空气垫层装药爆破过程中爆炸应力场衰减规律的初步探讨

利用爆炸力学理论,得到空气垫层装药爆破的孔壁压力及其爆炸应力场.首次提出了爆生气体二阶段膨胀理论的临界不耦合系数的计算方法,得出了随不耦合系数的增大,应力峰值迅速降低;装药段的应力峰值进区较垫层段大,但远区则相近;无论是径向还是切向,岩石内首先出现的均是压应力,而后转变为压应力.

Preliminary Probe into the Attenuation Law of Blast Stress Field Created in the Course of Detonation with Air Cushion Charging Construction

Based upon blasting mechanics theory,pressure on the wall of borehole and blast stress field are gained in the course of detonation with air cushion charging construction.For the first of time,the two-phase explosive gas expansion theory and the computing method of critical decoupling coefficient are presented.The peak value of stress rapidly reduces following the increment of decoupling coefficient.The peak value of stress in near zone is bigger than that in the cushion sect,and close in far zone.Compressive stress appears first,radially and tangentially alike,in the rock,then it becomes tensile stress.