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柔性基层在高寒地区沥青路面结构中的应用研究

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Keywords: 道路工程,柔性基层,断裂力学,反射裂缝,应力强度因子

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Abstract:

为了研究半刚性基层、沥青稳定碎石柔性基层、级配碎石柔性基层和应力吸收夹层在减缓高寒地区沥青路面的半刚性材料层反射裂缝方面的不同效果,采用断裂力学理论和有限元技术,对半刚性材料层已有裂缝的4种路面结构进行了在车辆荷载和高寒地区的骤然降温综合作用下的热-力耦合分析。从应力强度因子和疲劳寿命两方面,开展了上述4种路面结构对反射裂缝在沥青面层中的扩展行为影响的对比研究。结果表明,在沥青混凝土路面的面层和半刚性材料层之间设置的柔性基层和应力吸收夹层可大幅度减缓反射裂缝的扩展速度,从而延长路面使用寿命,并按照沥青稳定碎石柔性基层、级配碎石柔性基层、应力吸收夹层、半刚性基层的顺序依次递减。

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