同时，给出了不同条件下密集颗粒样本的生成方法，分析了边界应力、初始构型、加载速率、粒子间的摩擦系数等对颗粒系统目标构型的影响。
The influences of boundary stress, initial configuration, loading rate and friction coefficient between particles on the state and configuration of dense granular system are also examined.
试验结果表明，起动水力梯度和破坏水力梯度都随着围压的增大而增大，是由于增大围压使得颗粒间的摩擦力增大的结果。
It is found that both the initiation hydraulic gradient and the failure hydraulic gradient increase with confining pressure. This is mainly due to the increase of friction between particles.
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