爆炸荷载作用下裂隙岩体内损伤范围的观测研究

Observation study of fissure rock damage range under blasting load

通过电法CT成像技术,探测微量炸药爆炸前后裂隙岩体深孔之间电阻率的变化,查明探测切面内的岩体损伤裂隙发育形态和空间展布。通过实验可知:微量炸药爆炸后在裂隙岩体的炮孔深部可以形成一定范围、一定数量和一定宽度的裂隙,其中裂隙形成的区域主要集中在炮孔口深的2/3处,当炮孔深度3 m,装药量为330 g时,在眼深1.5～2.5 m处裂隙较为发育,炮孔间距为1.2 m～1.5 m时,可在岩体内部形成贯通裂隙。

Detecing the changes of resistivity in deep holes of fissure rock before and after micro explosive blasting to the limestone in Luyuan Mountain Villa with electrical CT image, a certain range, number and width fissures could develop in deep blasting holes after micro explosive blasting, and areas which were caused by fissures mainly located at about 2/3 depth of the bottom of the blasting holes.when the depth of blasting hole is 3 m, and the explosive weighted 330g ,fissures developed easily at the depth of 1.5-2.5 m of the blasting hole.when the distance between the blasting holes is 1.2-1.5 m, penetration fissures could form in the internal rock, providing scientific basis for blasting engineering design and construction.