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摘要: 分别运用美国联邦航空局(FAA)基于弹性层状体系理论的道面设计方法(LEDFAA)、中国民用机场水泥混凝土道面设计方法(APDMC)与PCI衰变模型, 建立了复合道面剩余寿命的预估方法, 比较了3种方法的预估结果及其适用性。计算结果表明: 3种预估方法确定的剩余寿命较为接近, 最大偏差为3.2 a, 最小偏差仅为0.1 a, 引起偏差的原因在于不同预估模型采用的控制指标不同。基于LEDFAA设计方法的预估结果对土基模量很敏感, 基于APDMC设计方法的预估结果对混凝土的弯拉强度非常敏感, 而PCI能够全面地反映道面的使用性能, 因此, 在有足够历史数据的条件下, 采用PCI衰变模型预估道面的剩余寿命。Abstract: Based on elastic layer system theory design method of Federal Aviation Administration(LEDFAA), airport pavement design method of China(APDMC) and pavement condition index(PCI) regression model, three prediction methods of remaining life for composite pavement of airport were established, the prediction results and applicabilities of three methods were compared.Analysis result indicates that the remaining lives calculated by three methods are approximate, the maximum deviation is 3.2 a, the minimum deviation is 0.1 a, and the deviation is mainly induced by different control indices of three models.Remaining life is most sensitive to subgrade modulus and concrete flexural-tensile strength for the methods based on LEDFAA and APDMC respectively, PCI regression model is recommended on the condition of having sufficient historical data of pavement performance.
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Key words:
- airport engineering /
- composite pavement /
- remaining life /
- prediction method /
- pavement condition index
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表 1 年平均交通量
Table 1. Annual mean traffic volumes
机型 预测年平均起降架次 机型 预测年平均起降架次 A320 31 697 B767-200 5 994 A300-600 5 886 B777-200 3 024 A330 1 242 B737-800 1 134 A340-500/600 216 MD-82/88 4 734 B737-700 87 766 MD-90-30 8 928 B757 16 056 CRJ-200 8 046 B747-200 1 602 Y-8 2 412 
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表 2 各结构层的厚度折减
Table 2. Thickness correction of each structure layer
结构层 原始厚度/cm 折减系数 折减后厚度/cm 2005年加铺层 7.0 1.00 7.0 1998年加铺层 7.5 0.80 6.0 1991年加铺层 14.0 0.75 10.5 原水泥混凝土 43.0 0.70 30.1 块石 25.0 1.00 25.0 注: 1998年加铺工程中对跑道荷载作用范围内的基础实施了注浆加固, 故块石厚度不予折减。
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表 3 弹性模量和泊松比
Table 3. Elastic moduli of elasticity and Poisson's ratios
结构层 2005年、1998年沥青混凝土 1991年沥青混凝土 水泥混凝土 块石 土基 弹性模量/MPa 1 385 981 27 600 280 25 泊松比 0.35 0.35 0.15 0.35 0.40
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表 4 剩余寿命预估结果
Table 4. Prediction result of remaining life
计算飞机 A300-600 当量计算飞机年运行架次Ns 40 912 计算飞机轮印长度Lt/cm 53.88 计算飞机轮印宽度Wt/cm 32.33 跑道通行宽度T/m 11.4 当量计算飞机年作用次数Ys 3 481 混凝土板底最大弯拉应力frm/MPa A点 3.327 B点 3.122 C点 3.362 混凝土弯拉强度fcm/MPa 5.5 计算飞机剩余累计作用次数Ne(C点) 22 125 道面剩余寿命y/a 6.4
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