基于修正Drucker-Prager准则的岩石次加载面模型

发布时间：2018-03-09 02:10

本文选题：应力角效应　切入点：拉剪区　出处：《岩土力学》2017年02期 　论文类型：期刊论文

【摘要】：为模拟岩石在循环加、卸载作用下的变形特性,结合Drucker-Prager(简称D-P)屈服准则与次加载面理论,建立了能考虑岩石材料实际抗拉强度和应力角效应的循环加、卸载模型。首先考虑岩石在三轴压缩和在三轴拉伸状态下不同的强度特性,在传统的D-P屈服准则中引入角隅模型,并借鉴殷有泉提出的D-P-Y准则,形成了修正的D-P屈服准则;进一步结合修正屈服准则和次加载面理论,提出了适用于岩石循环加、卸载的次加载面模型,并通过自编程序,实现了循环加、卸载模型的数值表达与岩石循环加、卸载试验数值仿真。计算结果表明,基于修正D-P屈服准则的次加载面模型能较好地描述岩石的曼辛效应和棘轮效应;通过改变抗拉强度的大小,可以发现随着抗拉强度的减小,岩石的变形量相应增加,且增加的幅度逐渐提高,说明修正模型可准确反映抗拉强度对岩石的循环加、卸载变形的影响。
[Abstract]:In order to simulate the deformation characteristics of rock under cyclic loading and unloading, combined with Drucker-Pragerian yield criterion and subloading surface theory, a cyclic loading method considering the actual tensile strength and stress angle effect of rock material is established. Unloading model. Firstly, considering the different strength characteristics of rock under triaxial compression and triaxial tension, the corner model is introduced into the traditional D-P yield criterion, and the modified D-P yield criterion is formed by referring to the D-P-Y criterion proposed by Yin Youquan. Furthermore, combined with the modified yield criterion and the theory of subloading surface, a subloading surface model suitable for cyclic loading and unloading of rock is proposed. The numerical expression of cyclic loading and unloading model and cyclic loading of rock are realized by self-programming. Numerical simulation of unloading test. The results show that the subloading surface model based on modified D-P yield criterion can better describe the Mansin effect and ratchet effect of rock, and by changing the magnitude of tensile strength, it can be found that the tensile strength decreases with the decrease of tensile strength. The amount of deformation of rock increases correspondingly and the amplitude of increase increases gradually. It shows that the modified model can accurately reflect the effect of tensile strength on cyclic loading and unloading deformation of 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(No.2015CB057905) 国家自然科学基金项目集成项目(No.91215301);国家自然科学基金资助项目(No.11272331)~~
【分类号】：TU45

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