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利用英国GDS公司的STDTTS标准应力路径三轴仪开展了饱和砂土的部分排水试验,从超静孔隙水压力、有效应力路径与渐近状态特性等方面研究了部分排水条件下饱和砂土的力学特性。将渐近状态方程与剪胀方程耦合,并引入描述排水程度的状态参量,提出了相变应力比方程,将方程引入到土的应力路径本构模型,建立了饱和砂土的渐近状态本构模型。通过部分排水条件下饱和砂土的三轴试验结果,验证了所建模型的合理性。研究结果表明:排水条件控制着土体剪胀特性的发挥程度,进而从两个方面影响土的力学特性,一是荷载条件,即影响土体的有效应力路径,以及加载模式;二是土性条件,即影响土的抗剪强度的发挥程度,形成渐近状态。
The partial discharge test of saturated sand was carried out by STDTTS standard stress path triaxial apparatus of British GDS company. The mechanics of saturated sand under partial drainage was studied from the characteristics of excess pore water pressure, effective stress path and asymptotic behavior. characteristic. The asymptotic equation is coupled with the dilatancy equation, and the state parameter describing the degree of drainage is introduced. The phase transformation stress ratio equation is proposed, and the equation is introduced into the constitutive model of soil stress path. The asymptotic behavior of saturated sand Model. Through the triaxial test of saturated sand under partial drainage conditions, the rationality of the model is verified. The results show that the drainage conditions control the degree of soil dilatancy, and affect the mechanical properties of soil in two aspects. The first is the loading condition, which is the effective stress path affecting the soil and the loading mode. The second is the soil Conditions, that affect soil exertion of shear strength, the formation of asymptotic state.