《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“具有横向扩展效应和孔隙重分布效应的离心试验的模拟”

作者：Ronnie Kamai and Ross W. Boulanger

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年8月，139卷第8期，1250–1261页

关键词：液化；横向扩展；离心机；数值；模拟；孔隙比重分布；局部剪应变；FLAC

摘要：为了检验数值模拟方法的有效性和对变形机理的理解，本文对离心试验进行了数值模拟。模拟过程中测量和记录了消散方式、横向扩展和局部剪应变。基于可靠的试验数据进行了本构模型的率定，并进行了详细描述。为提供更相似的边界条件和初始应力分布，对模型箱和施工顺序进行了模拟。给出了两种模拟连续震动事件的方法并对其进行了比较。离心试验得到的主要观测数据和机理都可以通过数值模拟进行合理的记录和限定，其中能够模拟的内容包括：（1）液化的动态响应和开始；（2）表面变形的总量和形式；（3）孔压消散形式和孔隙比重分布；（4）采用液化排水处理的砂土断面和未采用液化排水处理的砂土断面响应的区别。

Simulations of a Centrifuge Test with Lateral Spreading and Void Redistribution Effects

Authors: Ronnie Kamai and Ross W. Boulanger

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 8 (August 2013), 1250–1261

Key words: Liquefaction, Lateral spreading, Centrifuge, Numerical, Simulations, Void-ratio redistribution, Shear-strain localization, FLAC

Abstract: Numerical simulations of a centrifuge test, in which dissipation patterns, lateral spreading, and shear strain localization were measured and recorded, are performed for validation of the numerical modeling approach and insight on the deformation mechanisms. The constitutive model calibration process is performed based on available laboratory data and is described in detail. The model container and construction sequence are simulated to provide good approximations of the boundary conditions and initial stress distributions. Two approaches for simulating successive shaking events are presented and compared. The key observations and mechanisms from the centrifuge test, namely (1) the dynamic response and onset of liquefaction, (2) the amount and pattern of surface deformation, (3) the patterns of pore pressure dissipation and void ratio redistribution, and (4) the difference in response between a sand profile treated and not treated with liquefaction drains, are all reasonably captured and bounded by the simulations.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000845