Mesoscopic working mechanism of cushion of composite foundation under rigid slab

被引:0
|
作者
Rui Rui [1 ]
Sun Yi [1 ]
Zhu Yong [2 ]
Wu Duan-zheng [1 ]
Xja Yuan-you [1 ]
机构
[1] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Hubei, Peoples R China
[2] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
cushion; composite foundation; rigid slab; working mechanism; model test;
D O I
10.16285/j.rsm.2017.1598
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
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.
引用
收藏
页码:445 / 454
页数:10
相关论文
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