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摘要: 为了分析简易机场的合理道面结构, 依托陕西西安、湖南耒阳的室内外试验段, 利用直径30cm刚性承载板模拟机轮荷载圆, 使用反力架、千斤顶及疲劳试验机, 通过人工和机械定点重复加载模拟飞机通行, 研究了薄层沥青混凝土面层+水泥稳定细粒土基(垫)层道面结构在重复荷载作用下的疲劳特性。试验结果表明: 推荐道面结构早期承载能力较高, 在60d龄期内, 整体回弹模量为200~300MPa, 弯沉小于1mm; 此时道面可承受飞机荷载几万至十几万次的起降通行而不破坏, 并保持良好的使用性能; 推荐道面结构的疲劳特性可以满足简易机场的应急使用需求。Abstract: In order to analyze the reasonable pavement structure of field airfield, indoor and outdoor trial roads were built in Xi'an of Shaanxi Province and Leiyang of Hunan Province, load circle induced by aircraft wheel was simulated by using rigid bearing plate with 30 cm diameter, the experimental equipments such as reaction frame, hoisting jack and fatigue machine were used, the taxiing of aircraft at the same point of the pavement was simulated through manual and mechanical repeated loadings, the fatigue characteristic of the pavement with thin asphalt concrete surface and cement stabilized fine grained soil base(or subbase) was studied. Experiment result shows that the early carrying capacity of the recommended pavement structure is better, holistic elastic modulus is between 200~300 MPa, and its deflection is less than 1 mm in 60 days. The structure has good using performance, and will not be destroyed after ten thousands to hundred thousands times of takeoff and landing of airplane. The fatigue characteristic of the structure can meet the emergency requirement of field airfield.
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图 1 西安人工加载累积塑性变形
Figure 1. Cumulative plastic deformations under manual loading in Xi'an
图 2 耒阳人工加载累积塑性变形
Figure 2. Cumulative plastic deformations under manual loading in Leiyang
图 3 西安试验机加载累积塑性变形
Figure 3. Cumulative plastic deformations undermechanical loading in Xi'an
图 4 西安试验机加载分级塑性变形
Figure 4. Grading plastic deformations under mechanical loading in Xi'an
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