Effect of soil gradation on embankment response during liquefaction: A centrifuge testing program
Effect of soil gradation on embankment response during liquefaction: A centrifuge testing program
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土级配对液化过程中路堤响应的影响：离心机测试程序
DOI：
10.1016/j.soildyn.2022.107221
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发表时间：
2022
影响因子：
4
通讯作者：
DeJong, Jason T.
中科院分区：
文献类型：
--
作者：
Carey, Trevor J.;Chiaradonna, Anna;Love, Nathan C.;Wilson, Daniel W.;Ziotopoulou, Katerina;Martinez, Alejandro;DeJong, Jason T.
本文介绍了一项离心机研究，旨在研究砂粒级配如何影响遭受强烈震动的路堤的系统级性能。目前的分析和设计实践主要基于液化案例历史记录中的知识，其中大多数来自由干净的、级配不良的沙子组成的场地。在分析传统上用更广泛的级配土壤建造或建立在更广泛的级配土壤上的路堤结构时，案例历史数据库中代表的狭窄级配特征范围提出了挑战。本文的测试旨在阐明用级配良好和级配较差的沙子均匀建造的路堤在地震震动过程中表现如何不同。使用加州大学戴维斯分校岩土建模中心的 9 米半径离心机开发并进行了离心机实验测试程序。实验设计包括两个并排放置在同一刚性模型容器中的水下 10 度路堤，其中一个路堤采用级配较差的砂子建造，另一个采用级配良好的砂子建造。路堤干淤成的相对密度相同，但沙子的绝对密度不同。路堤在斜坡上方的平地下方和斜坡中部同样配备了密集的现场传感器阵列，以测量液化过程中的动态响应。结果表明，以相同相对密度建造的路堤都会液化（即rureach 1.0），但用级配良好的砂建造的路堤变形不太严重。更强的抗超孔隙水压力的产生能力和更快的消散能力，再加上级配砂的更强的剪胀性，增加了路堤的稳定性，减少了液化引起的变形。
This paper describes a centrifuge study undertaken to investigate how sand gradation affects the system-level performance of embankments subjected to strong shaking. Current analysis and design practices are primarily based on knowledge from case history records of liquefaction, with the majority of those from sites consisting of clean, poorly graded sands. The narrow range of gradation characteristics represented in the case history database poses a challenge during the analysis of embankment structures traditionally constructed with, or founded on, more broadly graded soils. The tests herein were designed to elucidate how embankments uniformly constructed with a well graded and poorly graded sand perform differently during earthquake shaking. A centrifuge experiment test program was developed and conducted using the 9-m-radius centrifuge at the UC Davis Center for Geotechnical Modeling. The experiment design consisted of two submerged 10-degree embankments positioned side-by-side in the same rigid model container, with one embankment constructed with poorly graded sand and the other with well graded sand. The embankments were dry pluviated to the same relative density, but the absolute densities of the sands were different. The embankments were identically instrumented with dense arrays of in-situ sensors beneath the level ground above the slope and in the mid-slope to measure the dynamic response during liquefaction. Results showed that embankments constructed at equal relative densities would both liquefy (i.e., rureach 1.0), but deformations were less severe for the embankments constructed with the well graded sand. Greater resistance to the generation and faster dissipation of excess porewater pressures, coupled with stronger dilatancy of the well graded sand increased embankment stability, curtailing liquefaction-induced deformations.
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