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为保持我矿现有生产能力,加速对+7M 水平的开拓工程,凹陷露天下降堑沟于1月22日进行了首次爆破,一次进尺90M(沟起点开始)出入沟宽16M,爆破后因旁冲,沟宽达20M。由于采矿区距粗破车间及附近民房距离较近(200M～300M),药量较大时爆破后对建筑物及民房地震危害较大,因此,过去一次爆破最大药量一般控制在3吨以下。随着开采深度下降,如何减震是我矿生产上遇到的新课题。此外,斜沟的爆破在我矿也是第一次。在吉山铁矿大力支持配合下,我们采用多排孔微差爆破,成功地进行了凹陷出入沟的第一次爆破。一、爆破条件:凹陷出入沟位于东山采区矿体东部边缘,全部堑沟在白云石矿体中沿开
In order to maintain the existing production capacity of mine and speed up the pioneering project of +7 M level, the first open-cut trench cut in open pit on January 22 was carried out for the first time with a footage of 90M (starting point of trench ditch) with a width of 16M. After blasting, Chong, ditch width of 20M. Due to the mining area is near to the coarse broken workshop and nearby houses (200M ~ 300M), the larger the dose, the greater the hazard to the earthquake of buildings and houses. Therefore, the maximum dose of the last blasting is generally controlled below 3 tons . As the mining depth decreases, how to reduce the shock is a new topic in mine production. In addition, oblique trench blasting is also the first time in mine. With the strong support of Jishan Iron Mine, we adopted the multi-row hole millisecond blasting to successfully carry out the first blasting of the ditch outfall. First, the blasting conditions: depression out of the ditch located in Dongshan mining area east edge of the ore body, all the ditch in the dolomite ore body along the open