土体中垂直柱状药包的爆炸裂隙研究

Study on Explosion Crack of Vertical Columnar Explosive Cartridge in Soil

分析了爆炸裂隙开裂及扩展机理,进行了土体中垂直柱状药包的现场爆破试验,研究了爆腔壁面爆炸裂隙展布,统计了柱状腔壁和底部半椭球腔壁的爆炸裂隙参数。结果表明:柱状腔壁上的爆炸裂隙较宽、较深,底部半椭球腔壁上裂隙细密,且较浅、较窄,裂隙条数随不耦合系数增大呈指数减少;柱状腔壁的裂隙深度与开口宽度随不耦合系数增大而先增后减,K≈1.2时,开口宽度出现最大值为2.50cm,深度出现最大值为9.24cm;底部半椭球腔壁的裂隙深度与开口宽度随不耦合系数增大而减小。

Mechanism of explosion crack crack and extend are analyzed theoretically,site blasting test of vertical columnar explosive charge in soil was done,research on explosion crack state of blasting cavity wall was done,statistic on explosion crack parameter of columnar cavity walls and semi ellipsoidal cavity walls at bottom were done.The result indicates that explosion crack on columnar cavity walls are much wide and deep,crack on bottom semi ellipsoidal cavity walls are compactness,much shallow and narrow,index decreased of crack quantity with the increase of decouple coefficient;crack depth and opening width of columnar cavity walls first increased then decreased with the increase of decouple coefficient,maximum of opening width was 2.50cm,maximum of depth was 9.24cm;crack depth and opening width of bottom semi ellipsoidal cavity walls decreased with the increase of decouple coefficient.