In order to make the previous blasting model based on particle flow closer to reality, the original model was improved from 2D simulation to 3D microscopic simulation of blasting. Based on the theory of energy conserva-tion, it was postulated that the energy generated by blasting would be borne by rock mass in a certain range around the detonation point, and be translated into kinetic energy, then the energy would be transferred and absorbed in fractured rock and ultimately achieve balance, finally the explosion process would be over. The equations in origi-nal model was changed into equations available for 3D blasting simulation, and the energy distribution and parame-ter setting were adjusted. The microscopic process from the explosion of 100 Kg TNT until the rock balance at A3 detonation point in slope of open-pit mine was simulated by PFC3D. The results showed that through analyzing the variation trends of velocity vector, displacement vector and CForce, the process could be divided into three stages:Step1~100, Step100~350, and Step350~4690. The time was much less than that of original model in simulation to balance, this was mainly because the model was changed from 2D into 3D, with the particle kinetic energy de-creased as 0. 085~0. 128 times with the original model.%为了使作者提出的基于颗粒流的爆破模型更贴近于实际，将原模型从二维模拟推广至三维爆破细观模拟。模型的基本原理为基于能量守恒理论，假设爆炸时刻产生的能量全部由爆点周边一定范围内的岩体承受，并转化为动能，进而能量在碎裂的岩块中传递、吸收，最终达到平衡，爆炸过程结束。将原模型方程改为适用于三维爆破模拟方程，并调整了能量分配和参数设置。使用PFC3D模拟了在露天矿边坡内A3爆破点处100kgTNT爆炸直至岩体回复平衡的细观过程。模拟结果表明研究速度矢量、位移矢量和CForce变化趋势后，可将该过程分为3个阶段：Step 1~100、Step100~350、Step350~4690。其时间远小于原模型模拟至平衡时间，这主要是由于模型从二维转化为三维所造成的。颗粒动能减小为原模型的0．085~0．128倍。
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