过程，建立管-土-炸药耦合模型，分析起爆后不同时刻爆腔形状的演变过程（从球状到椭球状），得到不同时刻管体扰动（变形与受力）与土壤介质压缩形态的内在联系，详细描述管体迎爆面、背爆面测点的位移及应力特征，并反映最大冲击应力的截面分布情况及其在不同时刻的出现位置，最后，基于应变极限判断受冲击管道的失效情况。研究采用的耦合算法可为管道防爆研究提供新思路，对爆炸灾害下管体及周边结构的风险评估提供基于模拟分析的定量依据。

关键词: SPH-FEM耦合算法, 输气管道, 土中爆炸, 动力学响应, 数值模拟

Abstract:

Pre-post processing modules of ANSYS/LS-DYNA and LS-PREPOST were used to establish the in-soil explosion model based on the coupling between smoothed particle hydrodynamics and finite element method (SPH-FEM). The results show that the attenuation law of in-soil explosion peak pressure with proportional blasting distance is basically consistent with the empirical curve, and the instantaneous blasting cavity size also accords well with relevant empirical description, so as to prove the feasibility and veracity of this method. Aiming at the impact response process of in-soil near-field explosion in X80 large-diameter high-pressure gas transmission pipeline, the pipe-soil-explosive coupling model was established to analyze the evolution processes of blasting cavity shape (from globular to axiolitic)at different moments posterior to explosion. As a result, the inner relations between pipeline body disturbance (deformation and stress)and soil medium compression form at different moments were obtained to detailedly describe the displacement and stress characteristics of measuring points on the front-back blasting surfaces of pipeline body as well as reflect the section distribution and location of maximum impact stress at different moments. Finally, the failure conditions of impacted pipeline were estimated based on strain limit. The coupling algorithm was used in this study for applying new ideas to pipeline anti-explosion research, which also provided the quantitate basis based on simulation analysis for the risk evaluation of pipeline body and surrounding structures under explosion disaster.

Key words: SPH-FEM coupling algorithm, gas pipeline, in-soil explosion, dynamic response, numerical simulation

中图分类号:

TE881

梁博, 蒋宏业, 徐涛龙, 姚安林, 文霞. 基于SPH-FEM耦合算法的埋地输气管道近场爆炸冲击动力响应[J]. 石油学报, 2017, 38(11): 1326-1334.

Liang Bo, Jang Hongye, Xu Taolong, Yao Anlin, Wen Xia. Impact dynamic response of near-field explosion in buried gas pipeline based on SPH-FEM coupling algorithm[J]. Acta Petrolei Sinica, 2017, 38(11): 1326-1334.

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基于SPH-FEM耦合算法的埋地输气管道近场爆炸冲击动力响应

Impact dynamic response of near-field explosion in buried gas pipeline based on SPH-FEM coupling algorithm

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