Study on the Time Dependent Bihavior of Rocks in a Post Failure Region

本课题取得的主要成果如下：1。破坏后区域岩石的测试方法已经有了！成立如下：采用位移控制的三轴压缩试验系统，岩石试样在破坏后保持稳定。破坏后区域岩石的试验可以应用于这种条件下的试样。在三维应力状态下的时间依赖行为由传统的单轴应力状态下建立的模型来表示，使用归一化应力应变差。破坏后区域岩石的行为在一定程度上可以表示为连续介质，忽略了破坏模式的差异。破坏后区域岩石的行为可以用带有滑块的Burger模型来表示。破坏后区域岩石的残余强度也取决于应变速率。破坏后区域岩石的蠕变行为可以用带滑块的Burger模型来估计。

Main results obtained in this project are following.1. The testing method for rocks in the post failure region has beer! established as follows. Using the displacement controlled triaxial compression testing system, the rock specimen is kept stable just after the failure. Tests for rocks in the post failure region can be applied to the specimens in this condition.2. Time dependent behaviors in the 3 dimensional stress state are represented by the tradisional models developed in the uniaxial stress state, using the normalized differential stress and strain.3. The behavior of rocks in the post failure region can be represent as a continum media to some extent, neglecting the difference of failure mode.4. The behavior of rocks in the post failure region can be represent by the Burger's Model with the slider.5. The residual strength of rocks in the post failure region depends on the strain rate also.6. The creep behavior of rocks in the post failure region can be estimated by Burger's Model with the slider.