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为准确预测水泥混凝土路面板在早期裂缝情况下的疲劳寿命,帮助制定合理的维修计划、延长道路使用寿命,该文通过小梁四点弯拉及混凝土板疲劳加载试验,研究了混凝土断裂力学参数及疲劳行为,并对有裂缝混凝土板的疲劳寿命进行预测分析。试验研究和模型预测均表明:混凝土路面板早期开裂疲劳寿命或破损过程分为3个阶段,且板的疲劳断裂寿命远小于传统模型预测值;开放交通时间的早晚对板的疲劳寿命有至关重要影响。研究结果对于准确预测疲劳寿命和及时进行路面维修与裂缝处理具有实际意义。
In order to accurately predict the fatigue life of cement concrete pavement slabs under early cracking conditions and to help to develop reasonable maintenance plans and extend the service life of the road, four-point bending of trabecular plates and fatigue loading tests of concrete slabs were conducted to study the fracture mechanics parameters And fatigue behavior, and predict the fatigue life of cracked concrete slab. Experimental studies and model predictions indicate that the fatigue crack initiation or failure process of concrete pavement slab is divided into three stages, and the fatigue life of the slab is much shorter than that of the traditional model. The morning and evening open traffic time is critical to the fatigue life of the slab Significant influence. The research results have practical significance for accurate prediction of fatigue life and timely maintenance of pavement and crack treatment.