大采高坚硬顶板双向聚能爆破弱化试验研究

Experimental Study on Weakening of Large Mining Height Workface with Hard Roof by Bidirectional Shaped Charge Blasting Technology

本文为解决木瓜煤矿南区首采面10-202工作面顶板难以垮落的问题,利用FLAC3D软件建立坚硬顶板爆破三维数值计算模型,分析爆破切顶对悬顶的影响及断裂机理,在此基础上采用双向聚能爆破技术控制顶板。实践表明双向聚能在大采高坚硬顶板条件下,可以定向预裂使初次来压步距缩短到35 m左右,保证了安全生产。

In this paper,in order to solve the problem that the roof of the first working face 10-202 in the south of Mugua coal mine is difficult to collapse,the three-dimensional numerical calculation model of hard roof blasting is established by using FLAC3Dsoftware,and the influence of blasting roof cutting on suspended roof and fracture mechanism are analyzed.On this basis,bidirectional shaped charge blasting technology is used to control the roof.The practice shows that under the condition of large mining height and hard roof,the directional pre-splitting roof by bidirectional shaped charge blasting technology can shorten the initial pressing step of the roof to about 35 m and ensure safe production.