旧水泥混凝土路面破裂板沥青加铺层设计方法研究

Study of design method for asphalt overlay on cracking slab of cement concrete pavement

为了方便快捷地确定计算路面结构厚度所需的重要参数,根据弹性半空间理论,研究了承载板下旧水泥混凝土路面破裂板的竖向弯沉与弹性模量、泊松比、平均触地压力及承载板直径之间的关系,依据试验路现场测试结果,得出了弯沉和破裂板顶面当量回弹模量之间的回归公式,在此基础上,对旧水泥混凝土路面破裂板上沥青加铺层结构的设计方法进行了研究,根据当量回弹模量、道路等级、面层、补强层类型及累计轴载作用次数计算设计弯沉值,由设计弯沉值即可推算出沥青加铺层所需的厚度.

In order to determine the important parameter of calculating pavement thickness conveniently and rapidly, on the basis of the elastic-half-space theory, the relations among deflections, elastic modulus , Poisson ratio, average touch pressure and bearing board diameter are studied,according to the spot testing results on testing section, the regression equation of deflections and equivalent resilient modulus on top of cracking slab is obtained, and the design method for asphalt overlay structures on cracking and seating slab are studied, the design deflection is calculated by equivalent resilient modulus, highway grade, styles of pavement and reinforce layer,and cumulative equivalent axle loads,therefore,the thickness of asphalt overlay can be calculated by design deflection.