周期荷载作用下红砂岩三轴疲劳变形特性试验研究  

TESTING STUDY ON FATIGUE DEFORMATION LAW OF RED-SANDSTONE UNDER TRIAXIAL COMPRESSION WITH CYCLIC LOADING

作　　者：章清叙[1] 葛修润[1] 黄铭[1] 孙红[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《岩石力学与工程学报》2006年第3期473-478,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(10172057)

摘　　要：为了解三向应力状态下周期荷载作用时红砂岩的疲劳变形特性,利用RMT–150B岩石力学多功能试验机,对红砂岩试件进行不同围压时静态应力–应变全过程试验和疲劳试验。试验结果表明:三轴周期荷载作用下红砂岩疲劳破坏时的变形量与应力上限(σ1-σ3)水平线在相应围压下的静态应力–应变全过程曲线峰后区对应的变形量相当;轴向不可逆变形发展呈现三阶段规律;三轴周期荷载的上限应力和幅值对疲劳破坏特性有显著影响。To explore the characteristics of fatigue deformation of red-sandstone under triaxial compression with cyclic loading, complete stress-strain tests under different confining pressures are performed with multi-function apparatus RMT - 150B. Testing result shows that the terminal strain corresponding to fatigue failure is equal to the one corresponding to the point that the post-peak stress-strain curve and the line of the maximum cyclic load（б1-б3） are intersected. The development of irreversible deformation shows a law of three stages. The maximum of cyclic load and amplitude have remarkable effects on fatigue failure of red-sandstone.

关 键 词：岩石力学 红砂岩 三轴压缩 周期荷载 疲劳 不可逆变形 应力-应变全过程曲线 

分 类 号：TU458[建筑科学—岩土工程]