以甬舟铁路金塘海底隧道为研究背景,采用ANSYS/LS-DYNA建立基于偏心爆炸作用下衬砌结构动力响应的有限元模型,分析管片衬砌、二次衬砌以及行车道板等结构的应力和位移响应.结果表明,40 kg TNT炸弹偏心爆炸主要影响局部构件的使用安全,其主要应对措施是及时开展隧道衬砌及内部结构的局部修复;距离起爆断面14 m,40 kg TNT炸弹偏心爆炸引起的结构位移较小;衬砌节点位移在极短时间内迅速增至最大值,随后以接近正弦脉冲的变化规律逐渐递减,随着纵向距离增加位移峰值出现的时间逐渐向后推移.
Dynamic Response of a Shielded Tunnel Structure under Eccentric Blast Loads
This paper presents a case history of Jintang Subsea Tunnel of Yongzhou Railway.The commercial software AN-SYS/LS-DYNA is used to establish the finite element model by using the dynamic response of the lining structure under the ec-centric explosion.The stress and displacement response of the segment lining,secondary lining and lane plate are also evalua-ted.The results show that the eccentric explosion of a 40kg TNT bomb mainly affects the safety of the local components,and the main countermeasures are to perform the local repair of the tunnel lining and the internal structure in time.The structure displacement caused by the eccentric explosion of a 40kg TNT bomb 14m away from the initiation section is small.The dis-placement of the lining nodes rapidly increases to the maximum value in a very short time,and then gradually decreases with a variation pattern close to the sinusoidal pulse,and the time of the peak displacement gradually moves backward with the in-crease of longitudinal distance.
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