周期荷载作用下红砂岩三轴疲劳变形特性试验研究 - 岩石力学与工程学报.PDF

第 25 卷 第 3 期 岩石力学与工程学报 Vol.25 No.3 2006 年 3 月 Chinese Journal of Rock Mechanics and Engineering March ，2006 周期荷载作用下红砂岩三轴疲劳变形特性 试验研究 章清叙，葛修润，黄 铭，孙 红 (上海交通大学 船舶海洋与建筑工程学院，上海 200240) 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(σ －σ)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 1 3 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。 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 中图分类号：TU 458 文献标识码：A 文章编号：1000 –6915(2006)03 –0473 –06 TESTING STUDY ON FATIGUE DEFORMATION LAW OF RED-SANDSTONE UNDER TRIAXIAL COMPRESSION WITH CYCLIC LOADING ZHANG Qing-xu ，GE Xiu-run，HUANG Ming ，SUN Hong (School of Naval Architecture ，Ocean and Civil Engineering，Shanghai Jiaotong University ，Shanghai 200240 ，China) Abstract ：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(σ － 1 σ) are intersected. The development of irreversible deformation shows a law of three stages. The maximum of 3 cyclic load and amplitude have remarkable effects on fatigue failure of red-sandstone. Key words ：rock mechanics ；red-sandstone ；triaxial compression ；cyclic load ；fatigue；irreversible de