在对半挖半填路堤病害及成因分析的基础上,分析了加筋路堤格栅工作机制。通过现场试验,对采用格栅加筋法处理的路堤挖填交界区域进行了原位观测,观测了路堤填土完成时路面沉降、竖向土压力及格栅变形情况。通过建立有限元分析模型,对路堤填筑完成时格栅的拉力及位移进行了分析,并对不同路面荷载和格栅刚度条件下,格栅的拉力与位移进行了计算。结果表明:路堤挖填交界处铺设格栅后,路面局部差异沉降较小。填方区域格栅底部土压力与填土自重应力相当,格栅存在有效加筋长度,在挖填交界面附近产生较大变形和拉力。上层格栅比下层格栅沉降曲线平缓,下层格栅的拉力在交界区域会陡然增大。路面荷载对格栅拉力和位移有一定影响,随埋深增加影响减小,格栅的竖向位移随着荷载增大略有增大,格栅在挖填交界面附近拉力增大。随格栅刚度增大,其拉力也增大,而位移变化很小。 Based on the analysis of the diseases and the causes of half-embankment embankment, the working mechanism of reinforced embankment grille is analyzed. Through on-the-spot test, the in-situ observation of embankment excavation and filling boundary zone treated by the grid reinforcement method was carried out. The settlement of the road surface, the vertical earth pressure and the deformation of the grid during the embankment filling were observed. Through the establishment of the finite element analysis model, the tensile force and displacement of the grille when the road embankment is completed are analyzed, and the tensile force and displacement of the grille under different road load and grid stiffness are calculated. The results show that the local differential settlement of the pavement is smaller after laying the grille at the junction of excavation and filling. The earth pressure at the bottom of the fill grille is equivalent to the self-weighting stress of the fill, and the grille has an effective length of reinforcement. Large deformations and tensions occur near the interface of the excavation and filling. The upper grille is more gentle than the lower grille, and the tensile force of the lower grille suddenly increases at the boundary area. The pavement load has some influence on the tensile force and displacement of the grid, with the increase of the buried depth, the vertical displacement of the grid increases slightly with the increase of the load, and the tensile force of the grid increases near the interface of the digging and filling. As the rigidity of the grid increases, the pulling force also increases, while the displacement changes little.