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为研究冻融交替季节冰劈效应对沥青混凝土路面表面裂缝扩展的作用,基于断裂力学方法,采用ABAQUS有限元分析软件建立了路面结构模型,分别研究了路表裂缝在冰劈效应、温缩效应及二者结合作用下的应力强度因子随缝隙内积水深度、裂缝宽度以及裂缝长度等影响因素的变化规律及其相互之间的Pearson相关系数。研究结果表明:冰劈效应下,裂缝内少量积水便能够导致较大的应力强度因子,并且应力强度因子随着积水深度的增加而增长,但增长幅度逐渐放缓;同时较大的裂缝宽度能够导致裂缝更快的扩展,而裂缝长度对应力强度因子影响十分微弱;在冰劈与温缩的联合作用下,应力强度因子与冰劈效应作用下的应力强度因子的Pearson相关系数达到0.99以上,而由温缩效应所导致的应力强度因子相对于冰劈效应并不明显。因此在工程实践中,必须尽快修复路表裂缝,避免其在冻融交替季节受到冰劈效应的危害,从而保护路面的正常使用状况,延长路面使用寿命。
In order to study the effects of alternating freeze-thaw season ice cracking on asphalt concrete pavement surface crack propagation, a pavement structure model was established by using ABAQUS finite element analysis software based on fracture mechanics method. The effect of road surface cracking on ice cracking, And the combination of the two under the influence of stress intensity factor with the water depth, crack width and crack length and other factors of variation and Pearson correlation coefficient between them. The results show that under the effect of ice cleavage, a small amount of water accumulation in the fracture can lead to a larger stress intensity factor, and the stress intensity factor increases with the increase of water depth, but the growth rate gradually slows down; at the same time, larger cracks Width can lead to faster crack growth, and crack length has only a slight effect on the stress intensity factor. Under the combined action of ice-splitting and temperature-shrinking, the Pearson correlation coefficient of stress intensity factor under the ice-splitting effect reaches 0.99 However, the stress intensity factor caused by the temperature-shrinking effect is not obvious compared with the ice-cleavage effect. Therefore, in engineering practice, cracks in road surface must be repaired as soon as possible to avoid being harmed by the ice-splitting effect in the alternate season of freezing and thawing so as to protect the normal use of the road surface and prolong the service life of the road surface.