This paper deals with the assessment of the post-liquefaction stress-strain behavior of completely or partially liquefied sand and its associated residual strength based on drained test behavior. At present, there is no particular procedure that allows the assessment of the post-cyclic behavior, termed "post-liquefaction" behavior herein, of liquefied or "partially liquefied" (I.e. Softened or liquefying) sand. The prediction of the undrained post-liquefaction response of partially or completely liquefied sands presented here is based on basic properties of sand such as its relative density [or (N_1)_(60) blowcount], the effective angle of internal friction (Φ), the roundness of the sand grains (ρ), the uniformity coefficient (C_u) and the drained axial strain at 50% stress level (ε_(50)). The technique developed by Norris et al. (1997) and Ashour and Norris (1999) has been extended in this paper to predict the varying post-liquefaction response of sand after being partially or completely liquefied by cyclic loading. The technique presented accounts for the excess porewater pressure induced by cyclic loading (Δu_c) and the post-cyclic excess porewater pressure generated under monotonic loading (Δu_c). The findings presented in this paper will help in the study of the lateral spread of liquefied soil and the construction of the p-y curves associated with laterally loaded piles in liquefiable soils.
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机译：本文基于排水试验行为，对完全或部分液化的沙子的液化后应力-应变行为及其相关的残余强度进行评估。当前，没有允许评估液化或“部分液化”（即软化或液化）砂子的循环后行为（在此称为“液化后”行为）的特定程序。此处介绍的部分或完全液化的沙子不排水的液化后响应的预测是基于沙子的基本属性，例如其相对密度[或（N_1）_（60）击穿次数]，有效内摩擦角（Φ） ，砂粒的圆度（ρ），均匀系数（C_u）和在50％应力水平（ε_（50））时的排水轴向应变。该技术由诺里斯等人开发。 （1997）和Ashour and Norris（1999）已在本文中得到扩展，以预测在部分或全部被循环荷载液化后，砂土的液化后响应变化。提出的技术考虑了循环荷载引起的超孔隙水压力（Δu_c）和单调荷载下产生的循环后孔隙水超压力（Δu_c）。本文提出的发现将有助于研究液化土壤的横向扩散以及在液化土壤中与侧向荷载桩相关的p-y曲线的构建。
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