摘要
河谷下切引起的应力集中是显著的 ,河谷地区许多构造形迹及地下工程中出现的若干围岩稳定问题都与此有关。半圆形河谷的应力集中系数为 3 0 7;U字形、V字形河谷的应力集中系数均大于 3。河床岩体处于σ1>σ2 、σ3 ≈ 0的应力状态 ,理论上具有形成分别平行于和与σ1小角度相交的压致拉破坏及两组共轭剪切构造的潜势。河床及部分岸坡岩体中的缓倾角结构面、层间错动带及层间虚脱等宏观构造形迹是这些破坏潜势的具体体现 ;河床岩饼破裂面是上述应力集中引起岩石流变而形成的破劈理。
The stress concentration caused by river valleys is conspicuous with which some structural phenomena in river valley and rock stability of underground structure have relationship. The coefficient of stress concentration of a half round\|shape and V\|shape valleys are greater than 3. When the rockmass in river bed is under the stress state of σ 1>σ 2 and σ 3≈0, there is the potential for tension failure and shear failure. The gently dipping structural faces and innerstratal fractures in the river bed rockmass and slope rockmass controlled by river valleys are the results of the failure potential. The phenomenon of core discing in river valley rockmass is formed by the flowing deformation under the river bed stress concentration.
出处
《工程勘察》
CSCD
北大核心
2003年第1期4-7,12,共5页
Geotechnical Investigation & Surveying
基金
国家自然科学基金资助 (40 2 72 119)
教育部科学技术研究重点项目 (地方 0 2 14 0 )
云南省自然科学基金项目 (2 0 0 1E0 0 0 1G)
关键词
岩体响应
河谷
流变
应力集中
缓倾角结构面
岩饼
river valley
flowing deformation
stress concentration
gently dipping structural face
core discing
