界面糙化对刚柔复合式路面剪切强度的影响

Influence of Interface Roughening on Shear Strength of Rigid-flexible Composite Pavement

为解决刚柔复合式路面层间易出现滑移、剪切破坏的问题,以刚柔复合式路面层间构造为研究对象,研究采用嵌石构造层间界面对复合式路面层间剪切强度的影响。碎石粒径分别为2.36~4.75 mm、4.75~9.5 mm、9.5~13.2 mm,每种粒径下碎石的撒布面积设置为25%、50%及75%,嵌入深度为其粒径的2/5~3/5,利用自制的斜剪夹具,通过室内试验研究了三种碎石粒径下,各粒径对应三种碎石撒布面积时的复合试件层间剪切强度的大小。试验结果表明:(1)刚柔复合式路面层间剪切强度随着碎石粒径的增大而增大;(2)在三种撒布粒径对应的25%、50%、75%的撒布面积下,层间剪切强度随着撒布面积的增大而增大。

In order to solve the problem of slippage and shear failure between the rigid-flexible composite pavement layers,taking the rigid-flexible composite pavement interlayer structure as the research object,and studies the influence of the interlayer interface of the inlaid stone structure on the interlayer shear strength of the composite pavement.The particle sizes of the crushed stones are 2.36~4.75 mm,4.75~9.5 mm and 9.5~13.2 mm respectively,and the spreading area of the crushed stones under each particle size is set to 25%,50%and 75%,and the embedding depth is 2/5~3/5 of the particle size.Using a self-made oblique shear fixture,the interlaminar shear strength of the composite specimen was studied under three types of crushed stone particle sizes,and each particle size corresponds to the three types of crushed stone distribution areas.The test results show that:(1)The interlayer shear strength of rigid-flexible composite pavement increases with the increase of the gravel particle size;(2)Under the spreading area,the interlayer shear strength increases with the increase of the spreading area.