Model test on grouting improvement of graded gravel in surface layer of subgrade

Zhi Hong Nie, Yuan Liu, Cheng Ping Luo, Xiang Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In order to solve the frost heave problem in subgrade of passenger dedicated line in cold region, a graded gravel model was grouted by using grouting pump and vacuum pump to obtain the grouting parameters. Electron microscope scanning, penetration test and freeze-thaw cycle test were carried out to verify the frost heave effect of graded gravel after grouting improvement. The results show that when the viscosity of slurry reaches to 2.50 MPa·s, the groutability of slurry can meet the requirement of grouting test. The graded gravel after grouting is well bounding with the slurry and the permeability of the samples decreases from 6.8×10-3 cm/s to 1.4×10-10 cm/s. The permeability of graded gravel reduces significantly after grouting improvement. The maximum frost heave ratio is 0.25%, which meet the requirement of the uneven deformation in subgrade of passenger dedicated line. The model test demonstrates that the permeability and frost heave ratio can be effectively improved by grouting, which provides a reference for field grouting test of graded gravel in surface layer of subgrade.

Original languageEnglish
Pages (from-to)48-53
Number of pages6
JournalChang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition)
Issue number4
Publication statusPublished - 1 Jul 2015
Externally publishedYes


  • Frost heave
  • Graded gravel
  • Improvement by grouting
  • Model test
  • Permeability
  • Road engineering

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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