岩体单孔爆破损伤的三维数值模拟研究  

Three-dimensional numerical simulation of single hole blasting damage in rock mass

作　　者：刘帅 王卫华[1] 张恒根 张理维 LIU Shuai;WANG Wei-hua;ZHANG Heng-gen;ZHANG Li-wei(School of Resource and Safety Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《工程爆破》2023年第1期10-18,共9页Engineering Blasting

基　　金：国家自然科学基金资助项目(41372278)。

摘　　要：为了探究单孔爆破情况下岩石损伤情况,基于ANSYS/LS-DYNA软件,采用RHT材料模型,建立了多组三维数值模型,探究了三维空间下岩石单孔爆破在不同装药长度、不同地应力条件下的损伤情况,并结合自定义变量—有效损伤率来表征岩石在单孔爆破条件下损伤的时空演化规律。结果表明:从孔底到自由面,岩石的损伤逐渐增大,距离炮孔越近,岩石的损伤越严重;随着装药长度的增加,围岩对药卷的空间约束作用也在增强,岩石损伤的增长速率会逐渐减小;地应力在岩石的爆破过程中对岩石损伤具有抑制作用,且岩石损伤会向着地应力最大的方向发展。In order to explore the rock damage in the case of single hole blasting,based on ANSYS/LS-DYNA software and using RHT material model,establishes several groups of three-dimensional numerical models to explore the rock damage in the three-dimensional space of single hole blasting under the conditions of different charge lengths and different in-situ stresses.Combined with the effective damage rate,the spatiotemporal evolution law of rock damage under the condition of single hole blasting is characterized.The results show that the damage of the rock increases gradually from the bottom of the hole to the free surface,and the closer to the hole,the more serious the damage of the rock is.With the increase of charge length,the spatial constraint effect of surrounding rock on the charge volume is also strengthened,and the growth rate of rock damage will gradually decrease.In the process of rock blasting,the in-situ stress has a restraining effect on the rock damage,and the rock damage will develop towards the direction of the maximum in-situ stress.

关 键 词：岩石损伤 数值模拟 RHT模型 单孔爆破 有效损伤率 

分 类 号：TD235[矿业工程—矿井建设]