摘要
为研究水下爆炸条件下断面形式对悬浮隧道结构响应和抗冲击性能的影响,采用LS-DYNA有限元软件建立圆形、椭圆形和长方形3种断面悬浮隧道的数值计算模型,进行动力响应数值模拟分析。对比分析3种断面悬浮隧道在爆炸作用下管体位移、压力及有效应力的响应特性。结果表明:1)圆形断面悬浮隧道受爆炸影响的范围最小,位移、压力和有效应力峰值最低,安全系数最高,抗冲击波性能最优;2)椭圆形和长方形断面管体更易发生局部应力集中,尤其长方形断面的压力和有效应力峰值都高于圆形和椭圆形断面,抗冲击性能较差;3)椭圆形断面悬浮隧道的竖向位移要大于长方形断面,但长方形断面位移变形存在明显畸变。综合分析表明,圆形断面悬浮隧道的抗爆性能优于椭圆形和长方形断面。
To investigate the effect of the cross-sectional shape of a submerged floating tunnel(SFT)on its structural response and impact resistance under underwater explosion conditions,the LS-DYNA finite element software is used to establish numerical models for circular,elliptical,and rectangular SFT cross-sections.This enables the simulation and analysis of their dynamic responses.A comparative analysis is conducted on the three tunnel cross-sections during explosions,focusing on tube displacement,pressure,and effective stress response characteristics.The results are summarized as follows.(1)The circular section of the SFT is impacted by explosions over the smallest range,exhibiting the lowest values for displacement,pressure,and effective stress peaks,along with the highest safety factor and shock wave resistance.(2)The elliptical and rectangular sections show a higher tendency to experience local stress concentrations.In particular,the rectangular section exhibits higher pressure and effective stress peak values than the circular and elliptical sections,indicating poorer impact resistance.(3)The vertical displacement of the elliptical section is larger than that of the rectangular section;meanwhile,the displacement and deformation of the rectangular section are notably distorted.In summary,the comprehensive analysis reveals that the circular SFT section offers better blast resistance than the elliptical and rectangular sections.
作者
罗刚
杨云生
严荔
张宇航
AHMED MD Elias
刘凤玲
LUO Gang;YANG Yunsheng;YAN Li;ZHANG Yuhang;AHMED MD Elias;LIU Fengling(School of Highway,Chang′an University,Xi′an 710064,Shaanxi,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2024年第6期1233-1240,共8页
Tunnel Construction
关键词
悬浮隧道
水下爆炸
断面形式
LS-DYNA有限元软件
结构响应
抗爆性能
submerged floating tunnel
underwater explosion
cross-section form
LS-DYNA finite element software
structural response
explosive resistance performance
