钻孔灌注桩悬臂挡墙与泡沫轻质土拓宽路基技术

依托某高速铁路车站路基拓宽项目，研究悬臂式挡墙与泡沫轻质土填料拓宽路基结构变形特征和受力机理，对比新型路基拓宽结构与传统路基拓宽结构的优缺点。运用FLAC3D有限差分软件进行模拟，验证了模型的准确性。研究结果表明:悬臂式挡墙与泡沫轻质土结构拓宽路基后，既有路基与拓宽路基顶面沉降均较小，挡墙墙顶处水平位移最大，墙体发生绕墙底转动；路基结构具有更好的稳定性与承载性能，可广泛推广应用于路基拓宽工程中。

Technology of Widened Subgrade for Cantilever Retaining Wall and Foamed Lightweight Soil of Cast-in-situ Bored Pile

Based on the subgrade widening project of a high-speed railway station, the deformation characteristics and force mechanism of the cantilever retaining wall and foamed lightweight soil filling widened subgrade have been studied, and the advantages and disadvantages between new subgrade widening structure and the traditional subgrade widening structure have been compared. The software FLAC3D is used to simulate and verify the accuracy of the mode. The results of the research show that after the cantilever retaining wall and foamed lightweight soil structure are used to widen the subgrade, the top settlement of the existing and widening subgrade is lesser, the top of the retaining wall has the largest horizontal displacement, and the wall rotates around the bottom. the widened subgrade structure has better stability and bearing capacity, which can be generalized and applied to subgrade widening projects.