爆炸落石抛掷速度影响因素的数值分析

运用有限元软件LS-DYNA模拟弹体在岩石边坡内爆炸的过程,对不同岩石性质、不同弹体装药量和不同侵彻深度下爆炸落石速度进行了计算分析。计算结果表明:不同地质岩质的爆炸落石抛掷速度不同,岩石密度越大,则落石抛掷速度越小;随着弹体装药量增加,处于爆破中区的落石抛掷速度增加不明显,爆破近区和爆破远区的落石速度增加比较快;随着弹体侵彻深度增加,爆炸落石的抛掷速度逐渐减小。同时,由于破坏区各点在能量的吸收和转化上并不一致,在破坏区内,爆炸落石的抛掷速度并不与到爆心的距离成正比。

NUMERICAL ANALYSIS OF EXPLOSION ROCKFALL VELOCITY WITH DIFFERENT FACTORS

ANSYS LS-DYNA was applied to simulate the explosion process of rock slope and the tossed velocity of rockfalls under the impact of different rock properties,explosive loads and penetration depth was calculated and analyzed.The results showed that different rock properties would form different tossed velocity of rockfalls,the larger the rock density was,the slower the tossed velocity of rockfalls was.With the increase of explosive load,the tossed velocity of rockfalls in the middle explosion area was not increased obviously,while in near and distant explosion areas,the tossed velocity of rockfalls was increased rather quickly.And with the increase of penetration depth,the tossed velocity of rockfalls was reduced gradually.Meanwhile,because the absorption and transformation of energy was different in damaged areas,the tossed velocity of rockfalls was not in proportion to the distance from the positon where the rockfall formed to the explosion center.