State-dependant dilatancy in critical-state constitutive modelling of sand
State-dependant dilatancy in critical-state constitutive modelling of sand
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DOI：
10.1139/t99-029
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发表时间：
1999-11
影响因子：
3.6
通讯作者：
X. S. Li;Y. Dafalias;Zhi-Liang Wang
中科院分区：
文献类型：
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作者：
X. S. Li;Y. Dafalias;Zhi-Liang Wang
对边界面亚塑性模型进行了修改，以纳入临界状态土力学的基本前提，并涵盖密砂和松散砂的行为。修改包括将相变线呈现为状态参数的函数，该状态参数测量相同 p 值下的当前空隙率和临界空隙率之间的差异，使得当状态参数为零时，相变线变得与 q-p 空间中的临界状态线相同。因此，膨胀取决于状态，在临界状态下产生零值。这种依赖性允许对沙子在松散或致密状态下或从一种状态到另一种状态的转变中的响应进行真实的建模。模型模拟与排水、不排水、单调和循环加载条件下的一系列实验结果之间的比较表明，所提出的概念和建模技术在广泛的密度和限制条件下有效工作...
A bounding-surface hypoplasticity model is modified to incorporate the basic premises of critical-state soil mechanics and cover both dense and loose sand behavior. The modification consists of rendering the phase-transformation line a function of the state parameter, which measures the difference between the current and critical void ratios at the same value of p, such that when the state parameter is zero, the phase-transformation line becomes identical to the critical-state line in q-p space. As a result the dilatancy depends on the state in a way that yields a zero value at critical state. This dependence allows a realistic modelling of the response of a sand in either loose or dense state, or in the transition from one state to another state. A comparison between model simulations and a sequence of experimental results for drained, undrained, monotonic, and cyclic loading conditions shows that the proposed concept and modelling technique work effectively over a wide range of densities and confining p...