摘要
本文提出岩石断裂曲线大体可分为两类,大理岩等性岩石属Ⅰ型断裂,灰岩等脆性岩石属Ⅱ型断裂,产生Ⅱ型断裂的岩石在失稳断裂前没有或很小裂纹亚临界扩展,产生Ⅰ型断裂的岩石在失稳断裂前裂纹有亚临界扩展.文中并研究了用柔度法计算这一裂纹扩展长度的经验公式,文中还试验和分析了预制裂纹对断裂韧度的影响.
It is proposed in this paper that the fracture curves of rocks can be roughly divded into two types, viz., type Ⅰ for ductile rocks such as marble etc. and type Ⅱ for brittle rocks such as limestone etc. In rocks producing fractures of type Ⅰ, there is a stage in which the craek propagates suberitically before unstable propagation; whereas in rocks producing fractures of type Ⅱ, there is very little or even no subcritical propagation of crack before instability. An empirical formula for determining the length of crack propagation by the compliance method is presented and the effect of precrack on fracture toughness is also tested and analysed.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
1990年第4期319-327,共9页
Chinese Journal of Rock Mechanics and Engineering
