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通过对超前深孔顶板爆破防冲机理及影响因素进行分析,以典型的冲击危险矿井为背景,在对顶板强度及爆破参数现场实测的基础上,模拟分析不同爆破参数(爆孔夹角、装药段长度)下的超前深孔顶板爆破效果,并采用多种监测手段对其现场防冲效果进行检验。研究发现,在爆孔深度一定的前提下,相同的爆孔角度,随着装药量的增加,超前深孔顶板爆破的影响范围也随之增大,巷帮煤体内的高应力区范围及峰值应力梯度下降越明显。在相同装药量前提下,通过调整爆破角度下,可使巷帮的高应力向深部转移甚至消失,对深部煤炭的安全开采具有重要的意义。
Based on the analysis of roof blasting strength and blasting parameters in the typical impact hazard mine, the blasting mechanism and its influencing factors of the advanced deep hole roof blasting are analyzed. According to the blasting parameters Length of drug section) ahead of the deep hole blasting effect, and the use of a variety of monitoring methods to test its on-site anti-shock effect. The results show that with the same blasting angle, with the increase of charge, the influence scope of the blasting of the advanced deep hole roof also increases. The range and peak value of high stress zone The more obvious the gradient of stress drop. Under the premise of the same charge, by adjusting the blasting angle, the high stress of laneway can be transferred or even disappeared to the deep, which is of great significance to the safe mining of deep coal.