| 刚性基础下复合地基褥垫层细观工作机制 |
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| 引用本文： | 芮瑞,孙义,朱勇,吴端正,夏元友.刚性基础下复合地基褥垫层细观工作机制[J].岩土力学,2019,40(2):445-454. |
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| 作者姓名： | 芮瑞 孙义 朱勇 吴端正 夏元友 |
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| 作者单位： | 1. 武汉理工大学 土木工程与建筑学院，湖北 武汉 430070；
2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071 |
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| 基金项目： | 国家自然科学基金（No. 51208403）；湖北省自然科学基金（No. 2016CFB469）；武汉市城建委科技计划项目（No. 201639）；中央高校基本科研业务费资助（No. 2017-zy-053）。 |
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| 摘 要： | 垫层是保证变形协调、实现复合地基荷载合理分配的关键组件。但目前对垫层细观工作机制的认识还不够深入，参数选取主要依赖经验。为了进一步揭示垫层协调工作机制，利用自制试验装置进行了3种不同填料高度下的砂垫层可视化平面应变试验。结合2D DEM数值正交试验，揭示了不同尺寸参数组合下垫层的3种变形形态及其细观力链分布特征，指出变形形态与垫层相对厚度（厚度与桩间净距的比值）有关，并提出了按相对厚度控制垫层参数选取的建议。同时，通过垫层细观工作机制分析，提出垫层协调性能的评价指标，利用正交试验分析得到了垫层厚度与桩间净距是影响垫层变形协调能力的显著因素，给出了指标的取值上限值以指导垫层参数设计。
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| 关 键 词： | 褥垫层 复合地基 刚性基础 工作机制 模型试验 |
| 收稿时间： | 2017-07-31 |
Mesoscopic working mechanism of cushion of composite foundation under rigid slab |
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| RUI Rui,SUN Yi,ZHU Yong,WU Duan-zheng,XIA Yuan-you.Mesoscopic working mechanism of cushion of composite foundation under rigid slab[J].Rock and Soil Mechanics,2019,40(2):445-454. |
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| Authors: | RUI Rui SUN Yi ZHU Yong WU Duan-zheng XIA Yuan-you |
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| Institution: | 1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China; 2. State Key Laboratory of
Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China |
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| Abstract: | Cushion is a key component of composite foundation, which ensures the deformation coordination and rationality of load distribution between soils and piles. However, the mesoscopic working mechanism of the cushion is not well investigated and the design parameters of cushion are mainly determined according to the experience. In order to reveal the coordination mechanism of the cushion, a test apparatus was designed to simulate the working of cushion in the composite foundation. Three visualized plane strain tests were carried out with different heights of the cushion. A series of 2D DEM simulations was conducted with an orthogonal array. Both the model tests and simulation results showed the three similar patterns of deformation which related to the ratio of the cushion height and the net spacing of the piles. Mesoscopic force chain distribution was also analyzed. In addition, a design suggestion of the cushion height was proposed by analyzing. Meanwhile, an index applied to assess the deformation coordination capability was presented. According to the variance analysis and range analysis, it was found that the height of the cushion and the net spacing of the piles were the significant factors which affected the deformation coordination capability. The upper limit value of the index was also explored and proposed to guide the design of cushion. |
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| Keywords: | cushion composite foundation rigid slab working mechanism model test |
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