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分析飞机多轮荷载作用下沥青道面表面弯沉、土基顶面竖向压应变、面层底面水平应力、基层或底基层底面水平应力对面层、基层或底基层厚度与模量、土基模量变化的敏感性。依托三维有限元平台对敏感性进行分析,选择B-777作为分析机型;以传统柔性类、沥青稳定类和半刚性道面作为分析结构。52种组合的分析结果表明:各力学响应量对土基都具有较高的敏感性,土基模量由30增至60 MPa的影响要大于60增至80 MPa;除传统柔性道面的面层底面水平应力外,底基层厚度对其他各响应量也具有较高的敏感性;层底的水平拉应力主要受上下层模量比影响,随着模量比的增加,上层底面开始出现拉应力,并逐渐增大,所以最大水平拉应力出现在传统柔性道面结构的面层底,沥青稳定基层的层底,以及半刚性基层的底基层底。
The deflection of asphalt pavement under multiple wheel loads, the vertical compressive strain at the top of soil foundation, the horizontal stress at the bottom of the surfacing layer, the horizontal stress at the bottom of the base or subsoil, the thickness and modulus of the surface layer, Sensitivity of modulus change. Based on the three-dimensional finite element platform, the sensitivity was analyzed, B-777 was selected as the analysis model, and the traditional flexible class, asphalt stabilized class and semi-rigid pavement as the analysis structure. The results of 52 kinds of combinations show that each mechanical response has a high sensitivity to the soil foundation. The influence of the soil modulus from 30 to 60 MPa is greater than 60 to 80 MPa. In addition to the traditional flexible pavement surface The thickness of the subbase layer is also highly sensitive to other responses. The horizontal tensile stress at the bottom of the layer is mainly affected by the modulus ratio of the upper and lower layers. As the modulus ratio increases, the bottom of the upper layer begins to pull Stress, and gradually increase, so the maximum level of tensile stress occurs in the traditional flexible pavement structure of the surface of the bottom of the base layer of asphalt stabilized base, as well as semi-rigid base of the base layer.