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对实验室常规三轴试验分别进行了二维和三维的离散元数值试验,从试样宏观力学响应和剪切带演化的角度比较模拟结果,分析模型维数对岩土力学性质模拟结果的影响。数值试验结果表明,最密实状态的、具有相同参数的二维和三维试样,在剪切过程中均会表现出软化特性,试样峰值应力均随围压的提高而增大,其峰值应力的数值相近,但三维数值试样达到峰值应力所对应的应变约为二维试样的1/4。随着围压的增大,二维和和三维离散元数值试样剪切带均趋于集中;但在相同围压作用下,不同维数数值试样宏观剪切带的形状和厚度均不同,二维试样剪切带的范围和厚度均较大。
The two-dimensional and three-dimensional discrete element numerical tests were carried out on the conventional triaxial tests in the laboratory. The simulation results were compared from the macroscopic mechanical response and the shear band evolution of the samples, and the influence of the dimension of the model on the simulation results of the geotechnical properties was analyzed . The numerical results show that the most compact two-dimensional and three-dimensional specimens with the same parameters show softening behavior during the shearing process. The peak stress increases with the increase of confining pressure and the peak stress However, the peak strain of three-dimensional numerical sample corresponds to about 1/4 of the two-dimensional sample. With the increase of confining pressure, the shear bands of two-dimensional and three-dimensional discrete element numerical samples tend to concentrate. However, under the same confining pressure, the shape and thickness of macroscopic shear bands of different-dimensional numerical samples are different , Two-dimensional specimen shear zone with larger thickness and range.