Impact Analysis of Earth-filling Height on the Settlement Deformation of Rock-filled Ventilation Roadbed in Freeze-thaw Zone
In response to the frequent occurrence of uneven settlement diseases in the high-altitude freeze-thaw zone of the Xinjiang-Tibet Highway.A thermal-mechanical coupled finite element numerical model was established by taking into account boundary conditions such as temperature,solar radiation,wind speed,and"sunny-shady slope".The settlement deformation characteristics of the rock-filled ventilation roadbed were studied when the filling heights were set as 0.5 m,1.5 m,and 3.5 m,respectively.The results indicate that there are significant differences in the temperature field at different locations of roads in the freeze-thaw zone.The highest temperature on the sunny slope side throughout the year is much higher than other locations,and the temperature on the natural ground and the shaded slope side is lower.Increasing the height of the earth-filling on the upper side of the ventilation roadbed can improve the settlement problem in the early stage of the road.For example,the roadbed settlement difference of a 3.5 m earth-filling is only 1/3 times that of a 0.5 m earth-filling,and the corresponding lateral settlement difference is only 1.16 m.However,excessive earth-filling height can easily cause significant uneven settlement of the roadbed due to the"sunny-shady slope"impact.
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