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  

Dynamic response and anti-explosion behavior analysis for combined railway and roadway shield tunnel's unclosed inner lining structure under internal explosion

作　　者：张景[1] 封坤[1] 何川[1] 肖明清[2] 王维[1] 何应道[2] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《振动与冲击》2017年第9期231-238,266,共9页Journal of Vibration and Shock

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)

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。Taking the Sanyang Road-cum-Urban Rail tunnel as the engineering background, the numerical simulation method was employed to analyze dynamic responses of acceleration and displacement of the tunnel structure, the distribution of the structural plastic region, and destruction forms under the internal explosion action with different kinds of explosive charge located in different positions. The results showed that the dynamic responses of acceleration and displacement of the structure increase rapidly and then decay gradually along with the explosion; the explosion has a deeper influence on displacements, its single side influence range is larger than 2 times of the tunnel diameter; under a certain explosive charge acceleration responses are mainly influenced by the distance to the initiation explosion point, and the stiffness of the structure is the main influence factor of displacement responses; the plastic region of the structure is dependent on explosive charge, it appears near the initiation explosion point, corners and low-stiffness components of the inner liner and does not appear in the segmental liner under the action of internal explosion; the destruction forms of the structure are mainly divided into blasting craters of surface, and penetration or tearing of concrete slabs; thickened roadway slabs or their additional anti-explosion steel plates reduce plastic regions more significantly. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

关 键 词：盾构法隧道 内爆炸 公轨合建断面 动力响应 抗爆性能 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]