Collaborative Research: Full Size Experiments and Centrifuge Physical Models of Pile Foundations Subjected to Lateral Spreading: Comparative Study and Engineering Interpretation

本研究的目的是在全尺寸和离心模型条件下，实验研究地震引起的液化对桩基横向扩展的影响。将在三个设施进行基础振动的微倾斜层流箱中进行仪器化单桩和嵌入1层和2层土剖面的桩群的对比试验：1)RPI的100g吨岩土离心机、层流箱和飞行振动台，2)日本NIED的6米高层流箱和1g振动台（世界上最大的层流箱），3)UCSD的1.9米高层流箱和1g振动台（美国最大的层流箱）。利用RPI在这类测试方面的成功经验，这项研究首次有机会在受控实验环境中直接比较将在NIED进行的离心机和全尺寸测试的结果。此外，离心机和全尺寸NIED结果将用于验证使用UCSD振动台和层流箱进行的中型实验。先进的数据分析技术——包括系统识别和可视化——将用于处理和比较三个设施的结果，并进行工程解释和计算机模拟。

This research effort aims to study experimentally the effect of earthquake-induced lateral spreading due to liquefaction on pile foundations, both in full size and centrifuge model conditions. Comparable tests of instrumented single piles and pile groups embedded in 1-and 2-layer soil profiles will be conducted in slightly inclined laminar boxes subjected to base shaking at three facilities: 1) The 100g-ton geotechnical centrifuge, laminar box and in-flight shaker at RPI, 2) The 6m high laminar box and 1g shaking table at NIED, Japan (largest laminar box in the world), and 3) the 1.9m high laminar box and 1g shaking table at UCSD (largest laminar box in the US). Taking advantage of the successful experience at RPI in this kind of testing, this research constitutes the first opportunity for direct comparison of results in controlled experimental environments between centrifuge and full sized tests to be conducted at NIED. Additionally, centrifuge and full size NIED results will be used to validate the medium-size experiments to be performed using the UCSD shaking table and laminar box. Advanced data analysis techniques-including system identification and visualizations-will be used to process and compare the results from the three facilities, with engineering interpretations and computer simulations.