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路基挡土墙是城市道路中的常见结构物,具有节约空间、减少路基填方等优点。在路基填筑过程中,填土荷载和碾压荷载都会对挡土墙产生挤压作用,导致挡土墙承受侧向应力并产生位移。该文结合盐城市范公路某标段路基填筑施工,在现场埋设土压力盒和测斜管进行试验研究,得到了土压力和位移的发展规律。路基中垂直土压力主要由土体的重力引起,基本随土体深度呈线性分布。在碾压过程中对墙背水平土压力影响很大,填土不高时水平土压力接近于被动土压力,但随着填土高度增加其增长速度放缓,在填土1.0~1.4m高度达到最大值后出现明显下降,最后趋近于静止土压力。挡土墙位移基本是绕墙底的转动位移,施工前期位移增长缓慢,到后期填土接近墙顶时位移发展很快。最后利用有限元软件很好地模拟了路基中土压力的分布和挡墙位移。
Subgrade retaining wall is a common structure in urban roads, with the advantages of saving space and reducing roadbed filling. During the process of embankment filling, both the soil filling load and the rolling load will exert a squeezing action on the retaining wall, resulting in the retaining wall being subjected to lateral stress and displacement. Combined with the construction of subgrade filling of a certain section of Fancheng Highway in Yancheng, the earth pressure box and inclinometer pipe are buried in the site for experimental research, and the development rules of earth pressure and displacement are obtained. The vertical earth pressure in the subgrade is mainly caused by the gravity of the soil, which is basically linear with the soil depth. During the compaction process, the horizontal earth pressure on the back wall is greatly influenced. When the fill is not high, the horizontal earth pressure is close to the passive earth pressure. However, with the increase of fill height, the growth rate slows down. At the height of 1.0 ~ 1.4m After reaching the maximum value decreased significantly, and finally approached the static earth pressure. Retaining wall displacement is basically the rotation displacement around the wall, and the displacement of the early stage of construction is increasing slowly. When the filling is close to the wall top, the displacement will develop rapidly. Finally, the distribution of soil pressure and the displacement of retaining wall in subgrade are simulated well by finite element software.