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通过扰动的粉质黏土室内固结排水卸载剪切试验,分别得到真三轴和普通三轴侧向卸载条件下的应力-应变曲线。对这些曲线分析可知,它们表现为应变硬化和非线性,其初始阶段呈直线状,很快转变为曲线;真三轴试验(轴向应力σ1为常量、减围压σ3、保持应变ε2=0)相比普通三轴试验(σ1为常量、减σ3,且中主应力σ2=σ3),真三轴试验屈服发生在应力差(σ1-σ3)值较高、轴向应变值ε1较小处;将试验取得的各屈服点进行整理分析,认为这种土在卸载条件下的屈服表现较适宜于Matsuo-Nakai屈服强度准则。
The stress-strain curve under true uniaxial and common triaxial lateral unloading conditions was obtained by disturbed silty clay indoor consolidation drainage unloading shear test. The analysis of these curves shows that they behave as strain hardening and non-linearity. The initial stage is linear and quickly changes to a curve. The true triaxial test (axial stress σ1 is constant, minus the confining pressure σ3 and holding strain ε2 = 0 ) Compared with ordinary triaxial test (σ1 is constant, minus σ3, and the main principal stress σ2 = σ3), the true triaxial test yield occurs when the stress difference (σ1-σ3) is high and the axial strain ε1 is small The yield points obtained from the test were analyzed and concluded that the yield performance of this soil under unloading conditions is more suitable for the Matsuo-Nakai yield strength criterion.