基于落锤式弯沉仪的旧沥青混凝土路面结构强度评定

Structural Strength Evaluation of Old Asphalt Concrete Pavement Based on Falling Weight Deflectometer

文章以樟树至吉安高速公路路面为研究对象,采用落锤式弯沉仪对道路全横断面进行弯沉值检测,在此基础上计算路面结构强度指数,评定路面结构强度等级。结合弯沉盆检测结果,反算沥青层、基层和土基的动态模量,评估路面结构性能。研究表明,该高速公路沥青路面承载能力良好,结构强度指数PSSI均大于80;部分路段弯沉值较大,超过设计弯沉值;各结构层状态分布不一,动态模量离析严重。

Taking Zhangshu-Ji’an Highway pavement as the research object,the deflection value of the whole cross section of the road is detected by falling weight deflectometer in this paper.On this basis,the pavement structure strength index is calculated and the pavement structure strength grade is evaluated.Combined with the deflection basin test results,the dynamic modulus of the asphalt layer,base layer and soil foundation is calculated inversely to evaluate the pavement structure performance.The research shows that the asphalt pavement of the highway has good bearing capacity,and the structural strength index PSSI is greater than 80.The deflection value of some road sections is larger than the design deflection value.The state distribution of each structural layer is different,and the dynamic modulus segregation is serious.