设置过渡层的半刚性基层沥青路面的合理结构

Rational composition of semi-rigid asphalt pavement based on setting transition layer

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。

According to the crack failure of semi-rigid base during its using process, the applicability of semi-rigid base in high grade highway was queried. The aims of improving force and reducing crack were achieved by the means of setting graded broken stone layer and asphalt macadam layer. The ANSYS software was used to investigate the suitable semi-rigid base horizon and depth, the forces of wheel clearance center was analyzed when the depth changes under different loads through setting different depths of graded broken stone layer and asphalt macadam layer. The mechanical analysis results show that the requirement of controlling crack can be completely satisfied by setting the graded broken stone layer with thickness from 12 to 15 cm and the semi- rigid base with thickness from 25 to 35 cm, or the asphalt macadam layer with thickness from 10 to 15 cm and the semi-rigid base with thickness from 20 to 30 em. This method can obviously reduce the cracks and prolong the pavement life. 2 tabs, 6 figs, 15 refs.