作　　者： ; ; ; ;

机构地区： 大连理工大学水利土木学院

出　　处： 《岩土力学》 2007年第9期1978-1982,1986,共6页

摘　　要： 在岩石破裂过程分析(RFPA2D)系统的基础上,考虑岩石损伤过程的时间因素影响,引入岩石细观单元蠕变本构方程,建立了考虑流变效应的岩石破裂过程RFPA2D数值模型。应用该模型模拟了恒定荷载作用下岩石的蠕变破坏过程,得到了岩石蠕变破裂的3个典型阶段:初始蠕变阶段、稳定蠕变阶段和加速蠕变阶段,模拟结果同实验室试验所观察到的现象十分吻合。这表明考虑流变效应的RFPA2D数值模型适用于模拟岩石的蠕变破坏这一复杂的、非线性演化问题。此外,数值模拟还揭示了岩石的宏观蠕变破坏实质上是细观层次上单元损伤累计的结果,这些结论对岩石工程的长期稳定性研究具有重要的理论指导和实践意义。 On the basis of rock failure process analysis（RFPA）code,together with the time-dependence of the rock progressive damage and the creep constitutive relation of the characteristic elements at a mesoscopic scale,the rheological model of rock in the failure process under loading is further developed.Using the further developed RFPA code,the progressive creep failure of rock specimens under constant loading was numerically simulated and the typical time-dependent deformations： the transient creep,the steady-state creep and the accelerating creep were also represented.The fact that the simulations are well tallied with the observations in laboratory shows that the rheological model is appropriate to investigate the nonlinear complicated creep failure of rocks.The numerical simulations indicate that the macroscopic creep failure is induced by clusters of microfracturing at a meso scale.The above numerical results offer us some important theoretical indications and practical instructions to further investigate the instability failure mechanisms of engineering rockmass and take some precautions to prevent their occurrences of rock hazards in rock engineering.

关 键 词： 岩石 破裂过程 蠕变 单轴压缩 数值模拟

领　　域： [建筑科学] [建筑科学]