摘要
岩石的变形破坏与裂纹的发育过程密切相关。将岩石的变形分解为 :岩石介质的变形、张开裂纹的闭合、滑移引起的变形和由于分支裂纹扩展引起的变形。研究了岩石微裂纹的闭合、滑移、扩展以及相互作用的过程 ,并给出了裂纹扩展在各阶段引起的宏观变形。将上述三种机制引起的变形叠加 ,得到加载过程中岩石的应力 应变关系 ;与试验数据对比显示 ,两者的应力 应变关系吻合较好。
A mesoscopic model is presented to describe the mechanisms of deformation and failure for brittle rocks. In the loading process, the mechanical states of rocks are much related to microcracks. In the model, the macroscopic deformation of rocks is divided into three parts including deformation of rock media, deformation induced by the closure and sliding of micocracks, and deformation induced by the formation of kinked cracks. The closure, sliding and growth of microcracks of rocks are analyzed and the calculation formulae of each part are established. The above deformations are summed to obtain the stress-strain curves in the loading process. Compared with testing data, it is shown that the laws of stress-strain relationship obtained by two different methods are similar.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2001年第2期151-155,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金! (599740 1 5)资助项目
关键词
脆性岩石
变形破坏
力学模型
载荷
Brittleness
Crack propagation
Deformation
Failure (mechanical)
Mathematical models
Microcracks
Strain
Stress analysis
