摘要
为研究裂纹在层状岩石中的扩展特征,通过数字图像相关方法观测裂纹在层状岩石中的扩展过程,并通过数值模拟方法研究岩石强度对裂纹在层状岩石中扩展的影响。研究表明,裂纹在层状岩石的扩展过程中,载荷曲线具有双峰值特征,各峰值时刻分别对应于界面层两侧岩石的起裂时刻,峰值大小随岩石强度的增高而升高;界面层破裂及界面滑动,对裂纹扩展具有止裂作用,止裂效果随界面层不含裂纹一侧岩石强度的增高而提高;受界面层破裂和界面滑动的作用,裂尖沿界面层发生迁移,裂纹在层状岩石中的扩展呈非连续性扩展特征。
In order to study the crack extension characterristics in stratified rock, the crack extension process in stratified rock specimen was measured utilizing digital image correlation method（DICM） ,and the rock strength influence on crack extension was simulated by numerical method. The analysis results show that the load-time curves during the crack extension process have double peaks, and each of them corresponds respectively to the crack initiation time on both sides of the interface, with the increase of the rock strength the values of load peak increases ; inteffacial failure and slip can arrest the crack extension, and as the strength of rock on the other side of the interface increases the interfacial slip and crack arresting effect increase;the crack propagation in stratified rock is a discontinue process, which is caused by the inteffacial slip.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第2期315-321,共7页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2010CB226803)
国家自然科学基金资助项目(41002075)
地震动力学国家重点实验室资助项目(LED2008B08)
关键词
层状岩石
裂纹扩展
数字图像相关方法
界面滑动
stratified rock
crack propagation
digital image correlation method （D1CM）
inteffacial slip
