空气间隔装药爆破条件下边坡振动规律研究

发布时间：2018-07-31 12:22

【摘要】：采用数值分析软件,结合大型矿山边坡工程,讨论了爆炸等效荷载的施加过程,分析了空气间隔装药条件下边坡爆破振动规律。计算表明:随着质点与爆源垂直距离的增加,爆破质点振动速度峰值整体上呈减小趋势,其中水平径向振动峰值比垂直振动速度峰值衰减慢;空气层位置变化对爆源近、中区质点振动峰值存在影响,而对爆破远区振动特性影响有限。通过坡面点和马道外侧点的振动速度对比分析得出:边坡台阶存在局部的爆破振动放大效应。另外,采用文中的荷载施加方案既可以明确炮孔近区岩体的破坏机理,也能将炮孔装药结构所对应的爆破荷载信息在后续模型计算中予以保留,为优化装药结构、提高爆炸能量利用率提供参考依据。
[Abstract]:The application process of explosive equivalent load is discussed by using numerical analysis software and combined with large-scale mine slope engineering. The blasting vibration law of slope under the condition of air-spaced charge is analyzed. The calculation results show that with the increase of vertical distance between particle and explosion source, the peak value of blasting particle vibration velocity decreases, and the peak value of horizontal radial vibration decreases more slowly than that of vertical vibration velocity, and the change of air layer position is close to the explosion source. The peak value of particle vibration in the middle area is affected, but the vibration characteristic in the far area of blasting is limited. By comparing the vibration velocities between the slope points and the outside points of the track, it is concluded that the local blasting vibration amplification effect exists in the slope steps. In addition, the loading scheme in this paper can not only clarify the failure mechanism of rock mass near the blasting hole, but also preserve the blasting load information corresponding to the blasting hole charge structure in the subsequent model calculation, so as to optimize the charge structure. Improving the energy utilization ratio of explosion provides reference basis.
【作者单位】：武汉科技大学理学院中铁港航-武汉科技大学爆破技术研究中心;武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(编号:51004079;51479147) 湖北省自然科学基金项目(编号:2014CFB822) 湖北省教育厅科学研究项目(编号:Z200511003)
【分类号】：TD235.4

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