摘要
为研究爆破震动对巷道稳定性影响,运用有限元法建立爆破加载模型,采用ANSYS软件就瞬态动力大小、作用时间和作用范围对巷道围岩应力场及表面位移的影响,对巷道稳定性进行分析。结果表明,单段药量越大、作用时间越长、采区越接近监测巷道时,巷道岩体位移越大;在爆破震动作用下,巷道侧帮产生压应力集中,易发生破坏,巷道顶板出现拉应力作用,易引起拉伸破坏;爆破震动对工程在Y方向的影响远远大于在X方向的影响。
In order to study the influence of blasting vibration on tunnel stability,a blasting model is established by the finite element method.The effect of the dynamic force,reaction time and span on the stress field of tunnel wall-rocks and the surface displacement is analyzed by ANSYS software.The result shows that the displacement of tunnel is larger as the weight of explosive becomes larger,the reaction time is longer,and the distance is nearer to the tunnel.Under the blasting vibration,the side wall of tunnel can easily lead to collapse because of the concentrated stress.The influence of blasting on Y-direction is much larger than that on X-direction.
出处
《金属矿山》
CAS
北大核心
2010年第1期28-30,50,共4页
Metal Mine
关键词
爆破震动
有限元法
应力
位移
Blasting vibration Finite element method Stress Displacement
