一种修正的Drucker-Prager屈服准则

发布时间：2018-03-09 13:02

本文选题：角隅模型　切入点：Drucker-Prager准则　出处：《岩土力学》2016年06期 　论文类型：期刊论文

【摘要】：Drucker-Prager(以下简称D-P)屈服准则因其形式简单、物理意义明确而得到广泛的应用,然而经过多年的应用和研究,其缺点逐渐显现出来,如拉剪区偏大、不具有应力角效应等,针对这些不足,提出了修正的D-P屈服准则。在拉剪区用圆球面和横截面的组合方式代替原来的圆锥面,从而不改变D-P屈服准则压剪区的形式,在考虑岩石实际的拉伸强度的同时,也满足该屈服准则经过单轴抗拉强度点的条件;为考虑岩石在三轴压缩和三轴拉伸状态下不同的强度特性,即应力角效应,引入了一种角隅模型;为保证屈服准则始终通过岩石的单轴抗压强度点,建议了一种材料参数k值的取值方法。为验证屈服准则修正后的适用性和正确性,将修正屈服准则与真三轴试验结果进行了拟合,同时与Mohr-Coulomb(以下简称M-C)准则进行对比,结果表明,修正屈服准则可以很好地描述试验现象,且比M-C准则更接近真实结果。
[Abstract]:Drucker-Prager yield criterion has been widely used because of its simple form and clear physical meaning. However, after many years of application and research, its shortcomings have gradually emerged, such as large tensile shear zone and no stress angle effect, etc. In order to overcome these shortcomings, a modified D-P yield criterion is proposed. In the tensile shear zone, the conical surface is replaced by the combination of the spherical plane and the cross section, so that the form of the D-P yield criterion compression shear zone is not changed. Considering the actual tensile strength of rock, the condition that the yield criterion passes through uniaxial tensile strength point is satisfied. In order to consider the different strength characteristics of rock under triaxial compression and triaxial tension, that is, stress angle effect, In order to ensure that the yield criterion always passes through the uniaxial compressive strength point of the rock, a method for determining the value of the material parameter k is proposed, and the applicability and correctness of the revised yield criterion are verified. The modified yield criterion is fitted to the true triaxial test results and compared with the Mohr-Coulomb criterion. The results show that the modified yield criterion can describe the experimental phenomena well and is closer to the real results than the M-C criterion.
【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;华北电力大学经济管理系;
【基金】：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) 国家重点基础研究发展计划(973)项目(No.2015CB057905)~~
【分类号】：TU45

【相似文献】