爆破地震波作用下含断层结构面高陡边坡动力响应分析

为了防止白马铁矿及及坪采场含断层的岩质边坡受爆破振动作用发生失稳,利用小波分析对现场监测点爆破地震波进行频谱能量分析,得到断层影响下高陡边坡爆破振动波传播规律,同时根据实际边坡建立边坡模型,分析在爆破振动作用下边坡断层岩体劣化效应对边坡动力响应及损伤规律的影响。结果表明:1)当爆破地震波在含断层结构面的高陡边坡中传播时,断层结构面对爆破地震波在边坡中的传播规律影响显著;2)爆破振动波在断层岩体区域传播时,断层岩体力学强度对振动波的传播有明显的影响,断层力学强度越低,对振动波的传播阻隔效果越明显。断层岩体力学强度的劣化加速了爆破振动波传播的衰减;3)不同断层岩体参数劣化工况下爆破振动下边坡损伤有明显变化,随着断层岩体力学强度的劣化,边坡抵抗变形能力减弱。

Dynamic Response Analysis of High Steep Slope with Fault Structural Plane under Blasting Seismic Wave

Abstract: In order to prevent the rock slope with faults in Baima Iron Mine and Jijiping stope from being unstable by blasting vibration, the wavelet analysis is used to analyze the spectrum energy of blasting seismic waves at on-site monitoring points, and the propagation law of blasting vibration wave of high and steep slope under the influence of faults is obtained. At the same time, the numerical simulation software is used to establish the slope model, and the influence of the deterioration effect of slope fault rock mass on the dynamic response and damage law of slope under blasting vibration is analyzed. The results show that : ( 1 ) When the blasting seismic wave propagates in the high and steep slope with fault structural plane, the fault structural plane has a significant influence on the propagation law of blasting seismic wave in the slope. ( 2 ) When the blasting vibration wave propagates in the fault rock mass area, the mechanical strength of fault rock mass has obvious influence on the propagation of vibration wave. The lower the mechanical strength of fault is, the more obvious the blocking effect on the propagation of vibration wave is. The deterioration of mechanical strength of fault rock mass accelerates the attenuation of blasting vibration wave propagation. ( 3 ) The slope damage under blasting vibration has obvious changes under different fault rock mass parameters. With the deterioration of mechanical strength of fault rock mass, the slope resistance to deformation is weakened.