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露天煤矿在开采的进程中,受到矿区周边许多小煤窑所遗留下来的采空区和巷道的影响,致使工作人员在有采空区或者巷道的区域内爆破时,发生了很多安全隐患。以安家岭露天矿生产过程中所遇到的情况为例,安家岭露天矿在工作帮不断推进的过程中,露天矿工作台阶或者是边帮下都出现了小煤窑开采留下的巷道和采空区,严重影响露天矿爆破效率和效益。就露天矿存在采空区和不存在采空区,在相同爆破条件下,通过Ls-dyna软件进行数值模拟,对其爆破效果做比较。
In the process of mining, the open-pit coal mines are affected by the goafs and roadways left by many small coal mines around the mines, resulting in many potential safety hazards when the workers blast in areas with goafs or roadways. Take the case of Anjialing open-pit mine during production as an example. During the work of Anjialing open-pit mine, the workings of the Anjialing open- Empty area, seriously affecting the efficiency and efficiency of opencast blasting. The mined-out area and the absence of gob area exist in the open-pit mine. The numerical simulations are carried out by Ls-dyna software under the same blasting conditions, and the blasting effects are compared.