露天矿岩质边坡爆破振动响应特征研究

Study on the Response Characteristics of Rock Slope Under Blasting Vibration in Open-pit Mine

为了客观反映岩质边坡体对爆破振动的响应程度,在反应谱理论的基础上,采用加速度反应谱及动力系数分析方法,对实际工程中采集到的爆破振动信号进行了分析。结果表明,边坡体内在阻尼比对爆破振动响应影响很大,试验场地条件下,边坡体在爆心距35-46m范围内对爆破振动具有多振型、多频带的响应特征,在爆心距47-57m范围内对爆破振动响应存在明显的放大效应,阻尼比为0.03时,响应增大1倍。

In order to objectively reflect the degree of response of rock slope body under blasting vibration,on the basis of the response spectrum theory,acceleration response spectrum and dynamic coefficient method were used to analyze the blasting vibration signals collected in the actual projects.The results showed that the internal damping ratio of the slope had great response on blasting vibration.In the testing site,the slope body had multiple modes and multi-band characteristics to the response of blasting vibration at the blasting distance range of 35-46 m.And the response had obvious amplification effect on blasting vibration at the blasting distance range of 46-57m.When the damping ratio was 0.03,the response effect increased by1 time.