冲击荷载作用下有隔离层的水泥混凝土路面板动态响应模拟试验研究

Simulation Tests and Research on Dynamic Response of Cement Concrete Pavements with Different Bond-breaking Layers to Impact Loading

选择土工布、橡胶板作为水泥混凝土路面隔离层,通过室内模拟水泥混凝土路面冲击振动试验,借助微地震测试系统,测定了室内不同隔离层混凝土面板与基层板振动特性,初步获得了冲击荷载作用下隔离层对水泥混凝土面板与基层板的振动响应影响规律。振动响应试验结果表明,无隔离层时面层板振动速度峰值最大,其次是一层土工布,橡胶板作隔离层时面层板振动速度峰值最小;无隔离层面层板振动位移峰值最大,其次是两层土工布,橡胶板振动位移峰值最小。基层板在冲击荷载作用下,由于面层和隔离层的阻尼作用,基层振动速度峰值和位移峰值大幅度减小。4种工况下,无隔离层时基层板振动速度峰值和振动位移峰值均最大;按照振动速度峰值和振动位移峰值从大到小排序均为无隔离层、橡胶板、一层土工布、两层土工布。这些研究所获得的不同隔离层水泥混凝土路面板振动特性规律与方法,可为进一步研究隔离层水泥混凝土路面动力响应提供方法与理论参考。

This research explores the mechanisms for buffering vibration and impact of pavements with different bond-breaking layers via the vibration isolation model. Geotextile, rubber sheet and curing agent are used as the bond-breaking layers between the pavement surface slabs and the bases. The indoor simulated impact and vibration tests and the micro-seismic testing system are adopted to characterize the vibration of concrete pavement surface slabs and bases with different bond-breaking layers. And the vibration response law of cement concrete pavement with different bond-breaking layers is originally obtained. The findings from the vibration response tests indicated that. （1） the surface slab without bond- breaking layer beneath has the highest maximum vibration velocity, followed by the surface slab atop single layer of geotextile as the bond-breaking layer, while the surface slab atop the rubber sheet as the bond-breaking layer having the lowest value; （2） the surface slab without bond-breaking layer beneath has the highest maximum vibration displacement, followed by the surface slab atop double layers of geotextile as the bond-breaking layer, while the surface slab atop the rubber sheet as the bond-breaking layer having the lowest; （3） for the bases under impact loading, their maximum vibration velocity and vibration displacement are reduced significantly compared to the surface slabs, thanks to damping imposed by the surface slabs and the bond-breaking layers atop; and （4） the base without bond-breaking layer atop has the highest maximum vibration velocity and maximum vibration displacement, in turn followed by the bases beneath the rubber sheet, single layer of geotextile and double layers of geotextile as the bond-breaking layers respectively. The vibration law of cement concrete pavements with different bond-breaking layers characterized by this research offers theoretical and methodological reference to further study on dynamic response of cement concrete pavements with various bond-breaking layers.