高台阶抛掷爆破数值模拟研究

发布时间：2018-06-20 12:11

本文选题：高台阶 + 抛掷爆破　；参考：《中国矿业》2016年S2期

【摘要】：露天煤矿高台阶抛掷爆破效果直接影响着吊斗铲倒堆剥离工效和成本。以黑岱沟露天煤矿现场为原型,通过数值模拟的方法,利用ANSYS/LS-DYNA程序建立了有限元分析单元模型,模拟计算了高台阶抛掷爆破过程。通过对高台阶对称坡面和不同高度位置处抛掷速度进行监测,系统研究分析了爆破过程中速度场随时间衰减变化规律及分布特征。分析表明,数值模拟计算与实验观测结果吻合性较好;岩体在爆炸作用下,高台阶坡面速度随时间呈现加速、准匀速和衰减3个不同的发展阶段;受端头效益影响,对称面上的单元速度随装药位置呈现D形分布,速度峰值Vymax沿X轴台阶走向符合Sigmoidal曲线衰减规律。
[Abstract]:The blasting effect of high step throwing in opencast coal mine directly affects the stripping efficiency and cost of bucket shovel. Taking Heidaigou opencast coal mine as the prototype, the finite element analysis element model was established by using ANSYS- LS-DYNA program by numerical simulation, and the blasting process of high step throwing was simulated and calculated. By monitoring the throwing velocity on the symmetrical slope of high step and at different height, the variation law and distribution characteristics of velocity field attenuation with time during blasting are studied and analyzed systematically. The analysis shows that the numerical simulation results are in good agreement with the experimental observation results, that the slope velocity of high step slope accelerates with time, quasi-uniform velocity and attenuation are three different stages of development under the action of explosion, and is affected by the end benefit. The velocity of the unit on the symmetrical surface shows D shape distribution with the charge position, and the peak velocity Vymax follows the sigmoidal curve attenuation law along the step of the X axis.
【作者单位】：华能煤业有限公司;陕西旬邑青岗坪矿业有限公司;
【分类号】：TD824.2

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