基于统计理论的岩石动态损伤本构模型研究

抓住岩石微元强度具有统计规律的特点，将岩石微元体抽象为弹性损伤体与各向同性粘性体的并联体，根据岩石在动态荷载作用下的受力特点，建立了岩石动态统计损伤本构模型。与以往动态本构模型相比，该模型参数少，便于工程应用，并能考虑动载方向以及围压对岩石变形特性的影响，同时，对岩石破坏过程的峰后曲线亦有较好的描述。结合室内三轴试验对模型的可行性进行了验证，结果表明，计算值与试验数据吻合较好，能满足工程应用的需要。

Research on Damage Constitutive Model of Rock Under Dynamical Load Based on Statistical Theory

Firstly,based on the statistical character of strength,rock micro-unit was abstracted into the parallel connection of elastic damage body and viscous body,and then a new statistical damage constitutive model of rock under dynamical load is deduced according to the working character of rock under dynamical load.Compared to the normal methods,the new model has relative had less parameters and is simple and easy to application,and can consider the influence of surrounding pressure to deformation characteristic of rock,even can depict the curve after crest point of rock failure proceeding perfectly.Combined with laboratory thri-axial test,the calculated results and measured data are in an good agreement.