Experimental and Numerical Study on Response Characteristics of Airport Pavement Subjected to Wetting in Silt Subgrade
Experimental and Numerical Study on Response Characteristics of Airport Pavement Subjected to Wetting in Silt Subgrade
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DOI：
10.1007/s12205-022-0647-7
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发表时间：
2022-11
影响因子：
2.2
通讯作者：
Qiqi Luo;Xinyu Ye;Qiang Li;Shenmin Zhang;Qian Yu;Xin-yan Ma
中科院分区：
文献类型：
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作者：
Qiqi Luo;Xinyu Ye;Qiang Li;Shenmin Zhang;Qian Yu;Xin-yan Ma
在西北、华北地区，常选用粉土作为填筑土。在机场使用期间，“锅盖效应”或降雨入渗容易造成机场局部湿化。湿化条件下飞机荷载作用下路面的响应特性是探索路面损伤演化规律的基础。为研究不同路面参数在湿化条件下的响应特性，自行开发了模型试验系统，并建立了经过验证的数值模型。分析了不同路面参数下路面板间的相互作用机理，以及湿化对路面加载区力学响应的影响。结果表明，竖向变形的增大主要取决于粉土的持水能力，荷载作用下的竖向变形受路面参数的影响较小。基层弹性模量对路面层底剪应力峰值及因湿化而增加的剪应力峰值影响较大。对于水泥混凝土路面，接缝传荷能力的提高并不能减少湿化引起的峰值应力的增加，包括水平应力和剪应力。节点传力能力的提高可以减小表层的应力集中，而表层的弹性模量对其影响不大。对于沥青路面，可以得到最佳的基层参数，以降低峰值应力和路基湿化引起的峰值应力的增加。研究结果可为机场道面结构设计、优化及病害处理提供技术依据。
Silt is often selected as the filling soil in Northwest and North China. “Pot cover effect” or rainfall infiltration are easily to cause localized wetting during the service period of airport. The response characteristics of pavement derived from aircraft loading under wetting condition are the basis to explore the evolution law of pavement damage. To investigate this response characteristics for different parameters of pavement under wetting condition, a self-developed model test system was developed, and the verified numerical model was then established. The interaction mechanisms of pavement slabs, and the influence of wetting on mechanical response in loading area of pavement under different pavement parameters were analyzed. The results showed that the increased vertical deformation depends on water-holding capacity of silt, and the vertical deformation under loading is little affected by pavement parameters. The peak shear stress and the increased peak shear stress derived from wetting at the bottom of pavement layers are largely influenced by elastic modulus of base course. For cement concrete pavement, the increase in load transfer capacity of joints cannot decrease the increase of peak stress, including horizontal stress and shear stress, derived from wetting. The increase in load transfer capacity of joints can decrease the stress concentration in surface layer, while the elastic modulus of surface layer has little influence. For bituminous pavement, optimal parameters of base course can be obtained to decrease the peak stress and the increase of peak stress derived from wetting in subgrade. The research can provide technical basis for the structure design, optimization, and disease treatment of pavement in airport engineering.