ABSTRACT
Since the 20th century, the ore proportion of both domestic and overseas open-pit mining is considerable in ore yield. For our country (Liu 1995), metal mine open-pit mining of iron ore accounts for about 80%∼90%, non-ferrous metals accounts for about 40%∼50%, and chemical materials accounts for 70%, building materials accounts for 100%, proportion of open-pit coal mining has been about 5%. In recent years, some large open-pit mine areas have set up, which suggests that the development potential of coal mining in future is very huge. Since the 1990s to the beginning of this century, with the development and utilization of resources, deep sunken open pit mine has become the trend of the open-pit mine in the world, and the resulting high steep open pit slope stability problem has been closely watched. With the rapid development of science, technology, economy, the excavation blasting technology is widely applied in open pit mining. But because of its complexity and moments in blasting, it is difficult to study its mechanism and function feature. At present, the problem of slope stability under blasting load research has aroused many scholars attention. Such as Gong Jianwu, Xia Caichu (Gong et al. 2007) do test and analysis through the dynamic response of tunnel in the blasting load; Liu MeiShan (Liu 2007) do the detailed research of
Drilling blasting is the main form of Open-pit mine blasting. If the load can be directly loaded into the surface of blasting effect which has the same form with hole, it is even more consistent with actual blasting load. Attenuate blasting load out of the shatter zone, equivalent to a triangle wave load applied to the numerical model, and the actual hole blasting load forms are very similar, which makes its open-it mine blasting load can achieve the result of simulation. Comparation with another loading method that analysis slope stability by equivalent applying blasting vinration acceleration in section, the equivalent loading method is more accurate, reliable and it provides some useful guidance for actual engineering safety blasting.
