{"title":"Machine induced dynamic field responses of group pile with different pile arrangements","authors":"","doi":"10.1186/s40703-024-00207-3","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>The main objective of the current investigation is to study the dynamic behaviour of a 3-pile group with different loading direction under coupled (horizontal and rocking) excitations. To accomplish this objective, machine-induced field excitation tests are conducted on small-scale hollow steel piles. The 3-pile group is driven into the ground in a triangular arrangement with 3<em>d</em> spacing. Two different soil-pile setups, i.e., Pile Group-I and Pile Group-II, are created based on dynamic force directions. In the case of Pile Group-I, the forces are applied to the direction of the median of the triangle, and for Pile Group-II, the forces are applied to other directional loads. From the test results, it is found that the resonant peaks of horizontal and rocking amplitudes for Pile Group-I are lower than Pile Group-II. In the case of resonant frequencies, the values of Pile Group-I are observed to be the same or a little bit higher as compared to Pile Group-II. It is found that the dynamic soil-pile-soil interaction effect is more prominent for Pile Group-II than for Pile Group-I. For numerical investigation, the continuum approach method is utilised with the inclusion of a dynamic group interaction factor to predict the dynamic coupled responses in terms of frequency and amplitude for these two soil-pile setups. To understand the behaviour of pile groups, boundary zone parameters and variations of impedance parameters (stiffness and damping) with operating frequencies are also measured using this theoretical approach.</p>","PeriodicalId":44851,"journal":{"name":"International Journal of Geo-Engineering","volume":"113 1","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Geo-Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1186/s40703-024-00207-3","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The main objective of the current investigation is to study the dynamic behaviour of a 3-pile group with different loading direction under coupled (horizontal and rocking) excitations. To accomplish this objective, machine-induced field excitation tests are conducted on small-scale hollow steel piles. The 3-pile group is driven into the ground in a triangular arrangement with 3d spacing. Two different soil-pile setups, i.e., Pile Group-I and Pile Group-II, are created based on dynamic force directions. In the case of Pile Group-I, the forces are applied to the direction of the median of the triangle, and for Pile Group-II, the forces are applied to other directional loads. From the test results, it is found that the resonant peaks of horizontal and rocking amplitudes for Pile Group-I are lower than Pile Group-II. In the case of resonant frequencies, the values of Pile Group-I are observed to be the same or a little bit higher as compared to Pile Group-II. It is found that the dynamic soil-pile-soil interaction effect is more prominent for Pile Group-II than for Pile Group-I. For numerical investigation, the continuum approach method is utilised with the inclusion of a dynamic group interaction factor to predict the dynamic coupled responses in terms of frequency and amplitude for these two soil-pile setups. To understand the behaviour of pile groups, boundary zone parameters and variations of impedance parameters (stiffness and damping) with operating frequencies are also measured using this theoretical approach.
摘要 本次研究的主要目的是研究在耦合（水平和摇摆）激励下不同加载方向的三桩群的动态行为。为实现这一目标，对小型空心钢桩进行了机器诱导的现场激振试验。3 根桩以 3d 间距的三角形排列打入地下。根据动作用力方向创建了两种不同的土壤-桩设置，即桩组-I 和桩组-II。在桩组-I 的情况下，力施加在三角形中线的方向上，而在桩组-II 的情况下，力施加在其他方向的荷载上。测试结果表明，桩组-I 的水平和摇摆振幅的共振峰值低于桩组-II。在共振频率方面，观察到桩组-I 的值与桩组-II 相同或略高。研究发现，与桩组 I 相比，桩组 II 的动态土-桩-土相互作用效应更为突出。在进行数值研究时，利用连续介质法，并加入动态群相互作用因子，以频率和振幅来预测这两种土壤-桩设置的动态耦合响应。为了解桩群的行为，还利用该理论方法测量了边界区域参数和阻抗参数（刚度和阻尼）随工作频率的变化。
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