土工布在水泥混凝土路面加铺沥青混凝土层结构中的抗剪试验分析

Analysis of Shear-Bearing Test for Geotextile Between Cement Concrete and Asphalt Concrete Overlay

在水泥混凝土路面加铺沥青混凝土面层(简称"白加黑")的路面结构中,利用层间铺设土工布来延缓、减少反射裂缝是一种经常被采用的技术方案。但铺设土工布后,层间黏结力下降,容易造成沥青混凝土加铺层推移而致过早破坏。针对此现象,运用有关力学软件计算分析了水泥混凝土面板与沥青混凝土加铺层结构中的层间剪应力,发现层间光滑时的剪应力大于层间黏结时的剪应力;同时,通过试验路与室内试验,分析了铺有土工布的水泥混凝土面板与沥青混凝土层之间的抗剪能力,发现土工布满足层间抗剪要求,但抗剪富余系数不大,因此铺有土工布的水泥混凝土路面加铺沥青混凝土层的路面结构容易发生推移破坏。

To prevent reflective cracking,the geotextile is often layed between cement concrete pavement and asphalt concrete overlay.But cohesion between two layers is reduced after construction of geotextile,so it creates moving of asphalt concrete overlay.The shear stress between old cement concrete pavement and asphalt concrete overlay is analyzed through finite element model.It is found that shear stress is bigger on the assumption of perfectly smooth compared to the assumption of perfectly junction. Through experiment road and indoor test,shear-bearing capacity between cement concrete pavement and asphalt concrete overlay is analyzed while the geotextile is layed.It is found that the geotextile can satisfy the request for single shear-bearing,but redundancy coefficient is low,so moving of asphalt overlay is created easily when the geotextile is layed between old cement concrete pavement and asphalt concrete overlay.