CAJ | 학술논문

岩石的残余强度是岩石力学的重要指标，准确地评价岩石残余强度对于评价地下工程的稳定性以及优化岩体支护设计具有重要意义。基于岩石的三轴力学特性提出一种表征岩石峰后强度衰减行为的力学指标——岩石强度衰减系数，该指标可反映岩石的脆性程度，并提出岩石强度衰减系数与围压关系的幂函数模型。对22组不同成因的岩石常规三轴压缩试验数据进行幂函数模型参数拟合，发现不同岩石拟合所得参数离散性较大，分析其原因主要与岩石矿物组成和岩石结构特征等因素相关。在此基础上提出基于强度衰减方法确定岩石残余强度的方法，分析表明，该方法能够很好地拟合岩石残余强度试验数据，并能反映岩石结构性质对残余强度的影响。
암석적잔여강도시암석역학적중요지표，준학지평개암석잔여강도대우평개지하공정적은정성이급우화암체지호설계구유중요의의。기우암석적삼축역학특성제출일충표정암석봉후강도쇠감행위적역학지표——암석강도쇠감계수，해지표가반영암석적취성정도，병제출암석강도쇠감계수여위압관계적멱함수모형。대22조불동성인적암석상규삼축압축시험수거진행멱함수모형삼수의합，발현불동암석의합소득삼수리산성교대，분석기원인주요여암석광물조성화암석결구특정등인소상관。재차기출상제출기우강도쇠감방법학정암석잔여강도적방법，분석표명，해방법능구흔호지의합암석잔여강도시험수거，병능반영암석결구성질대잔여강도적영향。
Residual strength of rocks is an important parameter in rock mechanics, because it has a significant influence on accurately evaluating stability of underground excavations and optimizing design of rock mass support. Based on triaxial mechanical properties of the rock, an index, defined as the strength degradation coefficient, is proposed to describe the post-peak strength degradation of rock. In this paper, the index is in essence a brittle index for rocks. A power model is then proposed for the relationship between the strength degradation coefficient and the confinement stress. By fitting the data from 22 lab triaxial compression tests, it is found that the parameters in the model which are different in various rocks can be mainly related to the mineralogical composition and the structure of rocks. Furthermore, a strength degradation method based model is proposed for determining the residual strength of rocks. It is found that the proposed model fits triaxial compression test data of rocks better than the classical Mohr-Coulomb failure criterion does. Meanwhile, it can reflect the influence of structural properties on the residual strength of rocks.