To investigate the drainage boundary influence on the strength characteristics of saturated clay, triaxial tests of saturated clay under undrainage, partial drainage, and complete drainage conditions are performed by using the GDS-DYNTTS apparatus. The partial drainage tests are conducted by controlling the strain increment ratio of the volume strain to axial strain as a constant value. The drainage boundary effects on the mechanical properties of the saturated clay are investigated considering the pore water pressure, effective stress path, and asymptotic behavior of the effective spherical stress-effective deviator stress plane. The asymptotic state constitutive equations are established by incorporating the strain increment ratio into the stress path constitutive model according to the asymptotic state and dilatancy characteristics of the saturated clay. The rationality of the model is verified by comparison with experimental results for the pore pressure and effective stress path. The experimental data show that the strain increment ratio of the saturated clay ratio should be less than 0.3. The drainage conditions affect the dilatancy of the normal consolidated clay, effective stress path, and shear strength of the clay. An increase in the strain increment ratio corresponds to a decrease in the pore water pressure and the effective stress ratio of the saturated low liquid-limit clay. The saturated clay specimen remains in a critical state for a long period of time when the axial strain of the specimen reaches 3%, and changes in the drainage condition can inhibit or accelerate soil failure.

中文翻译：

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局部排水条件下饱和低液限黏土的渐近状态模型

为了研究排水边界对饱和黏土强度特性的影响，使用GDS-DYNTTS设备对不排水，部分排水和完全排水条件下的饱和黏土进行了三轴试验。通过将体积应变与轴向应变的应变增量比控制为恒定值来进行部分排水测试。考虑孔隙水压力，有效应力路径和有效球形应力-有效偏应力面的渐近行为，研究了排水边界对饱和黏土力学性能的影响。根据饱和黏土的渐近状态和剪胀特性，通过将应变增加率纳入应力路径本构模型，建立渐近状态本构方程。通过与孔隙压力和有效应力路径的实验结果进行比较，验证了模型的合理性。实验数据表明，饱和黏土比的应变增量比应小于0.3。排水条件会影响正常固结粘土的膨胀率，有效应力路径和粘土的剪切强度。应变增量比的增加对应于饱和低液限粘土的孔隙水压力和有效应力比的降低。