《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“静态液化的模型预测：初始状态对潜在失稳的影响”

作者：Giuseppe Buscarnera; Andrew J. Whittle

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年3月，139卷第3期，420–432页

关键词：静态液化；力学失稳；本构模拟；砂土；流滑

摘要：本文检验了砂土的初始状态对潜在不排水失稳的影响。主要阐明了如何通过改进砂土特性的本构模拟并将其用于估计静态液化的敏感性。该方法基于潜在失稳的概念，该概念中失稳的可能性由特定的边界条件决定。本文采用了广义有效应力土体模型MIT-S1来证实分析结果，并与理论方法相结合来确定不排水剪切干扰引起的失控。利用Toyoura砂的有效试验现象对该理论进行了评价，指出了孔隙比和固结历史的关键作用，并为理论提供了试验验证。随后采用了模型预测法揭示了排水预加载对加速液化失稳的作用不明显。该本构模型对模拟不排水运动约束与材料破坏之间相互作用的能力对由于排水条件变化引起潜在失稳的预测发挥着重要作用。最后通过工程实例阐明了静态液化的力学机制，设定了将材料稳定性原则应用于由不排水剪切扰动诱发的流滑触发分析框架。

Model Prediction of Static Liquefaction: Influence of the Initial State on Potential Instabilities

Authors: Giuseppe Buscarnera; Andrew J. Whittle

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 3 (March 2013), 420–432

Key words: Static liquefaction, Mechanical instability, Constitutive modeling, Sands, Flow slides

Abstract: This paper examines the influence of the initial state of sands on the potential for undrained instability. The main goal is to illustrate how advanced constitutive modeling of sand behavior can be used to evaluate the susceptibility for static liquefaction. The methodology is based on the concept of latent instability, in which the potential for collapse is contingent on particular boundary conditions. A generalized effective stress soil model, MIT-S1, is used to support the analysis and is combined with a theoretical approach for identifying loss of control owing to undrained shear perturbations. The theory is evaluated using experimental evidence available for Toyoura sand to point out the key role of void ratio and consolidation history and to provide experimental validation for the theory. Model predictions are then used to disclose the subtle role of drained preloading paths in promoting liquefaction instabilities. The ability of the constitutive model to reproduce the interplay between undrained kinematic constraints and material failure is fundamental in predicting potential instabilities arising from changes in drainage conditions. The examples shed light on the mechanics of static liquefaction and set a framework for applying the principles of material stability to the triggering analysis of flow slides induced by undrained shear perturbations.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000779