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剪胀性是土特有的一种材料属性,而准确地描述砂土的剪胀性则是建立砂土本构模型的重要基础。大量常规三轴试验发现,在以相同加载条件下剪切时密砂和松砂会表现出完全不同的剪胀性和应力-应变关系特性,说明砂土的剪胀性不仅与其所处的应力状态有关,也与其物理状态相关。状态参量理论很好地解释了砂土所处应力状态和物理状态对剪胀性的共同作用。空心扭剪三轴试验仪可以实现不同主应力方向的单调剪切试验。试验结果表明,当砂土以不同主应力方向单调剪切时,即使处于相同初始应力条件和物理状态,砂土也会表现出不同的剪胀性,说明了主应力方向也是决定砂土剪胀性的重要条件。本文通过分析试验中主应力方向对砂土剪胀性的影响,提出了一个含有主应力方向的状态参量,并建立了相应的剪胀方程。通过与试验数据的对比,验证了该方法的正确性和准确性。
Shear dilatancy is a material property unique to earth, and accurately describing the dilatancy of sand is an important foundation for the constitutive model of sand. A large number of conventional triaxial tests have found that sand and loose sand show completely different characteristics of dilatancy and stress-strain when sheared under the same loading conditions, indicating that the dilatancy of sand is not only related to the stress The state is also related to its physical state. The state parameter theory well accounts for the synergistic effect of the stress and physical state of the sand on dilatancy. Hollow torsional shear triaxial test instrument can achieve different direction of the monotonic principal stress shear test. The results show that when the sand is monotonically sheared in different principal stress directions, the sand will show different dilatancy even under the same initial stress conditions and physical conditions, indicating that the principal stress direction is also the dilatancy of sand Important condition of sex. In this paper, by analyzing the influence of main stress direction on the dilatancy of sand, a state parameter containing the direction of principal stress is proposed and the corresponding dilatancy equation is established. By comparing with experimental data, the correctness and accuracy of this method are verified.