一维高应力及重复冲击共同作用下岩石的本构模型

CONSTITUTIVE MODEL OF ROCK UNDER ONE-DIMENSIONAL HIGH STRESS AND REPEATED IMPACT LOADING

阐述一维高应力及重复冲击共同作用下岩石的本构模型研究的意义。采用组合模型研究方法,将岩石单元看成一个弹性元件和一个黏性元件串联后与损伤体Da1并联,最后与损伤体Da2串联,构成岩石单元组合体力学模型,推出一维高应力及重复冲击共同作用下岩石的本构方程。针对建立的本构模型,设计矽卡岩、蛇纹岩在一维高应力及重复冲击共同作用下的岩石力学试验,试验结果得出,峰值应力前动态应力–应变曲线变化的趋势一致,没有压密阶段,仅有弹性阶段、非线性变形阶段,峰值应力后出现回弹、不回弹2种现象。借助试验结果对建立的本构模型进行验证,结果表明建立的本构方程的拟合曲线和试验曲线具有很好的一致性。

The significance of study on constitutive model of rock under one-dimensional high stress and repeated impact loading was expounded. By the research methods of combination model,rock may be regarded as an elastic element and a cohesive element in series,then with a damage mass Da1 parallel,then with a damage mass Da2 in series,forming a rock combination mechanical model. Then,the constitutive model equation of rock under one-dimensional high stress and repeat impact loading was elucidated. The rock mechanical test of skarn and serpentine under one-dimensional high stress and repeated impact loading was designed. The test results show that before the peak stress,the trends of dynamic stress-strain curve is consistent,without pressure dense phase,only the elastic stage and nonlinear deformation stage. There are two phenomena after the peak stress,one is rebound phenomenon,and the other is not rebound. By comparison between the test results and the theoretical results,it is shown that there is a good coherence between theoretical stress-strain curves and experimental stress-strain curves.