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Stress Concentration of River Valleys and the Response of Rockmass
Author(s): 
Pages: 4-7,12
Year: Issue:  1
Journal: Geotechnical Investigation & Surveying

Keyword:  河谷 流变 应力集中 缓倾角结构面 岩饼;
Abstract: 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。
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