摘要
利用RMT-150C型岩石力学多功能试验机,进行了盐岩单轴循环荷载作用下的疲劳试验,研究了盐岩的疲劳强度、变形及损伤特性。试验结果表明,当上限应力大于"门槛值"时,盐岩疲劳破坏时的轴向应变可以分为初始变形、等速变形和加速变形3个阶段,呈疏-密-疏的发展过程。改变上限应力和平均应力会显著影响疲劳的进程,提高上限应力值和平均应力值,初始轴向变形和循环轴向变形的比率都会提高,疲劳破坏时的总循环次数显著减小。盐岩疲劳破坏终点的变形量同样受静态轴向应力-应变全过程曲线的控制,控制误差范围在10%左右。循环荷载作用下,盐岩的变形模量经历了一个先逐渐增加,后缓慢降低,最后加速减小的过程。对循环荷载作用下盐岩疲劳损伤演化规律进行了初步探讨。
Testing study is made on the strength,deformation and fatigue damage process of salt rock under uniaxial compression condition by the rock mechanics test equipment RMT-150C.The results indicate that when the maximum of cyclic load is above ＂threshold value＂,the fatigue axial deformation can be divided into three stages： initial deformation,constant velocity deformation and accelerating deformation.Changing the maximum and average cyclic load,can affect the process of fatigue failure obviously;the initial axial deformation and cyclic axial deformation ratio will be increased;the total cyclic numbers reduced,while increasing the maximum of cyclic load and average cyclic load.Testing results show that the fatigue failure curve of salt rock is also controlled by complete stress-strain curve under static loading;the error is controlled under 10 percent.The deformation module of salt rock also can be divided into three stages： first,deformation modulus increasing;second,deformation modulus is in slightly decreasing trend;third,deformation modulus decreasing sharply.The damage development and deformation law of salt rock under cyclic loading are analyzed.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第5期1353-1359,共7页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.50904062)
国家重点基础研究发展规划(973)(No.2009CB724603
No.2010CB226701)
