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岩石多轴与常规三轴强度的关系

ISSN号：0254-7805
期刊名称：固体力学学报
时间：2011
页码：228-234
分类：TU411.7[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]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,武汉430071
相关基金：国家重点基础研究发展规划（973）项目（2010CB732006）; 国家自然科学基金项目（51079144 50979104）资助
相关项目：高应力下硬岩岩芯饼化机制、信息解译与工程应用

关键词：中间主应力效应, 真三轴试验, Mohr-Coulomb准则, 多轴强度准则, 中间主应力效应系数, intermediate principle stress dependence effect, true triaxial test, Mohr-Coulomb criterion, polyaxial strength criterion, coefficient of the intermediate principal stress effect

中文摘要：

在各向异性应力状态下,岩石强度的中间主应力效应已被很多的试验所证实.基于真三轴试验结果和多轴强度准则,研究了同一中间主应力系数下岩石的多轴强度与常规三轴强度之间的关系.结果表明,在相同的中间主应力系数下,岩石的多轴与常规三轴的强度曲线具有相同的形式.对于常规三轴强度特征符合Mohr-Cou-lomb准则的岩石,中间主应力对岩石强度中的粘结效应影响明显,随着中间主应力系数的增大,粘结效应先增大而后降低;而其对岩石内摩擦效应的影响甚微,可以忽略.不同岩石多轴强度中间主应力效应的强弱主要取决于该种岩石的内摩擦角,内摩擦角越大,其中间主应力效应越强烈.研究还表明,在已知中间主应力效应函数的前提下,可采用岩石常规三轴的强度参数直接作为其多轴强度准则的参数,这对于解决众多工程因缺乏真三轴试验数据而无法应用多轴强度准则的问题具有重要的意义.

英文摘要：

In the anisotropic stress condition,the existence of the intermediate principle stress effect on the strength of rock has been verified by a large number of true triaxial tests of rock.Based on the true triaxial test data and the polyaxial strength criterions,the relationship between the polyaxial strength and conventional triaxial strength of rock at the same intermediate principle stress coefficient was studied in this paper.The results indicated that the same function of the polyaxial strength curves with the conventional triaxial strength curves could be obtained at the same intermediate principle stress coefficient.For the rock types of which the strength features can be described by the Mohr-Coulomb criterion,the influence on the cohesion action in the polyaxial strength of rock is remarkable.The cohesion action will increase firstly and then decrease with the growth of the intermediate principle stress coefficient which hardly influences the friction action of rock.The strength effect of different rock types is controlled by the corresponding angle of internal friction.The larger the internal friction angle is,the stronger this effect is.The results also indicated that the strength parameters obtained by the conventional triaxial tests can be applied in the polyaxial strength criterion after the intermediate principle stress effect function has been obtained.It will be of the important value for the application of polyaxial strength criterions in the stability analysis of rock engineerings lacking true triaxial test data.

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