Study on frost heave effect of prestressed tension retaining wall based on freeze-thaw cycle constitutive law
The stress state of frost heaving of prestressed tension retaining wall is complex,and the distribution of frost heaving force on the wall back is not clear.It is of great significance to further explore the distribution of frost heaving force of prestressed tension retaining wall.According to the actual monitoring temperature of a certain area in Harbin,the reasonable distribution of temperature field in the model space was simulated using ABAQUS numerical simulation software.Based on the plastic damage constitutive law of concrete after freeze-thaw cycles,the thermal and mechanical coupling analysis was carried out on the established temperature field.The influence of prestressed reinforcement and frost heaving time on the frost heaving effect of prestressed retaining wall was studied.The results show that the frost heaving force on the retaining wall presents an upper triangular distribution trend of"small at the top and large at the bottom".With the increase of frost heaving time,the frost heaving force will gradually increase at first,and then gradually decrease.The frost heaving force will be the largest 120 d after frost heaving.In contrast,due to the existence of pre-stressed steel bars,the frost heaving force of the pre-stressed split retaining wall will be increased due to the stress concentration,and the maximum frost heaving force can be increased by about 200 kPa.Under the action of prestressed reinforcement,the horizontal displacement of retaining wall will be reduced by 40%to 116%.The results of this study can provide technical support for the construction and design of prestressed split retaining wall in seasonally frozen soil areas.
万方数据
维普
