摘要
为了研究加筋防裂夹层在复合式路面结构防治反射裂缝的性能,采用ABAQUS软件建立了复合式路面结构的三维有限元模型,对加筋防裂夹层的不同布置位置、不同荷载作用以及不同加筋材料所产生的不同路面结构力学响应进行了分析。研究结果表明:钢丝网加筋防裂夹层布置于复合式路面沥青面层层底处,其防裂效果与成本比值最高;钢丝网防裂夹层通过自身的高抗拉强度与低延伸率来达到缓解接缝处的应力集中程度与竖向剪切位移,显著降低AC层剪应力、层底拉应力和PCC板顶弯沉差,荷载越大,减小幅度越明显;钢丝网相比土工格栅及土工布防治反射裂缝更加有效。建议加筋防裂夹层布置在AC层层底,在重载交通条件下使用钢丝网作为加筋防裂夹层,可以有效抑制反射裂缝出现。
In order to study the performance of reinforced crack prevention interlayer in composite pavement structure to prevent reflective cracks,a three-dimensional finite element model of composite pavement structure was established using ABAQUS software,and the mechanical responses of differentpavement structures caused by differentlocations of reinforced crack prevention interlayer,differentloads and differentreinforcement materials were analyzed.The results show that the ratio of crack prevention effect to cost is the highest when the steel wire mesh reinforced crack prevention interlayer is arranged at the bottom layer of asphalt surface of composite pavement.Through its high tensile strength and low elongation,the anti-crack sandwich of steel wire mesh alleviates the stress concentration and vertical shear displacement at the joint,and significantly reduces the shear stress of AC layer,the tensile stress at the bottom of the layer and the top bending settlement of PCC plate.The greater the load,the more obvious the reduction.Wire mesh is more effective than geogrid and geotextile in preventing reflection cracks.It is suggested that reinforced crack prevention interlayer should be arranged at the bottom of AC layer,and steel wire mesh should be used as reinforced crack prevention interlayer under heavy tra ffic conditions,which can effectively inhibit the occurrence of reflection cracks.
作者
吴梓敬
李汝凯
李先延
李杰
陈金彪
WU Zi-jing;LI Ru-kai;LI Xian-yan;LI Jie;CHEN Jin-biao(Yunnan Jiaotou Group Investment Co.,Ltd.,Kunming 650000,Yunnan,China;Chongqing Jiaotong University,Chongqing 400074,China;Yunnan Yunling Plateau Mountain Highway Engineering Testing Co.,Ltd.,Kunming 650000,Yunnan,China)
出处
《合成材料老化与应用》
2022年第6期72-75,共4页
Synthetic Materials Aging and Application
关键词
道路工程
复合式路面结构
反射裂缝
加筋防裂夹层
镀锌钢丝网
土工格栅
土工布
road engineering
composite pavement structure
reflective crack
reinforced anti-crack interlayer
galvanized steel wire mesh
geogrid
geotextile
作者简介
吴梓敬,本科,高级工程师,主要从事公路工程专业。
