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JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Civil Engineering     
Effect of vertical load on lateral behavior of single pile in clay
HE Ben, WANG Huan, HONG Yi, WANG Li zhong, ZHAO Chang jun, QIN Xiao
1.Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China;
2.Zhejiang Provincial Institute of Communications Planning, Design and Research, Hangzhou 310002, China;
3.Wenzhou Communication Investment Group Limited Company, Wenzhou 325000, China;
4.Power China Huadong Engineering Corporation, Hangzhou 311122, China
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Abstract  

 A series of detailed centrifuge test were performed in order to investigate the lateral monotonic and cyclic behavior of a single pile in normal (NC) and over consolidated clay (OC) with and without application of vertical loading at the pile head. Three dimensional finite element analyses (FEA) were conducted to offer further insights into the effects of vertical loading on the lateral initial stiffness and bearing capacity of the pile. Both physical and numerical investigation reveal that after applying the vertical load and allowing the dissipation of excess pore pressure in NC, the stress ratio of the soil around the pile decreases while the mobilisable undrained shear stength increases, resulting in 10% and 50% increase of the lateral initial stiffness and bearing capacity of the pile, respectively. Due to application of vertical load to a single pile in the over consolidated clay, the soil stress ratio prior to lateral loading increases while the mobilisable undrained shear stength decreases, consequently leading to 13% and 33% reduction of the lateral initial stiffness and bearing capacity of the pile, respectively.



Published: 23 July 2016
CLC:  TU 473  
Cite this article:

HE Ben, WANG Huan, HONG Yi, WANG Li zhong, ZHAO Chang jun, QIN Xiao. Effect of vertical load on lateral behavior of single pile in clay. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(7): 1221-1229.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.07.001     OR     http://www.zjujournals.com/eng/Y2016/V50/I7/1221


竖向荷载对黏土地基中单桩水平受荷性能的影响

为了研究正常固结土(NC)和超固结土(OC)中,竖向荷载作用后,允许土体固结和超静孔压消散的条件下,桩体的水平静、循环受荷性能,开展8组离心模型试验.基于试验结果,开展三维有限元模拟(FEA),揭示竖向荷载对桩体水平受荷性能的影响机理,分析不同竖向荷载作用下,桩体水平初始刚度和极限承载力的变化规律.结果表明,在正常固结土中,施加竖向工作荷载,并允许土体孔压消散,减少了土体的初始应力比,增加了可发挥的土体不排水抗剪强度,提高10%的桩基水平极限承载力和50%的初始桩头刚度;在超固结土中,施加竖向荷载,增加了土体的初始应力比,减少了可发挥的土体不排水抗剪强度,降低了13%桩基的水平静极限承载力和33%的初始桩头刚度.

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