考虑温度影响的半刚性基层沥青路面裂缝处结构强度变化规律分析

Analysis on Structural Strength Change Law at Cracks of Semi-rigid Base Asphalt Pavement Considering Temperature Influence

摘要:

裂缝病害是当前高速公路沥青路面出现的主要病害类型之一，裂缝对路面的结构强度产生一定程度的削弱。根据弯沉盆数据可以反演各结构层模量，评估结构强度。选取宁杭高速开展针对裂缝的弯沉检测，对裂缝处结构强度变化规律和受温度影响情况进行分析。结果表明：裂缝对弯沉影响显著，裂缝处弯沉约是完好处弯沉的2.17倍，裂缝处基层和底基层模量衰减程度较为严重，基层衰减程度为81.49%，底基层衰减程度为77.45%；完好处的面层材料模量相较于裂缝处受温度影响较大，变化幅度可达到10.3倍，基层、底基层和路基的模量随温度变化并不明显。

Abstract:

Crack disease is one of the main types of diseases in the current expressway asphalt pavement. Cracks weaken the structural strength of the pavement to a certain extent. According to the deflection basin data, the modulus of each structural layer can be inverted to evaluate the structural strength. Ninghang Expressway is selected to carry out the deflection detection for cracks, and the variation law of structural strength at cracks and the influence of temperature are analyzed. The analysis results show that the crack has a significant effect on the deflection. The deflection at the crack is about 2.17 times that of the intact deflection. The modulus attenuation of the base and subbase at the crack is more serious. The attenuation degree of the base is 81.49 %, and the attenuation degree of the subbase is 77.45 %. The modulus of the intact surface material is greatly affected by temperature compared with the crack, and the change range can reach 10.3 times. The modulus of the base, subbase and roadbed are not obvious with the temperature change.