Analysis on Mechanism and Influencing Factor of Asphalt Pavement Arch Expansion Disease in Desert Area
Due to the problem of asphalt pavement arch expansion disease in S21 Altay-Urumqi expressway in Altay desert area,the mechanism and influencing factors are analyzed.Through the field investigation and test,the causes of asphalt pavement arch expansion disease are analyzed.Based on Kirchhoff's thin plate theory and finite integral transformation method theory,the calculation formula of critical stress of base arch expansion is derived.The mechanical mechanism of asphalt pavement arch expansion disease is analyzed,and the critical stress value of base arch expansion is determined.The finite element model of the road is established,and the influence of the factors(e.g.base construction temperature,expansion coefficient,resilient modulus and maximum temperature of the pavement surface)on the maximum longitudinal stress of the base and the maximum arch height of the pavement surface are analyzed.Based on the critical stress value of base arch expansion,the corresponding recommendations are given.According to the study,the asphalt pavement arch expansion disease in S21 Altay-Urumqi expressway is the result of arch damage of the cement stabilized gravel base under excessive temperature stress.Considering the actual road conditions,When the maximum longitudinal stress is greater than the base arch expansion critical stress value,the base will occur arch instability damage.The base construction temperature,expansion coefficient,resilient modulus,and maximum temperature of the road surface are all sensitive factors for the maximum longitudinal stress of the base,while the resilient modulus of base has no significant effect on the maximum arch height of pavement.It is suggested that the base expansion coefficient is within 2.8×10-5 ℃-1,and the base resilient modulus is 1 400-2 200 MPa.
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