旧水泥混凝土路面搭板罩面的应力

采用沥青罩面处理旧水泥混凝土路面时,沥青罩面层底对应旧路接裂缝的位置会因为应力集中而开裂.提出将旧板接裂缝顶部拓宽再采用水泥混凝土搭板来处理接裂缝,然后进行沥青罩面的方法,称为搭板罩面法.采用二维有限元方法分析了搭板罩面法处理旧水泥混凝土路面的影响因素,这些因素包括搭板厚度、搭板宽度、搭板强度以及搭板与旧水泥混凝土接头部位结合强弱.计算结果表明,接头顶端和裂缝顶端的应力随着搭板厚度的减小、搭板宽度的减小以及搭板的强度的减小而减小,而随着搭板与旧水泥混凝土板之间的接头处的结合由弱变强,接头顶端和裂缝顶端应力的变化趋势却相反.分析表明搭板设计需要综合考虑多方面的因素.

Stress of asphalt overlay laying on cracked concrete pavement repaired with bridging slab

Cracking due to stress concentrating at the bottom of asphalt overlay corresponding to joint peak and crack peak in concrete will happen when asphalt overlay is laid on cracked concrete. This paper presents bridging slab and asphalt overlay method that is to widen the top of joint and crack and then fill with new concrete and overlaying with asphalt concrete. The factors that influence the stress in asphalt overlay laying on cracked concrete slab repaired with bridging slab are analyzed with 2-D FEM, which include the width of bridging slab, the thickness of bridging slab, the strength of bridging slab and the bond strength between bridging slab and old concrete slab. The calculating results indicate that the stress of the joint peak and crack peak decreases with the decrease of the thickness, the width and the strength of bridging slab. Whereas the stress developing tendency of the joint peak with the bond strength between bridging slab and concrete slab in the two peak points is reverse with the stress developing tendency of the crack peak. The analysis shows that the above-mentioned factors should be synthetically considered to design the bridging slab. 1 tab, 14 figs, 6 refs.