危岩主控结构面端部区域应力特征研究  

Study on Tip Stress of the Main Control Structure Surface of Unstable Rock Blocks

作　　者：张景昱[1] 陈洪凯[1,2] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]重庆交通大学岩土工程研究所,重庆400074

出　　处：《科技创新导报》2015年第6期26-27,共2页Science and Technology Innovation Herald

基　　金：国家自然科学基金(编号11272185)

摘　　要：危岩主控结构面端部区域的应力变化是导致危岩破坏的主要因素。针对压剪破坏型危岩,进行室内模型试验。主控结构面端部区域的平面应力状态可以用两个主应变ε1和ε2来表示,在模型主控结构面端部布置了5个测点,试验量测到5个测点在施加荷载过程中两个主应力的变化曲线;对试验结果分析表明,危岩主控结构面端部区域的1#、4#和5#测点的主应变在所施加荷载逐渐增加的情况下,变化较大;2#和3#测点的主应变的变化较小。说明1#、4#和5#测点的主应力变化最为敏感,敏感程度1#>4#>5#>3#>2#;3#测点在整个过程中两个主应力方向上均处于受压状态。The excitation effect of unstable rock blocks is the change of tip stress of the main control structure surface. Focus on the transpression unstable rock,a laboratory model test for testing the excitation effect is build up. The stress condition of tip field of the main control structure can be indicated by two primary stresses and ,and five spots are assigned near the tip of main control structure surface,and the two primary stresses curve are measured in the whole test process~ The results show that, firstly, the 1#,4# and 5#： spot＇s primary stress changes observably as the exert load increase; the 2#; and 3# spot＇s primary stress changes little.It shows that 1#,4# and 5# spot＇s primary stress change are the most sensitive, and the degree of sensitivity is 1#〉4#〉5#〉3#〉2#;3# spot is under compression on two directions of two primary stresses.

关 键 词：危岩 主控结构面 主应变 模型试验 

分 类 号：P642.2[天文地球—工程地质学]