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我国北方地区的土石坝和水池的防渗沥青混凝土面板,常出现低温裂缝。因此,对沥青混凝土在低温条件下的温度应力疲劳进行实验研究很有必要.本项研究研制了适用于沥青混凝土低温低周大变形的弯曲疲劳试验机,进行了沥青混凝土在不同低温下的疲劳破坏性能试验。对试验结果用粘弹性理论和推广的应变区分法(SRP)和应变能区分法(SEP)进行了分析,首次得出了沥青混凝土的疲劳寿命与弯曲应力、应变和应变能的关系,并试用于实际工程的予测.
In northern China, earth-rock dam and pool seepage-proof asphalt concrete panels often show low temperature cracks. Therefore, it is necessary to study the temperature stress fatigue of asphalt concrete under low temperature conditions.This study developed a bending fatigue tester suitable for low temperature and low deformation of asphalt concrete, and carried out the fatigue of asphalt concrete at different low temperatures Destroy performance test. The test results were analyzed using the viscoelastic theory and the generalized strain differentiation (SRP) and strain energy differentiation (SEP) method. The relationship between fatigue life and bending stress, strain and strain energy of asphalt concrete was obtained for the first time. In the actual project of the forecast.