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岩石强度准则的研究一般着重于抗压强度而忽略抗拉强度,抗拉强度是岩石的一个重要力学性质,在工程设计中是一个重要的力学参数。该论文采用五种岩石的室内岩石力学试验数据对四种强度准则进行拟合,以对抗拉强度的描述精度、最小平均标准拟合差和拟合的主应力间关系曲线综合评价强度准则与试验值的吻合性,探究不同的强度准则对抗拉强度的预测效果。分析表明:指数强度准则拟合值与试验值最接近,描述精度最好,评价不同应力状态下岩石的强度特征优先考虑指数强度准则。
The research on rock strength criterion generally focuses on compressive strength and neglects the tensile strength, which is an important mechanical property of rock and is an important mechanical parameter in engineering design. In this paper, four kinds of strength criteria are fitted by indoor rock mechanics test data of five kinds of rock to describe the accuracy of the tensile strength, the curve of the minimum average standard fit and the fitted principal stress comprehensively evaluate the strength criterion and test Value of consistency, explore the different strength criteria on the tensile strength of the prediction effect. The analysis shows that the fit of index strength criterion is the closest to the experimental value, and the description precision is the best. The strength characteristics of rock under different stress states are given priority to the index strength criterion.