期刊文献+

刚性基础下复合地基褥垫层细观工作机制

Mesoscopic working mechanism of cushion of composite foundation under rigid slab
分享 导出
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。 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.
作者 芮瑞 孙义 朱勇 吴端正 夏元友 RUI Rui;SUN Yi;ZHU Yong;WU Duan-zheng;XIA Yuan-you(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan,Hubei 430070,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)
出处 《岩土力学》 EI CAS CSCD 北大核心 2019年第2期445-454,共10页 Rock and Soil Mechanics
基金 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).
关键词 褥垫层 复合地基 刚性基础 工作机制 模型试验 cushion composite foundation rigid slab working mechanism model test
作者简介 第一作者:芮瑞,男,1981年生,博士,教授,博士生导师,主要从事岩土工程加固设计与理论、软土地基处理方面的研究与教学工作。E-mail:r.rui@whut.edu.cn.
  • 相关文献

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈