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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Bounding surface plasticity model for liquefaction of sand with various densities and initial stress conditions
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Bounding surface plasticity model for liquefaction of sand with various densities and initial stress conditions

机译：不同密度和初始应力条件下砂土液化的有界表面可塑性模型

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A comprehensive data package of cyclic simple shear tests was used to critically check and revise a plasticity model for sand. These cyclic simple shear tests were performed using Monterey No. 0/30 sand with different relative densities and under complex loading conditions including asymmetrical cyclic loading with various initial shear stresses and overburden pressures. The newly revised model carries several novel concepts: using a strain increment dependent flow rule and loading/unloading criterion that results in explicit integrations of stress-strain model equations; the density dependency extended to more ingredients of the model structure, especially to plastic shear and bulk moduli that achieves 'one set of model parameters for one sand' for cyclic loading responses; and the appropriate use of three intrinsic history dependent variables, i.e., the latest stress reversal point, the virgin loading (i.e. maximum pre-stress) stress ratio, and the accumulated plastic deviatoric strains that contribute greatly to the enhanced capabilities of the revised model. The model is first calibrated based on three symmetrical cyclic loading responses. Using the single set of model parameters, the model is then used to predict the sand behavior under asymmetrical cyclic loadings and different initial confining pressures. Lastly, the model predictions are checked against empirical correlations established between cyclic resistance ratio (CRR) with initial shear stresses and confining pressures, or the commonly referred to K-alpha and K-sigma effects. The obtained model predictions not only compare relatively well with the test data, but the K-alpha and K-sigma effects based on model predictions follow the trend of empirical relationships too.
机译：循环简单剪切试验的综合数据包用于严格检查和修改砂的塑性模型。这些循环简单剪切试验是使用具有不同相对密度的蒙特雷0/30号砂在复杂的载荷条件下进行的，这些载荷条件包括具有各种初始剪切应力和上覆压力的不对称循环载荷。新修订的模型具有几个新颖的概念：使用依赖于应变增量的流规则和加载/卸载准则，从而导致应力-应变模型方程的显式积分；密度相关性扩展到模型结构的更多成分，尤其是塑性剪切和体积模量，该模型实现了“一砂的一组模型参数”以实现循环荷载响应；并适当地使用三个内在的历史因变量，即最新的应力反转点，原始载荷（即最大预应力）应力比以及累积的塑性偏向应变，这些因素极大地有助于改进模型的增强功能。首先基于三个对称循环荷载响应对模型进行校准。然后使用单个模型参数集，使用该模型来预测非对称循环载荷和不同初始围压下的砂土行为。最后，将模型预测与循环阻力比（CRR）与初始剪应力和围压或通常称为K-α和K-sigma效应之间建立的经验相关性进行检验。所获得的模型预测不仅与测试数据比较好，而且基于模型预测的K-alpha和K-sigma效应也遵循经验关系的趋势。

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