Volume 23 Issue 1
Feb.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(1): 93-104
ZHANG Sha-sha, LIU Ya-chao, YANG Xiao-hua, LI An-hong, CHEN Wei-zhi, YU Ze-long, ZHAO Yan-hu. Deformation characteristics of cement stabilized macadam aggregate of high-speed railway in coarse-grained sulfate soil area[J]. Journal of Traffic and Transportation Engineering, 2023, 23(1): 93-104. doi: 10.19818/j.cnki.1671-1637.2023.01.007
Citation: ZHANG Sha-sha, LIU Ya-chao, YANG Xiao-hua, LI An-hong, CHEN Wei-zhi, YU Ze-long, ZHAO Yan-hu. Deformation characteristics of cement stabilized macadam aggregate of high-speed railway in coarse-grained sulfate soil area[J]. Journal of Traffic and Transportation Engineering, 2023, 23(1): 93-104. doi: 10.19818/j.cnki.1671-1637.2023.01.007
shu

Deformation characteristics of cement stabilized macadam aggregate of high-speed railway in coarse-grained sulfate soil area

doi: 10.19818/j.cnki.1671-1637.2023.01.007
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, Sichuan, China

  • 3.

    School of Civil Engineering and Built Environment, Liverpool John Moores University, Liverpool L3 3AF, Merseyside, UK

Funds:

National Natural Science Foundation of China 42101126

Natural Science Basic Research Program of Shaanxi Province 2019JM-147

Science and Technology Development Project of China Railway Group Limited 2017-major-11-04

Science and Technology Project of Qinghai Provincial Department of Transportation 2020-02

More Information
  • Author Bio:

    ZHANG Sha-sha(1982-), female, associate professor, PhD, zss_lx@126.com

  • Received Date: 2022-10-12
    Available Online: 2023-03-08
  • Publish Date: 2023-02-25
    Abstract
  • To explore the deformation characteristics and mechanisms of cement stabilized macadam aggregate at the culverts, bridges and other transition sections for high-speed railways under different working conditions in coarse-grained sulfate saline soil area, based on the material properties of solidified subgrade filler, the graded gravel with 0-2.5% salt content was used and mixed with different kinds and contents of cements, and the deformation characteristics tests with and without capillary water rising at normal temperature were carried out. Besides, the basic freeze-thaw cycle test of the solidified subgrade bed was performed, and the composition change was analyzed by the XRD test at the same time. Based on the test results, the typical test materials were selected to carry out the subgrade-structure model test subjected to the freeze-thaw cycle. Test results show that without capillary water supply, the deformation of the salt-bearing graded crushed stone sample prepared with ordinary cement can reach 4.2 times that of the sample mixed with 5% special cement. Particularly, with capillary water supply, the deformation of the ordinary cement mixed sample can reach 33.0 times that of the 5% special cement mixed sample. Under different salt contents, the minimum inhibition rate achieved by 3%-5% special cement stabilized graded crushed stone on the deformation reduction of corresponding ordinary cement working condition (caused by capillary water rising) is 60%-80%. Subjected to six basic freeze-thaw cycles, the final deformation of the sample with ordinary cement is 16.0 times that of the sample with high sulfate resistance cement. Under the freeze-thaw cycle condition, the maximum expansion deformation rate of stabilized macadam aggregate mixed with special cement is only 0.2% in subgrade-structure model test. In coarse-grained sulfate saline soil area, although the cement solidified subgrade filler reduces other deformations of subgrade, it is necessary to introduce special cement solidification and other engineering measures for high-speed railway and other projects with strict deformation control requirements because the surrounding salt factors are difficult to avoid and ordinary cement cannot fulfil the requirements of subgrade engineering in saline soil areas.

     

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