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针对切槽定向断裂控制爆破进行了ABAQUS数值模拟研究,采用内聚力模型(CZM)成功模拟了爆生主裂纹的起裂和扩展过程。数值模拟结果表明,炸药起爆后,切槽炮孔在20μs时首先在切槽尖端产生损伤,在25μs时产生爆生裂纹,并在130μs时扩展至模型边界;炮孔切槽周围形成了较强的拉伸应力区,拉应力使爆生裂纹沿切槽方向优先起裂扩展,切槽方向的最大主拉应力峰值随时间呈先增大后减小的趋势;而在非切槽方向形成了压应力区,压应力的存在限制了非切槽方向裂纹的张开;切槽方向拉应力区形成的裂纹生长区和非切槽方向压应力区形成的裂纹抑制区的共同作用,使爆生裂纹沿切槽方向起裂、扩展,并最终形成断裂面。
ABAQUS numerical simulation is carried out for the controlled blasting of slotted directional fracture. The initiation and propagation of the main crack in the explosive are successfully simulated by the cohesion model (CZM). Numerical simulation results show that when the explosive is detonated, the slotted hole first damages the slotted tip at 20μs and produces an explosive crack at 25μs and extends to the model boundary at 130μs. The hole around the hole is formed stronger Of the tensile stress zone, the tensile stress causes the pre-crack crack to propagate preferentially along the notch direction, and the peak value of the maximum principal stress in the notch direction first increases and then decreases with time; while in the non-notch direction The existence of the compressive stress zone and the compressive stress limits the opening of the crack in the direction of the non-notched groove; the crack growth zone formed by the tensile stress zone in the grooving direction and the crack suppression zone formed in the non-notched direction compressive zone make the explosive The crack starts to crack and expand along the direction of the notch, and finally the fracture surface is formed.