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摘要: 通过沥青混合料小梁的室内二级荷载疲劳试验, 模拟旧路沥青面层材料加铺前和加铺后的疲劳损伤特性。运用混凝土材料等效损伤理论, 进行了半刚性基层荷载作用次数在加铺前后的换算, 系统地提出了包括旧路面层和基层的剩余寿命预估、加铺层设计和验算在内的沥青加铺层设计方法, 并采用此方法对山东省东港高速公路加铺结构进行设计。分析结果表明: 初拟结构一、二的疲劳寿命都能满足交通量的要求, 但是考虑到经济因素以及各结构层疲劳寿命与交通量的协调性, 建议采用12cm LSPM-25的结构二作为东港高速公路的加铺结构。Abstract: The fatigue performances of old asphalt pavement before and after overlay were simulated by asphalt mixture fatigue tests with two-amplitude load in laboratory. The theory of equivalent damage was used to make conversion from the loading frequencies of old base course before overlay to that after overlay. The formula was founded to forecast the remnant lives of old pavement surface and base course after overlay. Overlay design method considering remnant life of old pavement and checking computation of overlay construction were proposed. The method was applied in maintenance of Donggang Expressway in Shandong Province. Analysis result indicates that the overlay fatigue lives of the two structures both meet the requirement of traffic volume of Donggang Expressway. Considering economic benefits and the harmony between traffic volume and overlay fatigue life, the second overlay structure with twelve centimeters LSPM-25 is more suitable for Donggang Expressway.
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表 1 沥青混合料级配
Table 1. Gradations of asphalt mixture
级配 各筛孔(mm)的通过百分率/% 31.5 26.5 19 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 AC-25 100 95 83 74 61 55 38 29 23 16 11 8 5 AC-20 100 100 95 85 72 61 40 42 23 16 11 8 5 AC-16 100 100 100 95 84 70 48 34 25 17 12 9 6 
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表 2 沥青技术性能
Table 2. Physical indices of asphalt
指标 25 ℃针入度/0.1mm 软化点/℃ 15 ℃延度/cm 15 ℃密度/(g·cm-3) shell70# 68.1 49.1 > 200 1.032 规范值 60~80 > 43 ≥100 实测
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表 4 旧路面层剩余寿命
Table 4. Remnant lives of surface in old pavement
结构类型 LSPM层厚/cm 12 14 结构一 加铺后层底拉应变/με 上面层 35.60 33.57 下面层 42.81 40.45 加铺后剩余寿命/次 上面层 2.90×109 2.90×109 下面层 1.15×109 1.37×109 结构二 加铺后层底拉应变/με 上面层 42.14 39.94 下面层 52.81 48.44 加铺后剩余寿命/次 上面层 1.64×109 1.64×109 下面层 5.99×108 7.83×108
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表 5 旧路半刚性基层剩余寿命
Table 5. Remnant lives of semi-rigid base course in old pavement
旧路 加铺前基层底拉应力/Pa 141 600 加铺前基层寿命/次 4.93×107 LSPM层厚/cm 12 14 结构一 加铺后基层底拉应力/Pa 81 950 77 420 加铺后基层剩余寿命/次 2.98×1010 4.84×1010 结构二 加铺后基层底拉应力/Pa 105 100 98 820 加铺后基层剩余寿命/次 2.47×109 4.85×109
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