[1] Luo Qiqi, Yu Qian, Zhang Sheng, Ma Xinyan, et al. Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt [J]. Journal of Southeast University (English Edition), 2024, 40 (3): 266-274. [doi:10.3969/j.issn.1003-7985.2024.03.006]

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Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

40

Issue:

2024 3

Page:

266-274

Research Field:

Traffic and Transportation Engineering

Publishing date:

2024-09-20

Info

Title:

Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt

Author(s):

Luo Qiqi¹;  Yu Qian²;  Zhang Sheng¹;  Ma Xinyan¹;  2;  Ye Xinyu¹;  3;  Du Yinfei¹;  3

¹School of Civil Engineering, Central South University, Changsha 410075, China
²Department of Geotechnical Engineering, China Airport Planning and Design Institute Co., Ltd., Beijing 100020, China
³Hunan Tieyuan Civil Engineering Testing Co., Ltd., Changsha 410075, China

Keywords:

pavement cushion;  silt subgrade;  wetting;  boundary effect;  mechanical response

PACS:

U416.2

DOI:

10.3969/j.issn.1003-7985.2024.03.006

Abstract:

Through a self-developed model test system, the mechanical properties of silt and the deformation characteristics of airport runways were investigated during the period of subgrade wetting. Based on the test results, the reliability of the numerical simulation results was verified. Numerical models with different sizes were established. Under the same cushion parameter and loading width ranges, the effects of the cushion parameters and loading conditions on the mechanical responses of the cushion before and after subgrade wetting were analyzed. The results show that the internal friction angles of silt with different wetting degrees are approximately 34°. The cohesion is from 8 to 44 kPa, and the elastic modulus is from 15 to 34 MPa. Before and after subgrade wetting, the variation rates of the cushion horizontal tensile stresses with the same cushion parameters and loading width ranges are different under the influence of boundary effects. After subgrade wetting, the difference in the variation rates of the cushion horizontal tensile stresses under the same cushion parameter range decreases compared with that before subgrade wetting; however, this difference increases under the same loading width range. Before and after subgrade wetting, the influence of the boundary effect on the mechanical response evaluation of the cushion is not beneficial for optimizing the pavement design parameters. When the cushion thickness is more than 0.25 m, the influence of the boundary effect can be disregarded.

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Memo

Memo:

Biographies: Luo Qiqi(1992—), male, Ph.D. candidate; Ye Xinyu(corresponding author), male, doctor, associate professor, yexinyu113@csu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 52008401), the Natural Science Foundation of Hunan Province(No. 2021JJ40770), the Open Fund of Hunan Tieyuan Civil Engineering Testing Co., Ltd.(No. HNTY2022K04).
Citation: Luo Qiqi, Yu Qian, Zhang Sheng, et al.Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt[J].Journal of Southeast University(English Edition), 2024, 40(3):266-274.DOI:10.3969/j.issn.1003-7985.2024.03.006.

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