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[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()
粉土湿化作用下边界效应对垫层力学响应试验的影响
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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
粉土湿化作用下边界效应对垫层力学响应试验的影响
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
罗其奇1;  余虔2;  张升1;  马新岩1;  2;  叶新宇1;  3;  杜银飞1;  3
1中南大学土木工程学院, 长沙 410075; 2民航机场规划设计研究总院有限公司岩土工程所, 北京 100020; 3湖南铁院土木工程检测有限公司, 长沙 410075
Keywords:
pavement cushion;  silt subgrade;  wetting;  boundary effect;  mechanical response
道面垫层;  粉土道基;  湿化;  边界效应;  力学响应
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.
采用自研的模型试验系统, 研究了道基湿化过程中粉土力学特性和机场跑道变形特征.依据试验结果验证了数值模拟结果的可靠性, 并建立了不同尺寸的数值模型.在相同垫层参数和荷载宽度区间条件下, 研究了道基湿化前后边界效应对垫层力学响应的影响.结果表明, 不同湿化程度粉土内摩擦角接近34°, 黏聚力为8~44 kPa, 弹性模量为15~34 MPa.道基湿化前后, 受边界效应影响, 相同垫层参数和荷载宽度区间下垫层水平拉应力的变化率并不相同.道基湿化后, 相同垫层参数区间下垫层水平拉应力变化率差异较湿化前减小, 相同荷载宽度区间下变化率差异却有所增加.道基湿化前后边界效应对垫层应力响应评估的影响不利于道面设计参数优化.垫层厚度大于0.25 m时, 可忽略边界效应的影响.

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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.
Last Update: 2024-09-20