大直径中空直孔掏槽爆破破岩过程分析

Analysis of Rock Breaking Process in Large⁃diameter Hollow Straight Hole Cut Blasting

建立了大直径中空直孔掏槽爆破的力学模型,采用FEM-SPH(Finite Element Method-Smooth Particle Hydrodynamics)耦合算法对破岩过程进行了数值模拟。结果表明:该数值模拟方法能够直观展示大直径中空直孔掏槽爆破破岩全过程,爆破破岩过程分为端部爆破漏斗形成和槽腔岩体抛掷两个阶段;理论计算所得端部爆破漏斗边界与数值模拟所得漏斗边界基本一致,而理论计算所得最终槽腔边界与数值模拟所得槽腔边界存在差异,数值模拟所得最终槽腔边界呈倒立钟形,更符合最终槽腔边界的实际观测情况。研究结果为合理确定大直径中空直孔掏槽爆破参数提供了理论依据。

A mechanical model for large-diameter hollow straight hole cut blasting was established,and the rock breaking process was numerically simulated using the FEM‐SPH(Finite Element Method-Smooth Particle Hydrodyna-mics)coupling algorithm.The results show that,This numerical simulation method can visually display the entire process of rock breaking by large-diameter hollow straight hole cut blasting,which is divided into two stages:the formation of end blasting funnel and the throwing of groove rock mass.The boundary of the end blasting funnel calculated by theory is basically consistent with the boundary of the funnel obtained by numerical simulation.However,there is a difference between the final groove boundary calculated by theory and the groove boundary obtained by numerical simulation.The final groove boundary obtained by numerical simulation is in an inverted bell shape,which is more in line with the actual observation situation of the final groove boundary.The research results provide a theoretical basis for reasonably determining the parameters of large-diameter hollow straight hole cut blasting.