摘要
为系统地评估城市地下浅埋管沟可燃气体爆炸的灾害后果,利用FLACS软件模拟得到了可燃气体的爆炸荷载,并分析了该灾害对建筑物破坏和人员伤害的危险距离及影响因素。结果表明:当点火位置靠近管沟中间位置时,超压峰值和危险距离较大;泄爆口的大小对危险距离的影响不大,而对离泄爆口较近处的超压峰值影响较大;气云长度越长,超压峰值和危险距离也越大,但增幅逐渐减小直至不变;管沟的横截面面积越大,超压峰值和危险距离也越大;为避免造成严重的灾害后果,高耸建筑物和密集人群应远离泄爆口。
Gas explosion accidents occurring in urban shallowly-buried pipe trenches can cause enormous casualties and property damage through shock waves transmitting from explosion vents,while many influencing factors exist in the process of gas explosion.In order to evaluate the disaster consequences of combustible gas explosion in an urban shallow-buried pipe trench systematically,the different conditions were established including different ignition points,different vent sizes,different gas cloud lengths and different trench cross-sectional areas.The computational fluid dynamics software FLACS was used to perform numerical simulation.And the explosion load of the combustible gas was obtained in the X,Y,and Z directions.The characteristics of the explosion overpressure peak distribution were analyzed,and the load generation mechanism was illustrated by analyzing the explosion process.The overpressure criteria were selected to demarcate the dangerous distances and the critical distances for damage to buildings and humans were determined.The mild,moderate,severe dangerous distances for building damage and personal injury were recorded and the influences of different factors on the change of the dangerous distances were analyzed.The results show that when the ignition position is closer to the middle of the pipe trench,the overpressure peak is greater and the dangerous distance is larger.The change of the vent sizes has a little effect on the fluctuation range of the dangerous distance,but has a great effect on the overpressure peak near the vent.The longer the gas cloud length,the greater the overpressure peak and the larger the dangerous distance,but the increase decreases gradually until it remains unchanged.The larger the cross-sectional area of the pipe trench,the greater the overpressure peak and the larger the dangerous distance.When the cross-sectional area of the pipe trench increases,the gas cloud volume participating in the combustion reaction in the pipe trench also increases,which intensifies the reaction degree of the gas explosion.In order to avoid serious disaster consequences,high-rise buildings and dense crowd should be far away from the explosion vent.
作者
杨石刚
蔡炯炜
杨亚
孙文盛
门敬敏
YANG Shigang;CAI Jiongwei;YANG Ya;SUN Wensheng;MEN Jingmin(State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,Army Engineering University of PLA,Nanjing 210007,Jiangsu,China;73021 Troop of PLA,Hangzhou 310012,Zhejiang,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2023年第1期155-166,共12页
Explosion and Shock Waves
基金
国家重点研发计划(2020YFB2103300)
江苏省自然科学基金优秀青年基金(BK20180081)。
关键词
城市地下浅埋管沟
可燃气体
爆炸冲击波
危险距离
超压峰值
气云长度
后果评估
urban shallow-buried pipe trench
gas explosion
explosion load
dangerous distance
overpressure peak
gas cloud length
consequence assessment
