承力盘数量对桩周土影响的试验研究
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1.吉林建筑大学土木工程学院;2.吉林建筑大学交通科学与工程学院

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TU473. 1

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吉林省科技厅重点研发项目(20220203063SF)。


EXPERIMENTAL STUDY ON THE INFLUENCE OF THE NUMBER OF EXPANSION BODIES ON THE SOIL AROUND PILES
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Jilin Jianzhu University School of Civil Engineering

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    摘要:

    为了探讨承力盘数量对扩盘桩的承载力及桩周土体的影响,通过本课题组自行研制的小型半面桩模型试验设备,采用DIC设备实时记录桩周土体变形情况,并以此分析桩周土体位移与破坏特征。试验研究表明,加载时承力盘下土体受压形成压缩区且该区域的影响范围随着荷载增大逐渐变大,同时向两侧土体挤压;承力盘上方裂隙持续发展至最后形成临空区,且该区域随荷载增加而扩大。三盘桩较单盘桩和二盘桩的承载力提升较大,但其荷载-沉降曲线形状较为相似。施加荷载过程中,靠近承力盘和承力盘下方的桩周土体位移变化最明显。因此,本文的研究对于研究承力盘数量对桩周土体影响等相关方向做了补充。

    Abstract:

    In order to explore the impact of the number of bearing plates on the bearing capacity of the expanded pile and the soil around the pile, a small half face pile model test equipment developed by our research group was used to record the deformation of the soil around the pile in real-time using a non-contact full field strain measurement system, and to analyze the displacement and failure characteristics of the soil around the pile. Experimental research shows that during loading, the soil under the load-bearing plate is compressed to form a compression zone, and the influence range of this zone gradually increases with the increase of load, while squeezing towards the soil on both sides; The cracks above the bearing plate continue to develop until a free zone is formed, and this area expands with the increase of load. The bearing capacity of three plate piles has been significantly improved compared to single plate piles and two plate piles, but their load-settlement curve shapes are relatively similar. During the loading process, the displacement changes of the soil around the pile near and below the bearing plate are the most significant. Therefore, this study supplements the research on the impact of the number of bearing plates on the soil around piles and other related directions.

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牛雷,陈亚晴,徐丽娜,等. 承力盘数量对桩周土影响的试验研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-14
  • 最后修改日期:2024-06-06
  • 录用日期:2024-06-19
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