Soil Characterization in Centrifuge Models through Measurement of Shear Wave Velocities Using Bender Elements
Soil Characterization in Centrifuge Models through Measurement of Shear Wave Velocities Using Bender Elements
复制标题
通过使用 Bender 元件测量剪切波速度来表征离心机模型中的土壤特性
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
R. Dobry
中科院分区：
文献类型：
--
作者：
W. El;T. Abdoun;R. Dobry
土的动力特性的确定是岩土工程中的一个关键问题。这是一个特别重要的问题，涉及土壤系统的动态激励，如地震。本研究的重点是在离心土壤模型中测量地震波，特别是剪切波的速度。离心机操作期间的高噪声以及在同一型号中使用多个弯曲元件的需要使得在离心机中使用弯曲元件更具挑战性。本研究从改良RPI岩土工程勘察中心现有的弯曲元件系统开始。这涉及解决系统中的电气和电磁问题，并减少噪音和重影效应。利用改进的Bender单元系统，在离心机中测定了干渥太华砂在不同孔隙比和不同超固结比下的剪切波速。剪切波速度的测量也被用来估计超固结的影响，在休息时的侧土压力系数（K）。与文献中发表的结果进行了比较。
The determination of the dynamic properties of the soil is a critical issue in geotechnical engineering. It is of a particular importance in problems involving dynamic excitation of soil systems, such as earthquakes. This research focuses on measuring the velocity of seismic waves, particularly shear waves, in the centrifuge soil models. The high noise during the centrifuge operation, and the need of using a number of bender elements in the same model, makes the use of bender elements in the centrifuge more challenging. The research starts with improving the current bender elements system at RPI Geotechnical Centrifuge Center. This involves solving electric and electromagnetic problems in the system and reducing noise and ghosting effects. The improved bender elements system is then used to determine the shear (S) wave velocities of dry Ottawa sand at different void ratios and different overconsolidation ratios in the centrifuge. The shear wave velocity measurements are also used to estimate the effect of overconsolidation on the coefficient of lateral earth pressure at rest (K₀). A comparison of the results is done with those published in the literature.