沥青加铺层温度应力研究(Ⅲ)：应力分析与局部处理

Thermal Stresses in Asphalt Overlay Paved on Existing Cement Concrete Pavements(Ⅲ):Thermal Stresses Analysis and Local Treatment Effects

研究旧水泥混凝土路面收缩与翘曲引起的沥青加铺层温度应力一般规律，分析旧水泥混凝土路面基层局部弱化或脱空、接缝两侧进行局部处理对沥青加铺层温度应力的影响．指出降低沥青加铺层温度应力最有效的工程措施是在旧水泥混凝土路面与沥青加铺层之间的接缝两侧设置具有较低剪切模量且材料泊松比较大的局部夹层，夹层段的层间水平刚度因子λu宜小于1／20，竖向刚度因子λv宜大于1／3，局部夹层单侧宽度以0．3～0．4m为宜．

The thermal stresses in asphalt overlay paved on existing cement concrete pavement slabs are systematically discussed, and the effects of void underneath cement concrete pavement slabs and local treatment near joint sides on thermal stresses are analyzed. It is concluded that the most efficient measure in practice to reduce the thermal stresses in asphalt overlay is to place an interlayer between asphalt overlay and existing cement concrete pavement slabs on joints area with low shearing modulus and Possion＇s ratio large enough （close to 0. 5）, in other words, the tangential stiffness factor λu shall be less than 1/20 and the normal stiffness factor λv shall be greater than 1/3, and the placing width of interlayer on one side of joint shall be 0. 3-0.4 m.