摘要
岩体开挖是一个不断卸荷、变形损伤、质量劣化的动态力学过程。卸荷状态下,拉剪复合断裂是岩体断裂中最危险的一种情况。现应用断裂力学和损伤力学,对裂隙卸荷损伤岩体的力学性质进行研究。总结拉剪应力状态下裂隙岩体损伤力学模型,分析得出:拉剪应力状态下裂隙裂化、损伤积累,损伤演化表现为"动态损伤";而后以某水电站边坡的开挖卸荷为例,验证了岩体裂隙损伤贯通直至破坏的过程。
Rock mass excavation is a continuous dynamic mechanics process of unloading,deformation damage and quality deterioration.Under the unloading state,tensile-shear fracture is one of the most dangerous cases.Based on fracture mechanics and damage mechanics,this paper presents the mechanical properties of the rock under unloading fracture damage and summarizes the damage mechanics model of tension-shear fractured rock mass.The conclusion is that fissure cracking,damage accumulation and evolution are performed as ＂dynamic damage＂ under tensile-shear stress.Finally,as a case study of a hydroelectric station,the slope excavation unloading shows the process from damage accumulation to total failure of rock mass.
出处
《西北水电》
2010年第4期17-20,共4页
Northwest Hydropower
关键词
裂隙岩体
拉剪应力
卸荷损伤
动态演化
Fissured rock mass
tensile-shear stress
unloading damage
dynamic evolution
