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设置过渡层的半刚性基层沥青路面的合理结构

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Keywords: 道路工程,沥青路面,半刚性基层层位,级配碎石,沥青碎石,力学响应

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Abstract:

针对半刚性基层在沥青路面使用过程引起的裂缝破坏,使其在高等级公路中的适用性受到质疑的问题,通过设置级配碎石和沥青碎石过渡层使半刚性基层的层位实现向下放置,实现了改善半刚性基层受力和减少裂缝的目的。采用ANSYS计算设置不同厚度的级配碎石和沥青碎石过渡层,分析路面结构在荷载作用下基层厚度变化时轮隙中心的受力情况,以考察适宜的半刚性基层层位和厚度。力学分析结果表明采用厚度为12~15cm的级配碎石层和厚度为25~35cm的半刚性基层、或设置厚度为10~15cm的沥青碎石层和厚度为20~30cm的半刚性基层这两种结构,完全可以满足控制路面结构开裂的指标要求;能减少路面结构出现裂缝,延长沥青路面的结构寿命。

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