内爆炸作用下公轨合建盾构法隧道非封闭式内衬结构动力响应及抗爆性能分析

发布时间：2018-05-16 16:16

本文选题：盾构法隧道 + 内爆炸　；参考：《振动与冲击》2017年09期

【摘要】：以武汉市三阳路公轨合建越江隧道为工程背景,采用数值仿真手段,对隧道行车层及轨行区不同位置、不同装药量、接触及非接触内爆炸作用下结构加速度、位移动力响应特征及结构塑性区分布、破坏形式进行研究。结果表明:内爆炸作用下,结构加速度及位移响应随爆炸发生迅速增大继而逐渐衰减,其中位移衰减速度较缓慢、衰减程度也较小,起爆点两侧2倍隧道直径范围内衬砌位移响应均较显著;装药量一定时,结构加速度响应的主要影响因素为距起爆点的距离,而结构刚度大小是影响位移响应的主要因素;结构塑性区易出现在起爆点附近、非封闭内衬结构的连接与转角处以及结构刚度较小的部位,其范围大小主要由炸弹装药量决定,管片结构未出现塑性区;结构的破坏形式主要为混凝土板表面爆坑、贯穿、撕裂破碎等。加厚行车道板或在其表面加设抗爆钢板均可显著减小结构塑性区、减轻破坏程度,相比之下加设钢板的措施更具可行性。
[Abstract]:Based on the construction of the cross river tunnel by the public rail of Sanyang Road in Wuhan City, the acceleration of the tunnel structure under the action of different charge quantity, contact and non-contact internal explosion is studied by numerical simulation method in different positions, different charge quantity, contact and non-contact explosion in the driving layer and rail area of the tunnel. The dynamic response of displacement, the distribution of plastic zone and the failure form of the structure are studied. The results show that the acceleration and displacement response of the structure increase rapidly with the explosion and then attenuate gradually under the action of internal explosion, in which the attenuation rate of displacement is slower and the attenuation degree is smaller. The displacement response of the lining in the range of 2 times the diameter of the tunnel on both sides of the initiation point is remarkable, and the main influence factor of the acceleration response of the structure is the distance from the initiation point when the charge quantity is constant, and the stiffness of the structure is the main factor affecting the displacement response. The plastic zone of the structure is easy to appear near the detonation point, the connection and corner of the unenclosed lining structure and the part of the structure stiffness are smaller, its range is mainly determined by the charge quantity of the bomb, and there is no plastic zone in the segment structure. The main failure form of the structure is the concrete slab surface blasting pit, penetrating, tearing and breaking, and so on. Thickening carriageway plate or adding anti-explosion steel plate on its surface can significantly reduce the plastic zone of the structure and reduce the damage degree, compared with the method of adding steel plate is more feasible.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;中铁第四勘察设计院集团有限公司;
【基金】：国家自然科学基金(U1134208;U1361210;51578462) 中央高校基本科研业务费专项资金资助(2682015CX077)
【分类号】：U451.4

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