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为模拟岩体工程在循环荷载作用下的变形特性及相应的稳定性,简要地介绍了次加载面的基本思想。为考虑岩石在三轴压缩状态下和在三轴拉伸状态下不同的强度特性,即应力角效应,在传统的Drucker-Prager屈服准则中引入一种角隅模型,从而形成了修正的Drucker-Prager屈服准则,基于该屈服准则,结合次加载面,提出适用于岩石循环加卸载的次加载面模型。通过参数敏感性分析,发现模型中参数u,C和χ的取值对反映岩石曼辛效应、棘轮效应的影响很大;为验证该模型的适用性和正确性,通过自编程序的数值模拟与岩石模型材料和玄武岩的循环荷载试验结果进行对比,结果表明该模型可以很好地描述岩石的动力变形特性,说明基于循环加卸载的次加载面模型可以运用到岩石中。
In order to simulate the deformation characteristics and the corresponding stability of rock mass under cyclic loading, the basic idea of sub-loading surface is briefly introduced. In order to consider the different strength characteristics of rock under triaxial compression and triaxial tensile conditions, namely stress angle effect, a corner model is introduced into the traditional Drucker-Prager yield criterion to form a modified Drucker- Prager yield criterion, based on the yield criterion, combined with the sub-loading surface, proposed sub-loading surface model suitable for rock loading and unloading. Through the parameter sensitivity analysis, it is found that the values of u, C and χ in the model have a great influence on reflecting the Manning effect of rock and the ratcheting effect. To validate the applicability and accuracy of the model, Compared with the results of cyclic loading test of rock model material and basalt, the results show that the model can well describe the dynamic deformation characteristics of rock, indicating that subloading surface model based on cyclic loading and unloading can be applied to rock.