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在常规二参数σ-N应力-疲劳寿命幂函数模型基础上引入应力疲劳阀值参数σr,建立三参数应力-疲劳寿命幂函数模型。通过对半刚性基层水泥稳定碎石和水泥稳定砂砾两种材料的劈裂疲劳试验,利用三参数应力-疲劳寿命幂函数模型对试验结果进行分析并求得应力疲劳阀值。结果表明,在低应力条件下,半刚性基层材料存在应力疲劳阀值,为长寿命沥青混凝土路面设计提供了理论依据。
Based on the conventional two-parameter σ-N stress-fatigue life power function model, the stress fatigue threshold parameter σr is introduced to establish a three-parameter stress-fatigue life power function model. Through the splitting fatigue test of two kinds of materials of semi-rigid basement cement stabilized gravel and cement stabilized gravel, the three-parameter stress-fatigue life power function model was used to analyze the test results and calculate the stress fatigue threshold. The results show that under low stress conditions, the semi-rigid base material has stress fatigue threshold, which provides a theoretical basis for long-life asphalt concrete pavement design.