Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (7): 1588-1597.doi: 10.13229/j.cnki.jdxbgxb20210143

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Consolidation characteristics and influencing factors of rigid pile-raft foundation of high-speed railway

Yong-hui SHANG1,2(),Lin-rong XU1,3(),Zhao-feng CHEN2   

  1. 1.School of Civil Engineering，Central South University，Changsha 410075，China
    2.Institute of Architecture and Engineering，Huanghuai University，Zhumadian 463000，China
    3.National Engineering Laboratory for High Speed Railway Construction，Central South University，Changsha 410075，China
  • Received:2021-02-21 Online:2022-07-01 Published:2022-08-08
  • Contact: Lin-rong XU E-mail:syhsrsci@sina.com;lrxu@csu.edu.com

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Abstract:

The typical unit of PHC rigid pile-raft composite foundation in high-speed railway is selected. Considering the undrained objective characteristics of rigid pile， the consolidation equations of soil in reinforcement area and underlying layer are established respectively， and the influence of foundation design parameters on consolidation characteristics is revealed in depth combining with examples. The results show that the consolidation of rigid pile-raft composite foundation has a time-varying effect. The filling period is mainly affected by the consolidation rate of the reinforcement area， and the resting period is mainly affected by the consolidation rate of the underlying layer. Design parameters such as replacement rate， relative reinforcement depth and pile-soil compression modulus ratio all have an impact on the consolidation rate of composite foundations， and the critical ranges are 0.03-0.06， 0.5-0.8 and 100-150， respectively. The rationality of the algorithm in this paper has been verified， and the research results can provide a theoretical basis for the design of rigid pile-raft composite foundations for high-speed railways in soft soil areas.

Key words: high speed railway, pile-raft composite foundation, consolidation characteristics, influencing factors

CLC Number: 

  • TU470

Fig.1

Simplified calculation model"

Fig.2

Stress analysis diagram"

Fig.3

Unit body flow diagram"

Fig.4

Equivalent double-layer foundation model"

Fig.5

Curve of time-additional stress"

Fig.6

Comparison curve"

Fig.7

Effect of replacement rates on consolidation rate"

Fig.8

Effect of reinforcement depth on consolidation rate"

Fig.9

Effect of compression modulus ratio of pile-soil"

Fig.10

Consolidation comparison of various parts"

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