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为了研究水泥混凝土路面冰冻损伤机理,对混凝土材料的微观结构进行了研究,并对水泥混凝土路面温度场进行了有限元分析。基于应力场、多孔体系渗流场和温度场的多物理场耦合理论,利用Comsol软件,对水泥混凝土路面内部结冰的现象进行了数值模拟。根据不同的降温速率、孔隙率、渗透系数和孔隙累积分布函数,设计了4组模型,每组4个模型进行对比。计算了结冰对路面造成的应力和应变,得到了参考点的应力和应变随温度变化的曲线图。结果表明,降温速率越快、孔隙率越大、渗透系数越小;相同孔隙率情况下,小孔隙占的比例越多,冰冻对路面的损伤就越大。
In order to study the freezing damage mechanism of cement concrete pavement, the microstructure of concrete material was studied, and the temperature field of cement concrete pavement was analyzed by finite element method. Based on the multi-physics coupling theory of stress field, seepage field and temperature field of porous system, the phenomenon of icing in cement concrete pavement was simulated by Comsol software. According to different cooling rate, porosity, permeability coefficient and pore cumulative distribution function, four groups of models were designed, and four groups of four models were compared. The stress and strain caused by icing on the pavement were calculated. The curves of stress and strain at reference point with temperature were obtained. The results show that the faster the cooling rate is, the larger the porosity is, and the smaller the permeability coefficient is. Under the same porosity, the larger the proportion of small pores, the greater the damage to the pavement.