砂土的剪胀理论及其本构模型的发展

Development of dilatancy theory and constitutive model of sand

经典的应力剪胀理论被广泛应用于土体弹塑性本构模型的建立,较好地模拟了黏性土的变形特性。最新的研究表明:由于应力剪胀理论中忽略了土体内部状态参量对剪胀的影响,而使得该理论应用于砂土时发生了困难。近来一些学者纷纷将土的密度作为变量引入剪胀方程,提出了状态相关剪胀理论,成功地模拟了砂土的各种变形特性。本文就砂土的状态及其描述、剪胀理论的发展、砂土本构模拟等方面进行介绍。

Traditional stress dilatancy theory had been extensively used in constitutive modeling, and its application to clay was very successful. However it was found that this theory was not suitable for sand modeling due to the ignorance of internal state variable of materials in the definition of dilatancy equation. This problem had been recognized by some researchers in recent years, and some variables related to material state were combined into the dilatancy equation. The so called state-dependent dilatancy theory was suggested and applied in sand modeling. In this paper, the description of sand state, the development of dilatancy theory and constitutive modeling of sand behavior were introduced.