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土工合成材料是防治半刚性基层沥青路面反射裂缝的有效措施。借助三维有限元软件,对荷载模型、几何模型等参数进行分析,确定了含有土工材料且半刚性基层具有贯穿裂缝的沥青路面结构三维有限元模型。在此模型基础上,分析了土工材料弹性模量、厚度、铺设宽度、裂缝两侧的刚度差异等参数对沥青加铺层层底剪应力、层底拉应力、路表弯沉的影响。结果表明:土工材料参数对路表弯沉影响不明显;土工材料弹性模量和厚度对沥青面层底部的剪应力影响不大;随着土工材料铺设宽度的增大,沥青面层底部的剪应力和拉应力不断下降,通过分析确定合理的铺设宽度应为4m。当裂缝两侧的基层出现刚度差异时,通过设置土工材料,可降低沥青面层内的剪应力。
Geosynthetics is an effective measure to prevent reflective cracks in semi-rigid base asphalt pavement. The three-dimensional finite element software is used to analyze the load model, geometric model and other parameters to determine the three-dimensional finite element model of asphalt pavement structure with geotextile material and through-crack in the semi-rigid base. Based on the model, the influence of the elastic modulus, thickness, laying width and stiffness difference of both sides of the geosynthetics on the bottom shear stress, the tensile stress at the bottom and the deflection of the road surface are analyzed. The results show that the influence of geotechnical parameters on the deflection of road surface is insignificant. The elastic modulus and thickness of geosynthetics have little effect on the shear stress on the bottom of asphalt pavement. With the increase of the laying width of geosynthetics, Stress and tensile stress continue to decline, through the analysis to determine a reasonable laying width should be 4m. When the base of the crack on both sides of the stiffness difference occurs, by setting the geotextile material, can reduce the asphalt surface shear stress.