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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(6): 71-81
ZHANG Sha-sha, WANG Xu-chao, YANG Xiao-hua, CHEN Wei-zhi, ZHOU Qiang. Cumulative effect of saline construction water on engineering properties of subgrade filling material[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 71-81. doi: 10.19818/j.cnki.1671-1637.2020.06.006
Citation: ZHANG Sha-sha, WANG Xu-chao, YANG Xiao-hua, CHEN Wei-zhi, ZHOU Qiang. Cumulative effect of saline construction water on engineering properties of subgrade filling material[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 71-81. doi: 10.19818/j.cnki.1671-1637.2020.06.006
shu

Cumulative effect of saline construction water on engineering properties of subgrade filling material

doi: 10.19818/j.cnki.1671-1637.2020.06.006
  • 1.

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

  • 2.

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

Funds:

National Natural Science Foundation of China 41807245

Major Scientific Research Project of the China Railway Group 2017-major-11-04

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

Fundamental Research Funds for the Central Universities 300102219219

More Information
  • Author Bio:

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

  • Received Date: 2020-06-09
  • Publish Date: 2020-06-25
    Abstract
  • Large-scale compression tests, salt expansion tests, and collapsibility tests were performed under the conditions of construction water with different salt addition times and types for gravelly sulfate saline soil with different sulfate salt contents. Test preparation was based on the site investigation, and samples with different types and times of saline construction water were prepared. The variation characteristics of deformation over time were observed under the condition of a 400-kPa load, single-time temperature decrease, and adding water, respectively. The influence mechanism of adding multiple times of saline construction water on the engineering properties of gravelly sulfate saline soil was analyzed. Research results show that the compression deformation of gravelly sulfate saline soil first increases and then gradually stabilizes as the times of saline construction water increases. The compression modulus shows a typical three-stage variation law, which is independent of the type of saline construction water. Under the influence of cooling, with the gradual addition of sulfate-containing construction water, the salt expansion of gravelly sulfate saline soil tends to become stable after an obvious increase, and the maximum dilatation increases by 7.9 times. The addition of chlorine-containing construction water decreases the salt expansion and then gradually stabilizes. The ultimate salt expansion was only 1/13 that of the original saline soil. Moreover, the addition of saline construction water has an obvious cumulative effect on the salt expansion characteristics of gravelly sulfate saline soil. With the increasing times of saline water additions, the collapse deformation of soil samples shows a rule of accumulation. Therefore, even if the salt content in construction water from a saline area is low, the cumulative effect from multiple uses of construction saline water is obvious and will have a negative influence on the subgrade engineering characteristics. Preventive measures should be taken during the construction process.

     

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