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Gu M.,Zhejiang University | Gu M.,Key Laboratory of Soft Soils and Geoenvironmental Engineering | Chen R.-P.,Zhejiang University | Chen R.-P.,Key Laboratory of Soft Soils and Geoenvironmental Engineering | And 5 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

A series of centrifugal model tests are conducted to investigate the behavior of pile groups in sand subjected to eccentric lateral loads, especially the role of batter pile groups in resisting lateral or eccentric loads. The preparation and the procedure of the tests are described. The test results reveal that the eccentric distance of the lateral loads will affect the lateral response of the pile groups to some extent within the experimental range, but have little effect on the torsional behavior of the pile groups. The bearing capacity of the plumb pile group under lateral loads with eccentric distance of 4.3D is higher than that of zero and 7.1D. The capacity of the batter pile groups subjected to lateral, eccentric or torsional loads is much higher than that of the plumb pile groups. Under the eccentric loads, the differences between the lateral displacements of individual piles within the batter pile groups are larger than those in the plumb pile groups, and they also increase with the eccentric distance of the lateral loads. The shear forces and lateral displacements at head of individual piles are different in direction. The axial forces of individual piles within the batter pile groups are dramatically larger than those in the plumb pile groups under the same load condition, which illustrates that batter pile groups can more effectively resist the lateral loads than the plumb pile groups by taking full advantages of the axial capacity of individual piles. ©, 2014, Nanjing Hydraulic Research Institute. All right reserved. Source


Chen R.-P.,Zhejiang University | Chen R.-P.,Key Laboratory of Soft Soils and Geoenvironmental Engineering | Gu M.,Zhejiang University | Gu M.,Key Laboratory of Soft Soils and Geoenvironmental Engineering | And 5 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

Large-scale physical model tests are carried out to study the mechanical characteristics of high-rise platform pile groups subjected to cyclic lateral loads such as wave, tidewater and wind, etc. They are conducted in silts, which consist of nine steel-pipes in a closely-spaced arrangement. The response of pile groups and its variation under cyclic loading conditions are discussed. The results indicate that the cyclic loading produces plastic deformation within soil around piles. The lateral stiffness of pile-soil system decreases with cycling, and the lateral load carried by each pile is redistributed during repeated loading. The previous cyclic loading influences the stiffness of piles in the next loading stages. The effect induced by the cyclic loading is more important for group-pile than a single pile, which can be estimated by a multiplier based on the p-y curve method. Finally, a comparison between the calculated results and those obtained by other different methods is presented. Source


Chen W.,Zhejiang University | Zhu X.,Key Laboratory of Soft Soils and Geoenvironmental Engineering | Zhu X.,Zhejiang University | Huang Z.,Key Laboratory of Soft Soils and Geoenvironmental Engineering | Huang Z.,Zhejiang University
Science China Technological Sciences | Year: 2010

A micromechanical approach based on a two-layer built-in model and a numerical simulation based on boundary element method are proposed to predict the effective properties of the multi-inclusion composite with imperfect interfaces. The spring model is introduced to simulate the interface imperfection. These two methods are compared with each other, and good agreement is achieved. The effects of interface spring stiffness, volume ratio and stiffness of inclusions on the micro- and macro-mechanical behaviors of fiber-reinforced composites are investigated. It is shown that the developed micromechanical method is very comprehensive and efficient for fast prediction of effective properties of composites, while the numerical method is very accurate in detailed modeling of the mechanical behavior of composites with multiple inclusions. © 2010 Science in China Press and Springer-Verlag Berlin Heidelberg. Source

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