摘要
综合管廊“水气共舱”情况下,若燃气管道泄漏引发爆炸,可能导致同舱给水管道失效破坏。为研究燃气爆炸对同舱管道的影响,采用由非线性有限元程序ANSYS/LS-DYNA定义甲烷-空气混合气体的方法,通过数值模拟研究燃气爆炸作用下同舱管道应变、应力、振动速度及位移变化情况,依据椭圆化失效判定标准,对管道壁厚、内压、弹性模量和屈服强度等4类影响因素进行定量分析。结果表明:燃气爆炸作用下,同舱管道椭圆度与管道壁厚、内压、弹性模量和屈服强度整体均呈现负相关,屈服强度对同舱管道椭圆度影响最小,均低于临界无量纲椭圆度3%;当影响因素变化率由2.5%增加至15%时,管道壁厚与弹性模量对同舱管道椭圆度影响程度较高,管道内压与屈服强度对同舱管道椭圆度影响程度较低。研究结论可为综合管廊“水气共舱”规划设计和相关规范完善提供参考。
In the case of"water and gas sharing"in the integrated pipeline corridor,if the gas pipeline leaks and causes the explosion,it may lead to the failure and damage of the water supply pipeline in the same tank.In order to study the influence of gas explosion on the same cabin pipeline,the method of methane-air mixed gas was defined by the nonlinear finite element program ANSYS/LS-DYNA,and the changes of strain,stress,vibration velocity and displacement of the same cabin pipeline under the action of gas explosion were studied through numerical simulation.According to the criterion of elliptic failure,the four influencing factors of pipe wall thickness,internal pressure,elastic modulus and yield strength were quantitatively analyzed.The results show that,under the action of gas explosion,the ovality of the same tank pipeline is negatively correlated with the wall thickness,internal pressure,elastic modulus and yield strength,and the yield strength has the least influence on the ovality of the same tank pipeline,all of which are lower than 3%of the critical dimensionless ovality.When the change rate of the influencing factors increases from 2.5%to 15%,the influence of wall thickness and elastic modulus on the ovality of the pipeline is higher,while the influence of internal pressure and yield strength on the ovality of the pipeline is lower.The research results can provide reference for the planning and design of the"water-air co-cabin"in the integrated pipeline corridor and the improvement of relevant norms.
作者
曹新阳
米红甫
张昊梁
邵鹏
Cao Xinyang;Mi Hongfu;Zhang Haoliang;Shao Peng(School of Safety Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第3期326-333,共8页
Fire Science and Technology
基金
国家自然科学基金(52274177)。
关键词
综合管廊
水气共舱
燃气爆炸
同舱管道
椭圆度
integrated pipe corridor
integrated water and gas pipeline
gas explosion
cabin piping
ovality
