端部约束对三轴排水剪试验影响的数值分析

针对三轴排水剪试验的端部约束问题,利用有限元软件ABAQUS模拟三轴排水剪试验,研究在不同的围压下,不同的端部约束条件对三轴排水剪试验软土剪切特性的影响。结果表明,端部完全光滑时,试样的整体应力应变关系能很好地代表材料本构模型;端部约束的存在导致了试样内部应力应变分布不均匀,约束程度越大,不均匀性越明显;小应变条件下,端部约束对于试样整体应力应变关系的影响并不大,而大应变条件下,端部约束的影响则不可忽视,约束程度不同影响程度一致。

Numerical Analysis of the Effects of the End Restraint on the Drained Triaxial Test

For the end restraint in the drained triaxial test,the program ABAQUS is used to simulate the drained triaxial test to study the effects of different end restraints on the behavior of soft soil under different confining pressures.The results show that without the end restraint,the stress-strain behavior of the specimen can well represent the constitutive model of soil.The end restraints lead to the non-uniformity of stress and strain in the specimen,and the greater the degree of end restraint is,the more obvious the inhomogeneity becomes.The effects of end constraint on the behavior of specimen is not great when the strain is small,but the effects under large strain condition can not be ignored,and the effects of different degrees of end restraint are the same.