循环爆破载荷下岩石累积损伤效应研究  

Numerical Study of Cumulative Damage Effect of Rock under Cyclic Blast Loading

作　　者：李允忠 王志亮[1] 黄佑鹏 杨辉 贾帅龙 陈贵豪 LI Yun-zhong;WANG Zhi-liang;HUANG You-peng;YANG Hui;JIA Shuai-long;CHEN Gui-hao(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009 , China)

机构地区：[1]合肥工业大学土木与水利工程学院

出　　处：《爆破》2019年第2期47-53,共7页Blasting

基　　金：国家自然科学基金(51579062、51379147)

摘　　要：为了探究岩石在循环爆破载荷下的累积损伤演化机理与分布规律,基于有限元软件ANSYS/LS-DYNA及其重启动功能,采用Holmquist-Johnson-Cook(HJC)本构模型,对单次爆破损伤问题开展研究,并对计算结果的准确性进行验证,进而对多次循环爆破作用下的岩石损伤累积效应作了数值分析。结果表明:循环爆破载荷下岩石累积损伤演化云图与单次爆破具有相似性,径向裂纹呈交叉放射状延伸,且不同部位的岩石对多次爆破损伤的累积效应不同;累积损伤演化曲线整体上呈现出反“S”形,岩石内部存在裂纹损伤应力阈值,使总损伤区范围呈突跃式发展。此外,发现岩石累积损伤增量在径向上呈现出单峰正偏的Weibull分布形态,且在损伤区中部范围内,其受循环爆破载荷叠加作用的扰动较大。To explore the evolution mechanism and distribution law of rock cumulative damage under cyclic blasting ,the restart function of the finite element software ANSYS/LS-DYNA was adopted. The single blast-induced damage of rock was explored using the Holmquist-Johnson-Cook constitutive model, and the accuracy of the calculated results was further verified. Then, the cumulative effects of rock damage under cyclic blasting were numerically analyzed. Results show that the cloud map of the cumulative damage evolution under cyclic blasting is similar with that under the single blasting. The cracks develop in a cross-radial manner, and the cumulative effect of the blast-induced damage at different locations of the rock is different. The cumulative damage evolution exhibits a reversed-S shaped curve as a whole. A threshold of crack damage stress makes the jump development of total damage scope. In addition, the increment of the accumulative damage shows a single-peak positive Weibull distribution on the radial direction, and the middle of the damage zone is significantly disturbed by the superimposition of cyclic blast loading.

关 键 词：岩石 循环爆破 损伤 累积效应 数值模拟 

分 类 号：O382[理学—流体力学]