爆破冲击荷载下隧道振动特性与安全性评价研究

隧道工程爆破施工引起衬砌结构以及地表建筑物破坏时有发生,研究隧道工程爆破振动效应以及安全性评价方法,对确保隧道工程施工安全十分重要。基于三维动力有限元分析方法,以某城市双连拱隧道工程爆破施工为例,探讨爆炸冲击荷载作用下隧道围岩介质动力响应特征。研究表明,爆破冲击对周围介质的影响具有时间滞后和累积损伤效应,只考虑爆破瞬时最大振动波速对围岩介质以及地表建筑物的影响不能真实反映爆破影响的实质。同时结合具体工程对地表建筑物爆破安全评价方法进行分析研究,建议将现代数值分析方法应用于复杂条件下隧道爆破安全性评价工作。

Study on Vibration Property of Tunnel under Blasting Load and Its Safety Assessment

The damage to tunnel's lining and ground buildings caused by blast work frequently occurs,so studying the vibration effect of tunnel engineering blasting and its safety assessment method is very important to the construction safety of tunnel engineering.Based on the 3D dynamic finite element method,and with the blasting construction for a double-arc tunnel as an example,the dynamic response properties of the surrounding rock under the blasting loads were investigated deeply.The results show that the impact of blasting vibration on tunnel's surrounding rock has the characteristics of time-lagging effect and accumulative effect of damage.Only considering the impact of the biggest instantaneous wave celerity of the blast on the surrounding rock and ground buildings can not reflect the influence essence of the blasting.In the end,safety assessment method for ground building blasting was discussed through combining specific engineering.And a suggestion of applying modern numerical analysis in the safety evaluation of tunnel blasting under complex conditions was given.