| 带桩沉箱复合基础水平向承载性状模型试验研究 |
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| 引用本文： | 王 磊,过 超,穆保岗,龚维明,孙振威.带桩沉箱复合基础水平向承载性状模型试验研究[J].岩土力学,2015,36(11):3150-3156. |
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| 作者姓名： | 王 磊 过 超 穆保岗 龚维明 孙振威 |
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| 作者单位： | 1. 东南大学 土木工程学院，江苏 南京 210096；2. 东南大学 混凝土及预应力混凝土结构教育部重点实验室，江苏 南京 210096； 3. 中交公路规划设计院有限公司，北京 100088；4. 中国建筑上海设计研究院有限公司，上海 200063 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）（No.2013CB036304）；“十二五”交通运输重大科技专项（No.2011318494160）。 |
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| 摘 要： | 以琼州海峡跨海大桥工程为背景，通过4组不同型式深水桥梁基础模型试验，对新型带桩沉箱复合基础的水平向承载性能进行了初步研究。试验得到了4组模型在砂性土层中的Q-s曲线及水平向极限承载力，并对复合基础在各级水平荷载下的桩身弯矩和剪力进行了详细分析，同时对沉箱-桩荷载分担比展开了讨论。试验结果表明：当增加裙边、钢管桩、或同时增加钢管桩和裙边后能够使单体沉箱基础的水平向极限承载力分别提高1.2倍、1.6倍和2.0倍；桩身最大弯矩点均出现在桩身中部即泥面下约0.5 m处。水平荷载主要由上部沉箱基础及桩身中上部土体承担，钢管桩桩顶与沉箱连接部位出现最大剪力，在实际工程中应在此处采取加固措施。研究成果可为这一新型深水桥梁基础的推广应用提供诸多有益参考。
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| 关 键 词： | 带桩沉箱 复合基础 水平承载作用 试验研究 |
| 收稿时间： | 2015-04-30 |
Experimental research on horizontal bearing behavior of caisson-pile composite foundation |
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| WANG Lei,GUO Chao,MU Bao-gang,GONG Wei-ming,SUN Zhen-wei.Experimental research on horizontal bearing behavior of caisson-pile composite foundation[J].Rock and Soil Mechanics,2015,36(11):3150-3156. |
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| Authors: | WANG Lei GUO Chao MU Bao-gang GONG Wei-ming SUN Zhen-wei |
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| Institution: | 1. School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China; 2. Key Laboratory for RC and PRC Structure of Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China; 3. China Communication Highway Planning and Design Institute, Beijing 100088, China; 4. China Shanghai architectural design & research institute, Shanghai 200063, China |
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| Abstract: | In this study, four groups of different types of bridge foundation model are tested to research the horizontal bearing behavior of caisson-pile composite foundation in lab based on the Qiongzhou Strait bridge project. The Q-s curve and horizontal ultimate bearing capacity of these four groups of foundations in sandy soil layer are obtained. Pile bending moment and shear force of pile shaft are analyzed in detail. At the same time, the load sharing ratio of caisson and piles is discussed. The results show that the horizontal ultimate bearing capacities of a single caisson foundation are increased by 1.2 times, 1.6 times and 2 times respectively with adding skirts, steel pipe pile, or steel pipe pile and the skirt. The maximum bending moment point is in the middle of the pile shaft, i.e. at about 0.5 m under the mud surface. The horizontal load is borne mainly by the upper caisson foundation and soil layers above the middle upper part of pile. The maximum shear force is found at the joint of pile top of steel pipe and caisson pile, where the reinforcement measures should be taken in practical engineering. The research achievements could provide a better reference for design or construction of caisson-pile composite foundation. |
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| Keywords: | caisson-piles composite foundation horizontal bearing capacity experimental research |
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