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影响岩体爆破质量的垂直炮孔堵塞长度研究

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Keywords: 隧道工程,堵塞长度,刚体动力学,垂直炮孔,爆破试验

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Abstract:

垂直炮孔堵塞长度对岩体爆破质量有直接影响。为获得最优堵塞长度的计算方法,首先分析了炮孔堵塞作用机理及堵塞物的运动过程,给出了计算爆生气体压力的公式,然后由爆生气体压力和堵塞物整体运动推导出了堵塞物加速度,对加速度进行简化处理,再由加速度推导出了堵塞物整体运动时间与堵塞物位移的关系式,最后结合岩体破碎时间建立了计算垂直炮孔堵塞物最优长度的理论模型。进行了不同堵塞长度的爆破效果试验,试验结果表明,堵塞长度为0.55m时,爆破效果是最好的;得到了爆破质量随堵塞长度的变化规律,在试验的爆破参数下通过理论模型计算出的最优堵塞长度是0.46m,理论值与试验值十分接近,证明了理论模型的正确性和实用性。

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