Effect of Flexible Pile on Rigid Flexible Pile Composite Foundation with Geogrid Reinforced Cushion

2014 ◽  
Vol 1065-1069 ◽  
pp. 119-122
Author(s):  
Kai Fu Liu ◽  
Yi Hu ◽  
Yi Jun Zhu ◽  
Zhi Yan Zou ◽  
Jin Ping Mao
Keyword(s):  
Load Distribution ◽  
Composite Foundation ◽  
Soil Arching ◽  
Reinforced Embankments ◽  
Flexible Pile

Compared with pile-supported reinforced embankments, rigid-flexible pile composite foundation with geogrid reinforced cushion (RFPCFGRC) has its advantage of its economics. Piles play an important role in rigid flexible pile composite foundation with geogrid reinforced cushion. The bearing mechanics of RFPCFGRC is more complicated than that of pile-supported reinforced embankments because of addition of flexible piles. This paper discussed the diffence and the bearing mechanics of the two types of composidte foundation. The results show that addition of flexible piles has changed bearing mechanics of composite foundation and changes the load distribution among piles and soil. Soil arching degree of RFPCFGRC is larger than that of pile-supported reinforced embankments.

Numerical Analysis for Bearing Performance of Flexible Piles Composite Foundation Influenced by Modulus’ Changes

2011 ◽  
Vol 261-263 ◽  
pp. 1694-1698 ◽  
Author(s):  
Feng Yi Tan ◽  
Xin Zhi Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Frictional Resistance ◽  
Composite Foundation ◽  
Single Pile ◽  
The Finite Element Method ◽  
Modulus Ratio ◽  
The Common ◽  
Flexible Pile

The bearing performance of composite foundation improved by flexible piles was influenced by changes of cushion’s modulus, the modulus ratio between soil on bottom of pile and soil surrounded pile, which was analyzed by the finite element method. Results showed that: 1.For single pile, by increasing of cushion’s modulus, the bearing performance nearby the top of flexible pile increased apparently, and the common tendency of settlement of pile and soil surrounded piles was affected negatively. For multi-piles, the increasing of cushion’s modulus resulted in the increasing of bearing performance and the common tendency of settlement of piles and soil surrounded piles was affected positively. 2.The change of modulus ratio between soil surrounded piles and soil on bottom of piles resulted positively in the change of frictional resistance and end-bearing performance nearby the bottom of single pile and reduced the settlement of composite foundation. But the multi-pile borne absolutely all loading due to the increasing of modulus ratio, and both of piles and soil surrounded piles had the same tendency of settlement.

Analysis of Behavior of Composite Foundation with Sparse Pile to Control Settlement

2012 ◽  
Vol 204-208 ◽  
pp. 674-679
Author(s):  
Jun Hui Zhang ◽  
Zhi Yong Yin ◽  
Jian Long Zheng
Keyword(s):  
Load Transfer ◽  
Computer Code ◽  
Differential Settlement ◽  
Composite Foundation ◽  
Soil Arching ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Rapid Construction ◽  
Membrane Effect ◽  
Pile Cap

The composite foundation with sparse piles to control settlement has been used to rapid construction and strict deformation of the structure widely currently, which can enhance the efficient of load transfer and decrease the differential settlement used with the geosynthetic. Considering the confine of analytical solution and the traditional method with a changeless modulus of geosynthetic and pile, the effects of the height of fill, the elastic modulus of geosynthetic and pile material on the differential settlement, embankment soil arching effect and tensioned membrane effect etc. are investigated using the computer code ABAQUS in this paper. The results indicate that the modulus of geosynthetic and pile has a notable influence on the differential settlement and the arching effect, which should be considered in the design. At the same time, the maximum tension in geosynthetic occurs near the edge of the pile cap.

Comparative Analysis of Different Types of Rigid-Pile-Reinforced Embankments

2013 ◽  
Vol 712-715 ◽  
pp. 845-849
Author(s):  
Wen Feng Huang ◽  
Hai Hong Mo ◽  
Ying Guang Fang
Keyword(s):  
Comparative Analysis ◽  
Bending Moment ◽  
Composite Foundation ◽  
Shearing Force ◽  
Pile Head ◽  
Rigid Pile ◽  
Different Types ◽  
Reinforced Embankments ◽  
Piled Embankments

Due to the fact that the large bending moment and shearing force distributes at the upper-side pile of the available piled embankments when the embankment fill is thick, a rigid grid-pile composite foundation is presented. Using a comparative analysis, the force behaviors for the middle pile, side pile and geogrid in different types of rigid-pile-reinforced embankments are investigated. The research shows that the tension distributing in geogrid decreases by the setting of the pile head or the rigid grid. The setting of the rigid grid contributes obviously to decreasing the bending moment and shearing force at the upper-side pile.

Study on Bearing Mechanism of Long-Short-Pile Composite Foundation under Rigid Foundation

2014 ◽  
Vol 638-640 ◽  
pp. 570-573
Author(s):  
Shuang Bin Qian ◽  
Li Hua Zhang
Keyword(s):  
Load Distribution ◽  
Stress Ratio ◽  
Ground Improvement ◽  
Composite Foundation ◽  
Rigid Foundation ◽  
Foundation Soil ◽  
Negative Skin Friction ◽  
Friction Resistance ◽  
Composite Pile ◽  
Side Friction

Long-short composite pile is a widely used ground improvement technique. This study presents the results of finite difference analyzes using FLAC3D software to investigate the load-bearing and bearing mechanism of long-short pile composite foundation under rigid foundation. The pile-soil load-sharing ratio and stress ratio, axial force distribution in the piles, and pile side friction resistance distribution characteristics are also studied. The results showed that due to negative skin friction of pile in composite foundation soil functions are fully utilized. On the other hand, the load distribution between piles and subsoil is significantly affected by the cushion.

Research of Load-Bearing and Deformation Characteristics of Long-Short Pile Composite Foundation

2012 ◽  
Vol 256-259 ◽  
pp. 592-595
Author(s):  
Shuang Bin Qian ◽  
Li Hua Zhang
Keyword(s):  
Load Distribution ◽  
Stress Ratio ◽  
Ground Improvement ◽  
Composite Foundation ◽  
Load Bearing ◽  
Friction Resistance ◽  
Load Distributions ◽  
Settlement Behavior ◽  
Composite Pile ◽  
Side Friction

Long-short composite pile is a widely used ground improvement technique. This study presents the results of finite difference analyzes using FLAC3D software to investigate the load-bearing and deformation behavior of long-short pile composite foundation under various load distributions. The pile-soil load-sharing ratio and stress ratio, axial force distribution in the piles, pile side friction resistance distribution, and settlement behavior are also studied. The results show that settlement is much more significantly affected by long-pile rather than short-pile. On the other hand, the load distribution between piles and subsoil is significantly affected by the cushion.

Analysis of Settlement of Composite Foundation with Sparse Pile to Control Settlement

2012 ◽  
Vol 204-208 ◽  
pp. 664-669
Author(s):  
Jun Hui Zhang ◽  
Zhi Yong Yin ◽  
Jian Long Zheng
Keyword(s):  
Elastic Modulus ◽  
Significant Influence ◽  
Computer Code ◽  
Differential Settlement ◽  
Composite Foundation ◽  
Soil Arching ◽  
Maximum Settlement ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Pile Cap

The embankment soil arching effect of the composite foundation with sparse piles to control settlement is caused by the differential settlement between the embankment fill and the piles. So, the settlement is an important behaviour of the composite foundation. The effects of the height of embankment, the elastic modulus of geosynthetic and pile material, the stiffness of cushion and substratum, the pile cap and the distance of piles on the settlement are investigated using the computer code ABAQUS in this paper. The results indicate that the maximum settlement and differential settlement decrease with the elastic modulus of geosynthetic, the stiffness of cushion and substratum. The maximum settlement decreases and the differential settlement increases with the elastic modulus of pile material. At the same time, the differential settlement of the embankment surface decreases with the height of fill and there will be an equal settlement plane when the fill reaches certain height. In addition, the distance of piles has a more significant influence on settlement than the dimension of pile cap.

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