基于PLAXIS的高水位路基沉降分析

运用PLAXIS对一实例工程设计进行了高水位路基沉降分析，并对路基坡脚点位移、超静水压、施工安全系数等进行了分析。针对该工程的实际情况，考虑到沉降引起的有效应力变化，做了更新网格分析。结果表明:①在具有高水位的软土层上修筑路基将导致孔隙水压增加，最大静水压位于路基中心之下；②各施工阶段皆处于安全状态；③使用更新网格和更新水压可以真实地分析土的沉降。

Analysis on Settlement of High Water Level Subgrade Based on PLAXIS

In this paper, the construction process of a high water level soft soil subgrade is simulated by PLAXIS, and the subgrade settlement, the toe displacement, the super hydrostatic pressure, the construction safety coefficient and so on are analyzed. In view of the actual situation of the project, considering the effective stress change caused by the settlement, the analysis of the updated grid is done. Simulation results show that:① construction of subgrade in the soft soil with high water level will lead to the increase of pore water pressure and the maximum hydrostatic pressure is located under the center of the subgrade;② each construction stage is in a safe state; ③ using the updated grid and the updated water pressure can truely analyze the settlement of the soil.