爆破振动对尾矿库稳定性影响分析研究

Stability analysis of tailings pond by blasting vibration

为研究露天开采爆破活动对临近尾矿库稳定性影响及加高扩容后安全性分析,本文以彭山锡矿露天采场爆破活动为研究背景,进行了不同平台不同爆破药量的爆破测振试验,并结合实测情况,基于有限差分软件FLAC3D,模拟尾矿库增高扩容后爆破振动响应情况。研究表明:通过分析三组爆破测振试验结果,发现爆心距及总药量是影响测点合振速度的重要因素;基于爆破测振试验结果,通过MATLAB进行线性拟合得出萨道夫斯基公式的k、α值,k=4.5963,α=0.8843;通过FLAC3D数值模拟分析,当尾矿坝加高到设计最高值119m时,露天采场以现有爆破方式所产生爆破振动对尾矿坝影响较小。

In order to study the influence of blasting activities on the stability of adjacent tailings reservoir and the safety analysis after heightening and expanding the capacity of the tailings reservoir,this paper takes the blasting activities in the open-pit quarry of Pengshan Tin Mine as the research background,carries out the blasting vibration test of different blasting charges on different platforms,and simulates the tailings based on the finite difference software FLAC3D according to the actual measurement The response of blasting vibration after enlargement of ore storage capacity.The results show that : through analyzing three groups of blasting vibration test results,it is found that the blasting center distance and the total charge are the important factors affecting the combined vibration velocity of the measuring points;based on the blasting vibration test results,the K and α values of Sadowski formula are obtained by linear fitting through MATLAB,K = 4.5963,α= 0.8843;through FLAC3D numerical simulation analysis table.It is clear that when the tailings dam is heightened to the highest design value 119m blasting vibration produced by the current production charge and blasting method has little influence on the tailings dam.