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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) 2024年第3期40卷 266-274页

作者： Luo Qiqi Yu Qian Zhang Sheng Ma Xinyan Ye Xinyu Du Yinfei School of Civil Engineering Central South UniversityChangsha 410075China Department of Geotechnical Engineering China Airport Planning and Design Institute Co.Ltd.Beijing 100020China Hunan Tieyuan Civil Engineering Testing Co. Ltd.Changsha 410075China

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 *** on the test results,the reliability of the numerical simulation results was *** models with different sizes were *** 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 *** 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 *** 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 *** 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 *** 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 *** the cushion thickness is more than 0.25 m,the influence of the boundary effect can be disregarded.

关键词： pavement cushion silt subgrade wetting boundary effect mechanical response

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