VELACS - Verification of Liquefaction Analysis using Centrifuge Studies-An Extension

这是VELACS（离心液化分析验证）项目的延伸，其目的是评估用于土壤液化分析的现有数值和本结构模型的相关性和有效性。其动机是解决VELACS在A类预测中遇到的困难，并找出造成这些困难的主要原因。VELACS表明，目前用于岩土结构分析的程序通常不适用于预测土壤液化的后果。本项目将确定用于分析土壤液化及其后果的一些最有前途的程序。将进行一系列精心进行的三轴和扭转试验并进行仔细检查，以便提供一个小而可靠的数据库。这些数据将用于本构模型的校准，而本构模型又将用于两个离心机模型实验的a级预测练习。将预测结果与实验结果进行比较，并讨论潜在差异的原因。将对可靠性进行多次检查，以找出VELACS项目中已经考虑的实验缺乏可靠预测的原因。＊＊＊

9423748 Lacy This is an extension to the VELACS (Verification of Liquefaction Analysis by Centrifuge Studies) project, the purpose of which was to evaluate the relevance and effectiveness of the existing numerical and constitutive models used in the analysis of soil liquefaction. The motivation is to resolve the difficulties encountered in the Class A predictions of VELACS, and to isolate the main cause of these difficulties. VELACS revealed that the current procedures used for the analysis of geotechnical structures are not suitable, in general, for predicting the consequences of soil liquefaction. Some of the most promising procedures available for the analysis of soil liquefaction and its consequences will be identified in this project. A series of carefully-performed triaxial and torsional tests are to be conducted and carefully examined, so as to provide a small but reliable data base. These data will be used for the calibration of constitutive models, which in turn will be used for a Class A prediction exercise of two centrifuge model experiments. The predictions will be compared with the experimental results, and reasons for potential discrepancies will be discussed. Multiple checks for reliability will be conducted in an effort to isolate reasons for the lack of reliable predictions of the experiments already considered in the VELACS project. ***