For the past simulation analysis using FLAC 3D software without considering the dynamic update of the model , in order to truly reflect the mining process by the natural caving method , the ideas , principles and procedure of the dynamic up-dating model for the simulation of ore-rock caving process based on FLAC 3D software were studied , and the corresponding pro-gram codes were compiled by using the embedded FISH language .Taking a large-scale copper mine mined by the natural caving method in Southwest China as an application example , the evolution of its ground pressure was simulated in combination with the step-by-step undercutting scheme .The mining process was reproduced by automatically identifying the caving area , auto-matically eliminating and reappearing units , and modifying the unit mechanical parameters .According to the volume of the unit to be reproduced and the void volume , the balance relationship between the undercutting speed and the ore drawing speed was determined , so as to guide the mine to reasonably determine and adjust the undercutting and ore drawing speeds .%针对以往应用FLAC3D软件模拟分析时,没有考虑模型动态更新,以真实反映自然崩落法开采过程的问题,研究了基于FLAC3D软件,进行矿岩崩落过程模拟的模型动态更新思想、原则和流程,利用内嵌FISH语言编制了相应的程序代码.以西南某采用自然崩落法开采的大型铜矿为应用实例,结合每一步拉底方案模拟其地压演化状态,通过自动识别崩落区、自动消除和重现单元,并修改单元力学参数,再现了矿山开采过程,根据待重现单元体积与空隙体积,确定拉底和出矿速度的平衡关系,从而指导矿山合理确定和调整拉底和放矿速度.
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