Traditionally, potholes are mainly paved for maintenance, and the asphalt mixture needs to be compacted. But due to the construction quality problem, the compacting degree of asphalt mixture may not be enough and the void ratio of asphalt mixture may not meet the requirements, resulting in the premature damage of the potholes after repair. If the repair material can be prefabricated, this problem will be well solved. So, based on the structure form of the prefabricated rapid maintenance of asphalt pavement, this paper aims to determine the most unfavorable loading position in pothole repair, which was established by the ANSYS software with the finite element model. The results show that the most unfavorable loading position of tensile stress for patch materials and joint filling material is C1-1 (A2-2) and the most unfavorable loading position of shear stress for joint filling material and leveling layer is B2-1 and C1-5. Subsequently, the influences of the material modulus, size, thickness, and modulus of the old pavement material on the potholes are calculated by using the finite element model under the most unfavorable loading position.
Urban rail transit has become an important basic public transport facility, is of great significance to urban development and economic construction. During the operation of subway locomotive, stray current will flow into the earth, resulting in the change of soil potential. Thus, it will lead to the neutral point grounded transformer DC bias and buried metal corrosion. Firstly, based on COMSOL finite element simulation software, a composite layered soil model was constructed to simulate the real soil environment. Secondly, according to the rail current distribution of two-terminal power supply, the stray current distribution model was constructed with locomotive position changing. Finally, the potential changes of grounded transformer and buried metal during subway operation was simulated. The research showed that the soil potential distribution change rate is related to the subway locomotive location. When the locomotive position is determined, the induced potential changes more rapidly in the higher soil resistivity, and there is a step change of potential at the soil layer boundary.
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