非线性Mohr-Coulomb准则适用范围及其改进研究

发布时间：2018-03-02 05:19

本文关键词： Mohr-Coulomb准则非线性修正岩石临界状态适用范围指数型准则　出处：《岩土力学》2016年03期 　论文类型：期刊论文

【摘要】：SINGH M为克服(Mohr-Coulomb M-C)准则只能线性表征岩石强度随围压变化这一局限性,在M-C准则的基础上添加一个修正项对其进行改进,提出非线性M-C准则。该准则认为,岩石在围压达到其单轴抗压强度时岩石就进入临界状态,此观点与部分岩石的试验结果有较大的出入,使得该准则的适用范围受到影响。为拓宽非线性M-C准则的适用范围,通过对其修正项的进一步改进,提出M-C准则修正一般表达式。应用11种岩石三轴试验数据对M-C准则修正一般表达式、非线性M-C准则和目前岩石力学界认为较好的双曲线型准则的精度进行比较,结果显示,M-C准则修正一般表达式对岩石三轴强度的拟合精度高于其他两种准则,且由岩石三轴试验强度的一致性更好。证明M-C准则修正一般表达式优于非线性M-C准则,且适用范围更广。
[Abstract]:SINGH M (Mohr-Coulomb M-C) to overcome the criterion only linear representation of rock strength with confining pressure change of this limitation, adding a correction term to improve it based on M-C criterion, the proposed nonlinear M-C criterion. The criterion that rock under confining pressure reaches the uniaxial compressive strength of rock will enter the critical state test this view and part of the rock results is quite different, the scope of the guidelines is affected. Widen the scope of application of nonlinear M-C criterion, through further improvement of the amendment, proposed M-C criterion modification general expressions. The application of 11 kinds of rock three triaxial test data correction general expression of the M-C criterion nonlinear M-C criterion and the rock mechanics field that hyperbolic criterion better accuracy by comparing results show that the modified M-C criterion expression fitting precision of three axis high strength rock In the other two criteria, and the consistency of rock three axis test is better. It is proved that the general expression of M-C criterion is better than that of nonlinear M-C criterion, and its application scope is wider.

【作者单位】：武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室;中钢集团武汉安全环保研究院;
【基金】：国家自然科学基金资助项目(No.51074115) 湖北省自然科学基金重点项目(No.2015CFA142)~~
【分类号】：TU45

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