摘要
合理准确地再现爆破漏斗的形成过程对爆破模拟及工程设计具有重要意义。通过设置人工节理,将模型进行预先离散,在离散元程序3DEC中实现了半无限介质中爆破模拟,包括从炮孔扩张、裂隙发展、岩块飞散到爆堆成型的全过程。讨论了爆炸荷载简化、施加方式和离散方法等对岩石爆破破碎、抛掷及爆堆形成过程的影响。其中对人工节理的倾角和分布进行了重点研究,通过优化人工节理方向,使得模拟结果更符合实际。将爆破块度与岩体离散化结合,提出考虑爆破块度的3DEC人工离散方法,提高了模拟结果的精度。采用该模型与现场试验进行比较,模拟得到的漏斗底半径及深度与试验结果相符。并且该模型大幅度提高计算速度和计算稳定性,可广泛应用于生产实践中,为爆破设计提供参考。
The reasonable simulation of formation process of blasting crater has great significance on blasting simulation and engineering design. By setting artificial joints in the discrete element model, the blasting process in a semi-infinite medium was simulated with software 3DEC. Then, the simplification and loading method of blast load and the effect of discrete approach on rock breakage and crater formation were discussed in this paper. Through optimizing the dip angel of artificial joints and combining with blasting fragmentation, an advanced discrete approach was put forward to improve simulation accuracy. Comparing simulation results of advanced discrete approach with filed test, the simulated radius and depth of crater agreed with experiment results well. Moreover, this model reduced operation time greatly as the fewer discrete blocks.
出处
《爆破》
CSCD
北大核心
2014年第3期15-22,共8页
Blasting
基金
国家973计划项目(No.2010CB732003)
国家自然科学基金杰出青年基金项目(No.51125037)
国家自然科学基金面上项目(No.51009013
No.51179138)
关键词
3DEC
离散元
爆破漏斗
爆破块度
3DEC
discrete element method
blasting crater
blasting fragmentation
