摘要
针对偶然性爆炸对隧道的破坏问题,分析了某重要的软土中隧道在不同装药量和位置内爆炸情况下的动力反应和破坏机理;通过对比研究,分析了围岩等级对隧道抗内爆炸特性的影响;给出了隧道遭受内爆炸情况下围岩受到明显影响的范围。分析结果表明:当比例距离较小时,装药爆炸会对衬砌结构产生十分严重的局部破坏,在装药偏离隧道中心的内爆炸冲击波作用下,隧道结构产生整体运动和变形运动,既可引起结构的局部破坏,也可引起结构的整体变形破坏;围岩级别越高,限制隧道衬砌变形的能力越好,隧道的抗爆特性越好。本文可供隧道抗内爆炸能力评估和抗爆分析设计借鉴。
Dynamic response and failure mechanism of a tunnel in the soft rock and soil subjected to internal explosion of different charge weights and explosion locations are studied,aiming at the issue of tunnel failure subjected to accidentally internal explosion.The influence of the surrounding rock grade on blast-resistant characteristics of the tunnel is analyzed and the severe disturbance range of the surrounding rock induced by internal explosion shock is obtained.The calculation results show that the explosion close to the inner surface of a tunnel can cause seriously local damage for the tunnel.The explosion of charge deviating from the longitudinal center axis of a tunnel can result in both local damage and overall deformation failure of structure and both rigid movement and deformation movement of the tunnel;The higher the surrounding rock grade,the better the capacity to resist deformation of liner structure and the better the blast-resistant characteristics of the tunnel will be.The study of this paper is beneficial to evaluation analysis for blast-resistant characteristics and design of the tunnel.
出处
《地下空间与工程学报》
CSCD
北大核心
2011年第2期385-391,397,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(50778174)
国家科技支撑计划(2006BAJ13B02-03)
关键词
内爆炸
隧道
围岩
动力反应
破坏机理
internal explosion
tunnel
surrounding rock
dynamic response
failure mechanism
