有效应力强度指标与总应力强度指标的关系

Relationship between effective stress intensity index and total stress intensity index

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。

When the soil specimens are ruptured the rupture angle ,which is obtained from the calculation using the total stress intensity index is not the real rupture angle.It is only a hypothetical rupture angle.Corresponding to the hypothetical rupture angle is the hypothetical shear rupture surface.According to the results of the tests,it is concluded that the real rupture angle is obtained from the calculation using the effective stress intensity index when the soil specimens are ruptured.It is analyzed and demonstrated that,in the shear strength calculation formula of the soil related,the effective stress intensity index and the total stress intensity index can not be confused.And in the formula,the effective stress intensity index should correspond to the effective stress;the total stress intensity index should correspond with the total stress.