摘要
为探究不同压力条件下高压燃气管道泄漏爆炸对下伏地铁车站顶板破坏的影响,采用TNT当量法确定高压燃气管道泄漏后的燃气云爆炸荷载,通过ANSYS/LS-DYNA建立全尺寸地铁车站顶板数值仿真分析模型,从结构损伤、破坏形态、Von-Mises应力、动态响应4个方面综合分析爆炸荷载下地铁车站顶板的破坏情况,并基于量纲分析法提出高压燃气管道泄漏爆炸时地铁车站顶板破坏效应与高压燃气管道压力之间的函数关系表达式。研究结果表明:地铁车站顶板主要表现为震塌破坏,破坏区的宽度与管道压力呈正比;梁板交接处极易出现局部撕裂破坏,产生2条沿梁方向的贯穿裂缝;Von-Mises应力主要集中在破坏区的边缘处,应力值与管道压力呈反比,迎爆面与背爆面的Von-Mises应力峰值相等,扩散规律不同;地铁车站顶板的Z向节点位移、速度响应与管道压力呈正比,迎爆面与背爆面的Z向节点加速度响应规律相反。
To investigate the damage effects of high-pressure gas pipeline leakage and explosion on the roof structure of underlying subway stations under different pressure conditions,this study employs the TNT equivalent method to determine the gas cloud explosion load following pipeline leakage.A full-scale numerical simulation model of subway station roof is established using ANSYS/LS-DYNA,comprehensively analyzing the damage characteristics from four aspects:structural damage,failure modes,Von-Mises stress,and dynamic response.A dimensional analysis-based functional relationship expression is proposed between roof damage effects and pipeline pressure.Key findings include:(1)The subway station roof primarily exhibits spalling failure,with damage zone width proportional to pipeline pressure;(2)Local tearing failures frequently occur at beam-slab joints,generating two through cracks along beam direction;(3)Von-Mises stress concentrates at damage zone edges with values inversely proportional to pipeline pressure,showing equal peak stress but different distribution patterns on the blast-facing side and the back-blast side;(4)Nodal displacement and velocity responses in the Z-direction are proportional to pipeline pressure,while the acceleration response patterns in the Z-direction on the blast-facing side and the back-blast side exhibit opposite trends.
作者
程建华
翁应康
叶亚齐
杨小林
严文荣
郭瑞静
CHENG Jianhua;WENG Yingkang;YE Yaqi;YANG Xiaolin;YAN Wenrong;GUO Ruijing(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003;International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention,Jiaozuo 454003;Zhengzhou Metro Group Co.,Ltd.,Zhengzhou 450013)
出处
《现代隧道技术》
北大核心
2025年第3期151-159,169,共10页
Modern Tunnelling Technology
基金
国家自然科学基金联合基金重点项目(U23A20600)
河南省科技攻关项目(242102320049)
河南理工大学基本科研业务费专项项目(NSFRF240626)
企业委托重大科研项目(H22-541).
关键词
高压燃气管道
泄漏爆炸
地铁车站顶板
破坏效应
High-pressure gas pipeline
Leakage explosion
Subway station roof
Damage effect
作者简介
程建华(1976-),男,硕士,副教授,主要从事爆炸荷载作用下结构毁伤效应方面的研究与教学工作,E-mail:cheng15@hpu.edu.cn;通讯作者:杨小林(1963-),男,博士,教授,博士生导师,主要从事隧道与地下工程方面的工作,E-mail:yangxl@hpu.edu.cn.
