湿陷性黄土地基大跨度桩基承载特性模型试验

刘小华; 廖红建; 李明泽; 刘少华; 李杭州

doi:10.16152/j.cnki.xdxbzr.2024-01-011

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湿陷性黄土地基大跨度桩基承载特性模型试验

工程地质灾害 | 更新时间：2024-01-18

- 湿陷性黄土地基大跨度桩基承载特性模型试验
- Model test on bearing characteristics of long-span pile foundation of collapsible loess foundation
- 西北大学学报（自然科学版） 2024年54卷第1期页码：93-100
- 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：
  
  刘小华，男，博士生，从事黄土特性与应用研究，liuxh2099@stu.xjtu.edu.cn。
  廖红建，女，博士，教授，从事岩土本构关系、岩土工程减灾与防灾等研究，hjliao@mail.xjtu.edu.cn。
- 基金信息：
  
  国家自然科学基金(51879212;41630639);陕西省重点研发计划项目(2019KWZ-09);陕西省秦创原“科学家+工程师”队伍建设项目(2023KXJ-178)
- DOI：10.16152/j.cnki.xdxbzr.2024-01-011
  中图分类号：
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刘小华, 廖红建, 李明泽, 等. 湿陷性黄土地基大跨度桩基承载特性模型试验[J]. 西北大学学报（自然科学版）, 2024,54(1):93-100.

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), 2024,54(1):93-100.
刘小华, 廖红建, 李明泽, 等. 湿陷性黄土地基大跨度桩基承载特性模型试验[J]. 西北大学学报（自然科学版）, 2024,54(1):93-100. DOI： 10.16152/j.cnki.xdxbzr.2024-01-011.

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), 2024,54(1):93-100. 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

references

于加云.模筑钢筋混凝土支护与软岩相互作用机理研究[D].成都: 西南交通大学, 2007.

TOMA T M. A model study of negative skin friction on a fixed base pile in soft clay[D].Edinburgh: Heriot watt University, 1989.

牛亚强, 王旭, 郑静, 等.侧向约束防渗路基新结构防渗效果试验研究[J].岩土力学, 2015, 36(S2):252-258.

NIU Y Q, WANG X, ZHENG J, et al.Experimental study on the anti-seepage effect of the new structure of lateral confinement anti-seepage subgrade[J]. Chinese Journal of Rock and Soil Mechanics, 2015, 36(S2):252-258.

陆明生.桩基表面负摩擦力的试验研究及经验公式[J].水运工程, 1997(5):54-58.

LU M S.Experimental study and empirical formula of negative friction on pile foundation surface[J].Water Transport Projects, 1997(5):54-58.

王兆辉, 陈天镭.湿陷性黄土地基中主动减小负摩阻力新桩型的试验研究[J].工业建筑, 2021, 51(5):151-157, 144.

WANG Z H, CHEN T L.Experimental study on a new pile type that actively reduces negative friction resistance in collapsible loess foundation[J].Industrial Construction, 2021, 51(5):151-157, 144.

ASSALLAY A M, ROGERS C D F, SMALLEY I J. Formation and collapse of metastable particle packings and open structures in loess deposits[J]. Engineering Geology, 1997, 48(1/2):101-115.

康向涛, 黄滚, 邓博知, 等.模拟原煤的相似材料试验研究[J].东北大学学报(自然科学版), 2015, 36(1):138-142.

KANG X T, HUANG G, DENG B Z, et al. Experimental study on similar material for simulating raw coal[J].Journal of Northeastern University(Natural Science), 2015, 36(1):138-142.

LAWTON E C, FRAGASZY R J, HARDCASTLE J H. Collapse of compacted clayey sand[J].Journal of Geotechnical Engineering, 1989, 115(9):1252-1267.

BASMA A A, TUNCER E R. Evaluation and control of collapsible soils[J]. Journal of Geotechnical Engineering, 1992, 118(10):1491-1504.

袁文忠.相似理论与静力学模型试验[M].成都: 西南交通大学出版社, 1998.

王汉鹏, 李术才, 张强勇, 等.新型地质力学模型试验相似材料的研制[J].岩石力学与工程学报, 2006, 25(9):1842-1847.

WANG H P, LI S C, ZHANG Q Y, et al.Development of similar materials for new geomechanical model tests[J].Chinese Journal of Rock Mechanics and Engineering, 2006, 25(9):1842-1847.

张延杰, 王旭, 梁庆国, 等.湿陷性黄土模型试验相似材料的研制[J].岩石力学与工程学报, 2013, 32(S2):4019-4024.

ZHANG Y J, WANG X, LIANG Q G, et al.Development of modeltest similar material of collapsible loess[J].Chinese Journal of Rock Mechanics and Engineering, 2013, 32(S2):4019-4024.

胡再强, 沈珠江, 谢定义.结构性黄土的变形特性[J].岩石力学与工程学报, 2004, 23(24):4142-4146.

HU Z Q, SHEN Z J, XIE D Y.Deformation properties of structural loess[J].Chinese Journal of Rock Mechanics and Engineering, 2004, 23(24):4142-4146.

WANG T T, JIANG B L, SUN X J. Train-induced vibration prediction and control of a metro depot and over-track buildings[J]. Buildings, 2023, 13(8):1995.

LIANG R H, DING D Y, LIU W F, et al. Experimental study of the source and transmission characteristics of train-induced vibration in the over-track building in a metro depot[J]. Journal of Vibration and Control, 2023, 29(7/8):1738-1751.

TAO Z Y, ZOU C, WANG Y M, et al.Vibration transmissions and predictions within low-rise buildings above throat area in the metro depot[J].Journal of Vibration and Control, 2023, 29(5/6):1105-1116.

FENG Q S, ZHANG Y L, JIANG J, et al. Field measurement and evaluation of vibration in different areas of a metro depot[J].Earthquake Engineering and Engineering Vibration, 2022, 21(2):529-542.

CHEN Y M, FENG Q S, LIU Q J, et al. Experimental study on the characteristics of train-induced vibration in a new structure of metro depot[J].Environmental Science and Pollution Research, 2021, 28(30): 41407-41422.

ZOU C, WANG Y M, ZHANG X, et al. Vibration isolation of over-track buildings in a metro depot by using trackside wave barriers[J]. Journal of Building Engineering, 2020, 30:101270.

TAO Z Y, WANG Y M, SANAYEI M, et al. Experimental study of train-induced vibration in over-track buildings in a metro depot[J].Engineering Structures, 2019, 198:109473.

CAO Z L, GUO T, ZHANG Z Q. Vibration measurement in a metro depot with trains running in the top story[J]. Journal of Vibroengineering, 2017, 19(1):502-519.

PENG H, PANG F Y, LI Z C, et al. Study on the impact of a metro depot cover structure on the existing metro structure and additional settlement of tracks[J]. Buildings, 2023, 13(8):1914.

陈昌禄, 邵生俊, 张喆.人工制备结构性黄土的真三轴试验研究[J].岩土力学, 2013, 34(8):2231-2237.

CHEN C L, SHAO S J, ZHANG Z.Study of artificial structural loess under true triaxial tests[J]. Chinese Journal of Rock and Soil Mechanics, 2013, 34(8):2231-2237.

中华人民共和国住房和城乡建设部.建筑基桩检测技术规范：JGJ 106—2014[S].北京: 中国建筑工业出版社, 2014.

黄雪峰, 陈正汉, 哈双, 等.大厚度自重湿陷性黄土场地湿陷变形特征的大型现场浸水试验研究[J].岩土工程学报, 2006, 28(3):382-389.

HUANG X F, CHEN Z H, HA S, et al. Large area field immersion tests on characteristics of deformation of self weight collapse loess under overburden pressure[J].Chinese Journal of Geotechnical Engineering, 2006, 28(3):382-389.

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