摘要
台阶状地形爆破振动的放大与衰减效应是影响边坡及周围构筑物稳定性的重要因素。利用数值程序建立边坡模型,对其地形效应的产生及变化规律进行研究。试验结果表明:台阶状地形岩体表面质点振动速度分布存在明显的非线性放大与衰减效应,放大效应的变化特征与振动频率紧密相关,衰减效应与岩体夹制作用和振源距有关。岩体表面质点的竖直方向振动速度在较低振动频率时呈现出放大现象;台阶状地形条件下,振动频率增强了振动波的地形放大效应。结合萨道夫斯基公式,提出了影响爆破振动速度的高程放大因子和岩体夹制作用因子,完善了边坡地形振动预测方法,为工程爆破施工设计奠定基础。
The amplification and attenuation effects of blasting vibration in stepped terrain are important factors affecting the stability of slopes and structures.Establish a numerical model of the slope to study the generation and change law of terrain effect during blasting vibration.The test results show that there are obvious amplification and attenuation effects in the vibration velocity of the particle surface of the rock mass in the stepped terrain.The change characteristics of the amplification effect are closely related to the vibration frequency,and the attenuation effect is related to the rock clamp production and the vibration source distance.When the vibration frequency is low,the vertical vibration velocity of the rock mass point exhibits an amplification phenomenon,and the stepped terrain enhances this phenomenon.Considering the influence of elevation magnification factors and rock-mass clamping factors on the blasting vibration velocity,the slope terrain vibration prediction formula is perfected.Provide conditions for engineering blasting construction design.
作者
李敬鹏
LI Jingpeng(Anhui Magang Mining Resources Group Co.,Ltd.)
出处
《现代矿业》
CAS
2020年第10期57-60,共4页
Modern Mining
关键词
边坡
台阶状地形
爆破振动
预测模型
数值模拟
slope
step topography
blasting vibration
prediction model
numerical simulation
