基于循环加卸载的次加载面模型在岩石中的初步应用

发布时间：2018-04-02 04:13

本文选题：岩石力学　切入点：次加载面　出处：《岩石力学与工程学报》2015年10期

【摘要】：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。
[Abstract]:In order to simulate the deformation characteristics and corresponding stability of rock mass engineering under cyclic loading, the basic idea of subloading plane is introduced briefly. In order to consider the different strength characteristics of rock under triaxial compression and triaxial tension, That is, stress angle effect, a kind of corner model is introduced into the traditional Drucker-Prager yield criterion, and a modified Drucker-Prager yield criterion is formed. Based on this yield criterion, the secondary loading surface is combined. A sub-loading surface model suitable for cyclic loading and unloading of rock is proposed. Through parameter sensitivity analysis, it is found that the values of parameter U _ (C) and 蠂 ~ (2) in the model have a great effect on reflecting the rock's Mansin effect and ratchet effect. In order to verify the applicability and correctness of the model, the numerical simulation program is compared with the cyclic load test results of rock model materials and basalt. The results show that the model can well describe the dynamic deformation characteristics of rock. It shows that the subloading surface model based on cyclic loading and unloading can be applied to rock.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(2015CB057905) 国家自然科学基金项目集成项目(91215301);国家自然科学基金资助项目(11272331)
【分类号】：TU45

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