摘要
借助LS-DYNA软件建立某隧道一号斜井爆破开挖模型,用现场实测振动数据验证模拟结果的可靠性,并分析研究了爆破开挖下围岩的动力响应.研究结果表明:隧道爆破开挖时,合速度峰值与Y方向振速峰值最大值均出现在拱顶;在爆源附近,X方向与Z方向振速峰值与加速度峰值均在边墙中部有最大值,且随着爆心距的增大,最大值出现在拱顶;边墙有效应力在拱脚以及拱顶有较大值.因此隧道爆破开挖时,应加强边墙中部以及拱顶的稳定性.
In this paper,the author established a blasting excavation model for the No.1 inclined shaft of a tunnel by using LS-DYNA software,and proved the reliability of the simulation results based on the in-situ monitoring of blasting vibration.Through analyzing dynamic response of the inclined shaft subjected to blast excavation loading,it could be concluded that the maximum peak values of vibration velocity occured in vault in vector synthesis direction and the Y direction.However,both the maximum peak values of vibration velocity and acceleration occurred in the side wall central section in the X direction and the Z direction,and then reached the maximum in vault changing with the increase of detonating distance.The simulation results also showed that effective stress was bigger in foot and vault than in the other section of tunnel side wall.Therefore,the stability of the central of side wall and the vault should be strengthened during tunnel blasting excavation.
作者
刘改英
Liu Gaiying(China Railway 16th Bureau Group 3nd Engineening Co.Ltd.,Huzhou Zhejiang 313000,China)
出处
《铁道建筑技术》
2019年第S01期163-167,共5页
Railway Construction Technology
关键词
动力响应
振动速度
加速度
数值模拟
dynamic response
vibration velocity
acceleration
numerical simulation
作者简介
刘改英(1984一),男,浙江湖州人,工程师,主要从事隧道施工管理方面的工作,E-mail:315138399@qq.com
