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由总应力强度指标计算的αf,并不是试样破坏时的真实破裂角,而仅是一个假想的破裂角,与之对应的平面是一个假想的剪切破坏面。试验结果表明,试样破坏时的真实破裂角,是用有效应力强度指标φ′计算的αf′。分析论证了在关于土的抗剪强度计算的相关公式中,有效应力强度指标与总应力强度指标不可混用,且公式中有效应力强度指标应与有效应力相对应、总应力强度指标应与总应力相对应。
The value of αf calculated from the total stress intensity index is not the true crack angle at the time of specimen failure but only an imaginary rupture angle. The corresponding plane is an imaginary shear failure plane. The test results show that the true rupture angle at failure of the specimen is αf ’calculated from the effective stress intensity index φ’. It is proved that the effective stress intensity index is not mixed with the total stress intensity index in the formula of calculating the shear strength of soil, and the effective stress intensity index in the formula should correspond to the effective stress. The total stress intensity index should be related to the total stress Corresponding.