地下爆炸对埋地输气管道冲击响应的数值分析
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摘要
通过适当选取材料本构关系,运用非线性动力学基本理论和ALE算法,利用LS-DYNA3D有限元程序,对爆炸地冲击作用下引起埋地输气管道的动力响应问题进行了数值模拟分析。通过埋地管道在2组共10个工况下的数值计算分析,拟合了埋地管道响应(包括速度和动应力)最大值和装药量、爆心与管道中心距离之间的关系。模拟计算结果与经验公式规律十分吻合,表明采用数值模拟方法研究爆炸地冲击对埋地管道的作用是可行的。计算方法为埋地管道在第三方破坏荷载作用下的风险评估提供了一个计算平台,计算结果对埋地输气管道的风险评估和防灾减灾具有重要的参考价值。
In this paper,by using non-linear dynamical theory and Arbitrary Lagrange-Eulerian(ALE) algorithm in LS-DYNA 3D finite element program and selecting proper material constitutive relations,a method of numerical simulation is used to study dynamical response of buried gas pipeline under ground shock wave of underground explosion.By numerical calculation and mathematical analysis of buried gas pipeline in 10 load cases of two data groups,the relationship between dynamical maximal responses of buried gas pipeline and the mass of detonator or the distance between the center of pipeline and the detonator including velocity and dynamical stress is fitted respectively.The simulation results agree with the regularity of empirical equation,which shows that it is feasible for the numerical simulation method in this paper to study dynamical response of buried pipelines under ground shock waves from explosion.The method of numerical simulation in this paper provided a calculation platform for the risk evaluation of buried gas pipelines during third-party damage and the conclusion in this paper may provides significant reference for the risk evaluation and disaster prevention of buried gas pipeline.
In this paper,by using non-linear dynamical theory and Arbitrary Lagrange-Eulerian(ALE) algorithm in LS-DYNA 3D finite element program and selecting proper material constitutive relations,a method of numerical simulation is used to study dynamical response of buried gas pipeline under ground shock wave of underground explosion.By numerical calculation and mathematical analysis of buried gas pipeline in 10 load cases of two data groups,the relationship between dynamical maximal responses of buried gas pipeline and the mass of detonator or the distance between the center of pipeline and the detonator including velocity and dynamical stress is fitted respectively.The simulation results agree with the regularity of empirical equation,which shows that it is feasible for the numerical simulation method in this paper to study dynamical response of buried pipelines under ground shock waves from explosion.The method of numerical simulation in this paper provided a calculation platform for the risk evaluation of buried gas pipelines during third-party damage and the conclusion in this paper may provides significant reference for the risk evaluation and disaster prevention of buried gas pipeline.
引文
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[2]吕宏庆,李均峰.管道第三方破坏的原因及预防措施[J].天然气工业,2005,25(12):118-120.
[3]王礼立.爆炸力学数值模拟中本构建模问题的讨论[J].爆炸与冲击,2003,23(2):97-104.
[4]何长江,志鲁,其京.高速碰撞的三维欧拉数值模拟方法[J].爆炸与冲击,1999,19(3):216-221.
[5]王肖钧,秀章,永池.高速碰撞中的有限元方法及其应用[J].爆炸与冲击,1993,13(4):296-304.
[6]王跃先,陈军,阮雪榆.ALE有限元方法中的网格运动算法[J].上海交通大学学报,2001,35(10):1539-1542.
[7]张雄,陆明万,王建军.任意拉格朗日-欧拉描述法研究进展[J].计算力学学报,1997,14(1):91-102.
[8]张奇,若京.ALE方法在爆炸数值模拟中的应用[J].力学季刊,2005,26(4):639-642.
[9]王飞,王连来,刘广初.爆炸荷载对天然气管道(空管)的破坏作用研究[J].爆破,2006,23(4):20-24.
[10]都的箭,邓正栋,张平,等.土中爆炸地冲击作用下埋地管线动应力的数值模拟[J].爆破,2005,22(1):20-24.
[11]都的箭,刘志杰,马书广.埋地管线在爆炸地冲击作用下的数值模拟[J].地下空间与工程学报,2007,3(1):108-186.
[12]许三罗.爆炸荷载作用下砌体结构响应的有限元分析[J].防灾减灾工程学报,2007,27(3):357-362.
[13]廖维张,杜修力,田志敏.爆炸荷载作用下部分埋置结构响应的数值模拟方法[J].北京工业大学学报,2007,33(2):155-159.
[14]杨政,郭万林,董惠茹,等.X70管线钢静态和动态韧性试验研究[J].西安交通大学学报,2003,37(5):488-491.
[15]贾普荣,李年,朱维斗.反向加载时X70钢的力学性能[J].机械强度,2005,27(1):82-84.
[16]夏昌敬,鞠杨,谢和平.爆炸载荷下岩石损伤与能量耗散的数值分析[J].弹道学报,2006,18(3):1-4.
[17]胡春红,周晶.炸药量和场地条件对水下爆炸地震波影响的数值模拟[J].爆破,2007,24(3):11-15.
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