Prediction of Soil Liquefaction in Centrifuge Model Tests

这一行动是为了响应NSF 第91-55号方案倡议公告： “A级”预测阶段的 液化分析验证 研究项目”。 贝拉克斯是 一项由国家科学基金会资助的 模拟地震荷载对各种 模拟土工结构，如地球 水坝和水库，为了调查 摩擦引起的失效机制， 并获取用于验证 液化的各种分析程序 问题. 实验在 加州的土工离心机 美国加州大学理工学院 在位于博尔德的科罗拉多大学戴维斯分校， 伦斯勒理工学院 英国剑桥大学和剑桥大学。 “A类”预测阶段 VELACS项目涉及制作 分析/计算预测之前， 进行实验;然后， 进行了实验，测量结果 与预测相比。 “A级” 预测类似于“单盲” 医学研究中的研究。 一个研讨会， 定于2004年12月在日内瓦大学举行的 1993年9月，加州戴维斯将 将预测结果与实验结果进行比较 结果和结论将得出关于 分析/计算的有效性 使用的方法。 16个研究小组从 在世界各地（9个在美国;分之一 加拿大;日本三家;英国三家） 都在参与这次预测活动 普林斯顿大学的这项研究 计算机代码的有效性 用于液化的DYNA 1D和DYNAFLOW 分析.

This action is in response to the NSF Announcement of Program Initiative No. 91-55: "The 'Class A' Prediction Phase of the VELACS (Verification of Liquefaction Analysis by Centrifuge Studies) Project". VELACS is an NSF-funded coordinated study of the effect of simulated earthquake loading on a variety of model geotechnical structures, such as earth dams and embankments, in order to investigate the mechanisms of liquefaction-induced failure, and to acquire data for the verification of the various analysis procedures for the liquefaction problem. The experiments are run on the geotechnical centrifuges at the California Institute of Technology, University of California at Davis, University of Colorado at Boulder, Rensselaer Polytechnic Institute, Princeton University and Cambridge University, England. The "Class A" prediction phase of the VELACS project involves making analytical/computational predictions before the experiments are performed; then the experiments are run, and the measured results compared with the predictions. "Class A" predictions are analogous to "single-blind" studies in medical research. A workshop, scheduled to be held at the University of California, Davis, in September, 1993, will compare the predictions to the experimental results, and conclusions will be drawn regarding the effectiveness of the analytical/computational methods used. Sixteen research groups from around the world (nine in the U.S.; one in Canada; three in Japan; and three in the U.K.) are participating in this prediction exercise. This study at Princeton University is examining the effectiveness of the computer codes DYNA1D and DYNAFLOW for liquefaction analysis.