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本文讨论了常用三轴压缩试验中应力应变条件对抗剪强度的影响,又讨论了常用三轴压缩试验中破坏标准的选择。在常用三轴排水压缩试验中应力差和应力比两种基本破坏标准是一致的,即应力差最大值与应力比最大值在同一应变时达到。在固结不排水压缩试验中应力差最大值出现在应力比最大值之前、之后或在同一应变处。故在固结不排水或不排水试验中,两种破坏标准应同时采用,取其低值,用于实际工程计算,关于设计指标的选用,应考虑强度的发挥度或工作应力,裂隙岩石的设计指标选择,应考虑二维连通比。
This paper discusses the effect of stress and strain conditions on shear strength in commonly used triaxial compression tests, and discusses the choice of failure criteria in commonly used triaxial compression tests. In the commonly used triaxial drainage compression test, stress difference and stress ratio are consistent with the two basic failure criteria, ie, the maximum stress difference and the maximum stress ratio are achieved at the same strain. The maximum stress difference in the consolidated undrained compression test occurs before, after, or at the same strain as the stress ratio maximum. Therefore, in the consolidated undrained or undrained test, the two failure criteria should be adopted at the same time, and their low values should be taken into account for practical engineering calculations. Regarding the selection of design indicators, the degree of strength or work stress should be taken into account. For design index selection, two-dimensional connectivity ratios should be considered.