Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt
粉土湿化作用下边界效应对垫层力学响应试验的影响作者机构：School of Civil EngineeringCentral South UniversityChangsha 410075China Department of Geotechnical EngineeringChina Airport Planning and Design Institute Co.Ltd.Beijing 100020China Hunan Tieyuan Civil Engineering Testing Co.Ltd.Changsha 410075China
出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)
年 卷 期：2024年第40卷第3期
页 面：266-274页
核心收录：
学科分类：08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程]
基 金：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)
主 题：pavement cushion silt subgrade wetting boundary effect mechanical response
摘 要：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.
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