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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2014  >  14(5): 8-18
QIU Yan-jun, LIU Yu-liang, YANG En-hui, XIANG Ke-ming. Centrifugal model test and numerical simulation of pressure grouting in subgrade retrofitting[J]. Journal of Traffic and Transportation Engineering, 2014, 14(5): 8-18.
Citation: QIU Yan-jun, LIU Yu-liang, YANG En-hui, XIANG Ke-ming. Centrifugal model test and numerical simulation of pressure grouting in subgrade retrofitting[J]. Journal of Traffic and Transportation Engineering, 2014, 14(5): 8-18.
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Centrifugal model test and numerical simulation of pressure grouting in subgrade retrofitting

  • 1.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 3.

    China Railway 16th Bureau Group Co., Ltd., Beijing 100081, China

  • 4.

    Sichuan Transportation Investment Group Co., Ltd., Chengdu 610041, Sichuan, China

More Information
  • Author Bio:

    QIU Yanrjun (1966-), male, professor, PhD, +86-28-87634347, publicqiu@vip.163.com

  • Received Date: 2014-04-11
  • Publish Date: 2014-10-25
    Abstract
  • In the practice of pressure grouting in subgrade retrofitting project of Mianyang-Guanyuan Highway, field monitoring, centrifugal model test and numerical simulation were carried out to study the technical process and the influencing factors of pressure grouting in subgrade disease.It is revealed that the geometrical property of subgrade section is the main reason to the differential settlement of subgrade, and then produces pavement premature failure such as longitudinal cracking.Centrifugal model test indicates that two-phase grouting method that with 0.2 MPa at the first stage and 0.4-0.5MPa at the second stage is recommended.The recommended reasonable space between grouting holes is 2.0 m.Economy should be considered in the practice for choosing reasonable concrete mix proportion and maintenance time.Numerical simulation result shows that there are three stages for pressure grouting, such as stress accumulation stage, cracking extension stage and crack widening stage.The pressure for soil splitting increases with the increases of homogeneity and soil strength.

     

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