超深对深孔台阶爆破作用影响的数值模拟  

NUMERLCAL SIMULATION OF INFLUENCE OF SUBDRILLING ON DEEP HOLE BENCH BLASTING

作　　者：丁希平[1] 冯叔瑜[1] 王中黔[1] 

机构地区：[1]铁道部科学研究院铁建所,北京100081

出　　处：《中国矿业》2000年第2期30-33,共4页China Mining Magazine

摘　　要：本文通过三维有限元法建立三维深孔台阶爆破计算模型 ,分析深孔台阶爆破底部应力场的分布规律。分析表明 ,深孔台阶爆破有效应力场呈近似椭球状分布 ,炮孔端部具有明显的端部效应 ;随着超深长度的增加 ,底部应力场逐渐增强 ;超深长度存在临界值Δh0 ,当超深长度Δh≥Δh0 时 ,底部应力场强度基本不变。在本文的计算中临界超深值与抵抗线W的比值等于 0 3。In this paper a three dimensional deep hole bench blasting model is established by 3D finite element method,and the distribution of stress field at the bottom of the bench is studied.The result shows that the shape of the effective stress field of deep hole bench blasting is quasi ellipsoid and the tip effect appears at both ends.With the increase of subdrilling,the effective stress field at the bottom is enhanced.A critical value of subdrilling exists.When subdrilling of deep hole bench blasting is greater than the critical value (Δh 0),the effective stress at the bottom is almost the same.In this paper the critical value of subdrilling is 30 percent of burden.

关 键 词：超深 深孔台阶爆破 应力场 有限元法 数值模拟 

分 类 号：TD235.33[矿业工程—矿井建设]