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Study on Bearing Behavior and Optimum Design of Rigid-pile Composite Foundation

Author: ChenWeiChao
Tutor: YangGuangHua
School: South China University of Technology
Course: Geotechnical Engineering
Keywords: Rigid pile composite foundation Failure mode Cushion Joint action Settlement control design
CLC: TU473.1
Type: Master's thesis
Year: 2011
Downloads: 203
Quote: 0
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Abstract


Rigid pile composite foundation has been widely used , its essence is to pile soil shared load , but due to the current design theory does not accurately reflect the nature of that calculation methods are inadequate . Therefore , it is necessary to conduct further studies on rigid pile composite foundation bearing behavior of pile - soil interaction . With the help of finite difference numerical simulation software to establish a three-dimensional model of single pile rigid pile composite foundation , a common failure mode analysis of rigid pile composite foundation and pile bearing capacity of soil to play the law . The analysis showed that the common failure mode for friction pile composite foundation pile occurs first piercing damage , and subsequent composite foundation overall damage . Working load bearing capacity of rigid pile play may be greater than the bearing capacity value , the safety factor of the rigid pile may be lower than expected in the design safety factor , but this does not affect the overall safety of the composite foundation . This article also pointed out that the pile bearing capacity of soil play with the top of the pile and the pile tip piercing , piercing the greater the amount of pile reinforcing the higher level of play . Based on different soil rigid pile composite foundation bearing characteristics proposed cushion thickness should be based on the foundation soil , especially the pile end soil to determine the soft foundation soil , the cushion can set thinner , or even no cushion . Also comparative analysis of the similarities and differences between rigid pile composite foundation and composite pile foundation analysis showed that both essentially no difference , whether laying cushion depending on the the foundation soil quality and safety requirements , engineering applications do not need to a clear distinction between the two . However, the design concept , both very different. Composite Pile Foundation will pile and soil as independent of each other , considering the pile -soil interaction , clear piles of soil share of the load . View of the composite pile foundation design compared to conventional rigid pile composite foundation design method is reasonable , state-of-the-art , we learn from the composite pile foundation design method proposed by rigid pile composite foundation settlement control optimization design method . The optimization design method has been applied to practical engineering , and achieved good results .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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