凸形地貌对爆破震动波传播影响的数值模拟  

Numerical simulation of influence of protruding topography on blasting vibration wave propagation

作　　者：唐海[1,2] 李俊如[2] 

机构地区：[1]湖南科技大学煤矿安全开采技术湖南省重点实验室,湘潭411201 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉430071

出　　处：《岩土力学》2010年第4期1289-1294,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金重点项目(No.50439030);国家自然科学基金资助(No.50974059);湖南省教育厅资助科研项目(08c325)

摘　　要：应用UDEC程序模拟了爆破震动波在两种凸形地貌中的传播特征,并与广东岭澳核电站2期基础爆破开挖现场监测结果进行了对比。结果表明,凸形地貌对爆破震动波具有明显的放大作用,其数值模拟结果与现场监测结果吻合得比较好。研究结果还揭示,在一定爆破能量下,爆破震动波速度放大系数并不随台阶型凸形地貌的增高而单调增加,而是先随凸形地貌高度的增加而增加,在凸形地貌高度达到某一临界值时放大系数达到最大值,当凸形地貌高度超过这一临界值时,放大系数随凸形地貌高度的增加而减小。另外,在孤立凸形地貌下爆破振动波速度放大系数还与凸形地貌的高宽比有关。Based on blasting vibration monitoring for the second phase for Ling-ao Nuclear Power Station, in Guangdong Province, the wave propagation characteristics under blasting in concave landforms are simulated with UDEC. It is found that the protruding topography can enhance scale of vibration wave of blasting, and the numerical simulation results agree well with that by site monitoring. The numerical results show that, under protruding topography, the amplified coefficient of velocity of vibration wave of blasting does not monotonously increase with the height of terrains. In the definitive energy of the explosion source, it is found that the amplified coefficient increase when the height of protruding topography is below a critical point, but it will decrease if the height of protruding topography exceed the critical point. The amplified coefficient is also relative to the ratio of height to width under condition of isolated protruding topography.

关 键 词：凸形地貌 爆破震动波 放大系数 临界值 数值模拟 

分 类 号：TD235.11[矿业工程—矿井建设]