Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load

SHAO Guoxia; SU Qian; CHEN Shangyong; BAI Hao; WANG Wubin

doi:10.3969/j.issn.0258-2724.2017.01.005

Volume 30 Issue 1

Jan. 2017

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Journal of Southwest Jiaotong University > 2017 > 30(1): 30-37.

SHAO Guoxia, SU Qian, CHEN Shangyong, BAI Hao, WANG Wubin. Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load[J]. Journal of Southwest Jiaotong University, 2017, 30(1): 30-37. doi: 10.3969/j.issn.0258-2724.2017.01.005

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SHAO Guoxia, SU Qian, CHEN Shangyong, BAI Hao, WANG Wubin. Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load[J]. Journal of Southwest Jiaotong University, 2017, 30(1): 30-37. doi: 10.3969/j.issn.0258-2724.2017.01.005

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Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load

doi: 10.3969/j.issn.0258-2724.2017.01.005

Received Date: 18 Jun 2015
Publish Date: 25 Feb 2017

Abstract

Abstract

To study the pile-raft foundation in thick soft clay ground, total settlements of foundation surface, layered settlements, lateral deformations, and pore water pressures of foundation soil for pile-raft foundation and natural foundation were observed and analyzed by long-time in-situ test. The load and deformation mechanism of pile-raft foundation under flexible load was proposed by the comparative analysis of the deformation differences between the two types of foundations. The results show that the total settlement of pile-raft foundation is reduced to be the 24% total settlement of the natural foundation, and the differential settlement is reduce to be 0.9%. This means that the pile-raft foundation has lager integral rigidity, which can homogenize the load and restrict the lateral deformation, and lead to the reduction in the total settlement and differential settlement. The settlement of the pile-raft foundation in substratum is the main part of total settlement, which accounts for the 90% total settlement. The pile-raft structure bears the most subgrade load. Compared with that of the natural foundation, the excess pore water pressure of the pile-raft foundation is reduced by about 70%; therefore, the settlement of foundation is reduced.
- flexible load,
- pile-raft foundation,
- long-time in-situ test,
- deformation mechanism,
- excess pore water pressure

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References

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Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load

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