动载下含表面裂纹岩石破坏的近场动力学模拟  

Peridynamic simulation of rock failure with surface flaw under dynamic loading

作　　者：张俊 黄麟淇[1] 刘志祥[1] 李夕兵[1] Jun ZHANG;Lin-qi HUANG;Zhi-xiang LIU;Xi-bing LI(School of Resources 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：《Transactions of Nonferrous Metals Society of China》2024年第7期2313-2327,共15页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51927808,51904335,52174098);the Fundamental Research Funds for the Central Universities of Central South University,China(No.2020zzts199)。

摘　　要：为了研究动态加载下岩石表面裂纹的扩展,基于前期试验结果使用一种考虑压缩和拉伸强度比的弹塑性常规态基近场动力学模型进行数值试验。模拟动态加载下含不同角度和深度三维表面裂纹岩石的破坏过程。模拟结果表明,使用的近场动力学模型可以很好地模拟岩石三维裂纹的扩展和试样的破坏过程。通过近场动力学模拟可以得到与试验结果一致的强度变化规律。试样表面形成的裂纹深入试样内部一定深度,该深度与表面裂纹深度有关。试样内部产生的壳裂纹会与表面形成的裂纹连接形成复杂的三维裂纹。To investigate the propagation of surface flaws in rocks under dynamic loading,an elastic−plastic ordinary state-based peridynamic model that considers the compressive to tensile strength ratio is used for numerical tests based on the results of previous experiments.The failure process of rocks containing three-dimensional surface flaws at different angles and depths under dynamic loading is simulated.The simulation results show that the peridynamic model used can well simulate the propagation of three-dimensional cracks in rocks and the failure process of specimens.Peridynamic simulations can be used to obtain strength variation regularity which is consistent with the experimental results.The crack generated on the surface of the specimen penetrates to a certain depth inside the specimen,which is related to the depth of the surface flaw.Shell-like cracks generated inside the specimen join with cracks generated on the surface to form complex three-dimensional cracks.

关 键 词：动态载荷 表面裂纹 近场动力学 三维裂纹扩展 岩石破坏 

分 类 号：TD315[矿业工程—矿井建设]