傍山隧洞爆破开挖的坡面振动特性分析

发布时间：2018-06-20 14:41

本文选题：隧洞 + 爆破振动　；参考：《中国科技论文》2017年19期

【摘要】：为研究傍山隧洞爆破开挖对邻近边坡的振动影响,采用有限元数值模拟手段,建立了简化"隧洞-边坡"模型,分析了爆破过程应力波的传播规律及位移的变化规律,查明了边坡表面不同位置处的质点振速峰值的分布规律,通过反映高程效应的爆破振动公式,分析了边坡在水平方向和垂直方向的高程放大效应,并对不同影响因素下边坡的振动效应进行了敏感性分析。结果表明:随着围岩级别的降低,坡面最大振速峰值逐渐增大;随着隧洞断面尺寸的增加,坡面最大振速峰值逐渐增大;隧洞位置对坡面振速峰值有所影响,综合考虑水平和竖直方向的距离与振速拟合比仅采用爆心直线距离与振速拟合效果要好。
[Abstract]:In order to study the influence of blasting excavation on the vibration of adjacent slopes, a simplified "tunnel slope" model is established by means of finite element numerical simulation, and the propagation law of stress wave and the variation law of displacement during blasting are analyzed. The distribution law of the peak value of particle vibration velocity at different positions on the slope surface is found out. Through the blasting vibration formula reflecting the height effect, the elevation amplification effect in the horizontal and vertical direction of the slope is analyzed. And the sensitivity analysis of the slope vibration effect under different influence factors is carried out. The results show that with the decrease of surrounding rock level, the peak value of maximum vibration velocity increases gradually, the peak value of maximum velocity increases with the increase of tunnel section size, and the location of tunnel affects the peak value of vibration velocity of slope surface. Considering the horizontal and vertical direction, the fitting effect of the distance and the vibration velocity is better than that of using the blasting center straight line distance and the vibration velocity.
【作者单位】：重庆交通大学重庆市高校水工建筑物健康诊断技术与设备工程研究中心;重庆交通大学水利水运工程教育部重点实验室;莫斯科大学工程地质教研室;
【基金】：重庆市研究生教育创新基金资助项目(CYB17126) 重庆市基础科学与前沿技术研究一般项目(cstc2017jcyjA1642) 重庆市教委科学技术研究项目(KJ1705123) “十二五”国家科技支撑计划项目(2015BAK09B01)
【分类号】：TU435;U455.6

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