循环荷载下岩石塑性应变演化模型

为了准确评估岩石工程在周期性荷载作用下的长期稳定性和安全性，对岩石的循环疲劳塑性应变理论进行了研究。将岩石在循环荷载下的疲劳损伤变量方程，引入累积塑性应变方程中，通过积分变换，推导出高周和低周疲劳循环条件下岩石轴向塑性应变的演化方程；将塑性应变发展理论模型与前人疲劳试验结果进行了比较。结果表明，该模型较好地反映了岩石的轴向塑性应变演化规律，可直接用于疲劳荷载作用下岩石工程作用机理数值分析中。

Evolution model of rock plastic strain under cyclic loading

The fatigue failure property of the rock under the cyclic load is one of the important factors that influence the long term stability and safety of the geotechnical engineering. Much analysis has been made of the fatigue damage variable while little research made of the model of plastic strain evolution. The fatigue damage variable equation for the rock under the cyclic load was substituted into the accumulated plastic strain equation. By means of integral transformation, the evolution equations of the axial plastic strain under high and low cyclic fatigue were derived. The theoretical evolution models of the plastic strain damage were compared with the previous fatigue tests. The results indicated that the established model reflects the evolutional law of the axial plastic strain of the rock under cyclic loading, and can be directly applied to numerical analysis for rock engineering.