Model test on bearing characteristics of long-span pile foundation of collapsible loess foundation
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 1, Pages: 93-100(2024)
- 作者机构：
1.广州地铁设计研究院股份有限公司，广东 广州 510010
2.西安交通大学城市学院 土木建筑工程学院，陕西 西安 710018
3.西安交通大学 人居环境与建筑工程学院，陕西 西安 710049
- 作者简介：
- 基金信息：
DOI：10.16152/j.cnki.xdxbzr.2024-01-011
CLC：
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LIU Xiaohua, LIAO Hongjian, LI Mingze, et al. Model test on bearing characteristics of long-span pile foundation of collapsible loess foundation. [J]. Journal of Northwest University (Natural Science Edition) 54(1):93-100(2024)
LIU Xiaohua, LIAO Hongjian, LI Mingze, et al. Model test on bearing characteristics of long-span pile foundation of collapsible loess foundation. [J]. Journal of Northwest University (Natural Science Edition) 54(1):93-100(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-01-011.
摘要
城市车辆段上盖开发工程中的大跨度桩基具有单桩竖向承载较大、桩间大跨度范围内土体受荷较小的特点。以西安地铁某车辆段大跨度桩基为研究对象，制备人工湿陷性黄土作为相似材料，开展了湿陷性黄土地层大跨度桩基的室内模型试验，研究大跨度桩基在湿陷性黄土地层中的荷载传递机制与变形规律。结果表明：制备的人工湿陷性黄土与现场原状黄土性质接近，将其应用于模型试验时可以得到良好的效果；大跨度桩基在未浸水时，荷载沉降曲线为陡降型，桩身轴力在桩顶附近显著下降，未达到极限承载力时，桩顶沉降、桩端阻力线性增大；在黄土浸水湿陷后，桩身轴力沿埋深方向呈“D”字型分布，随着浸水时间的增加，桩顶沉降、桩端阻力先缓慢增加后显著增加，中性点位置不断向桩身下部移动。
Abstract
The long-span pile foundation in the development project of the superstructure of the urban depot has the characteristics of larger vertical bearing of a single pile, and the soil within the large span between the piles is lesser stressed. Taking the long-span pile foundation of a depot of Xi’an Metro as the research object, artificial collapsible loess is prepared as a similar material. An indoor model test of long-span pile foundation in collapsible loess layer was carried out. The load transfer mechanism and deformation law of long-span pile foundation in collapsible loess layer were studied. The results show that the prepared artificial collapsible loess is close in nature to the original loess on site, which can achieve good results in the application of model tests. When the long-span pile foundation is not flooded, the load-settlement curve is steep, and the axial force of the pile body decreases significantly near the top of the pile. When the ultimate bearing capacity is not reached, the pile top settles and the pile end resistance increases linearly. After the loess is flooded, the axial force of the pile body is distributed in a "D" shape along the direction of burial depth. With the increase of water immersion time, the pile top settlement and pile end resistance first slowly increased and then increased significantly, and the neutral point position continued to move to the lower part of the pile body.
关键词
湿陷性黄土桩基模型试验负摩阻力
Keywords
collapsible loesspile foundationmodel testingnegative friction resistance
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