洛带古镇隧道衬砌结构在冲击荷载作用下的受损机理研究

发布时间：2018-07-05 04:54

本文选题：瓦斯爆炸 + 爆炸荷载　；参考：《公路》2017年04期

【摘要】：随着我国高速公路网的逐渐完善,山岭隧道建造的数量越来越多,修建隧道中遇到的不良地质情况也越来越复杂,尤其是隧道穿越地层富含瓦斯时,给隧道的修建工作带来了挑战。以成都洛带古镇隧道为工程案例,采用显示动力学分析软件AUTODYN在考虑衬砌结构和空气的流固耦合作用下建立数值模型,对隧道衬砌结构在由瓦斯爆炸产生的冲击荷载作用下的速度和位移响应及衬砌结构受损破坏过程进行了计算分析,数值模型中以TNT模拟瓦斯。计算结果表明,在不同TNT当量作用下,超压峰值以爆心在仰拱地面上的投影点为中心向四周衰减;超压峰值和炸药量成正比,爆炸冲击波在衬砌结构的纵向和径向运动过程不尽相同,衬砌各部位的受损程度也不尽相同,最终是局部破坏导致衬砌结构的整体破坏,使得衬砌结构失去支护承载能力。
[Abstract]:With the gradual improvement of highway network in China, more and more mountain tunnels are being built, and the bad geological conditions encountered in the construction of tunnels are becoming more and more complicated, especially when the tunnel passes through the strata rich in gas. It poses a challenge to the construction of the tunnel. Taking Luodai Guzhen Tunnel in Chengdu as an engineering case, a numerical model was established by using display dynamics analysis software AUTODYN, considering the fluid-solid coupling of lining structure and air. The velocity and displacement response of tunnel lining structure under the impact load caused by gas explosion and the damage and failure process of lining structure are calculated and analyzed. TNT is used to simulate gas in the numerical model. The calculated results show that under different TNT equivalent, the peak value of overpressure attenuates around the projecting point of the center of the explosive center on the inverted arch, and the peak value of overpressure is proportional to the quantity of explosive. The process of longitudinal and radial movement of blast wave in lining structure is different, and the damage degree of each part of lining is also different. Finally, the local failure leads to the overall destruction of lining structure, which makes the lining structure lose its supporting capacity.
【作者单位】：中电建路桥集团有限公司;北京科技大学土木与资源工程学院;
【分类号】：U451.4

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