中文摘要：

针对类风积沙路基拓宽工程中的关键技术问题,结合绥沈高速公路类风积沙路基加宽工程,采用有限元软件PLAXIS分析了强夯冲击荷载作用下地基的动力响应、不同地基处理方式下新老路基的变形及边坡稳定性的影响。计算结果表明,强夯容易使仍处于正常运营中的高速公路坡脚产生破坏,在极端降雨条件下削坡坡脚和土工格栅交接处会出现较大应变,对于路基填料为类风积沙的高速公路加宽部分地基宜选用坡脚挡土墙＋墙下预制管桩复合地基的方式来加固处理,且管桩能有效的控制剪应力传递给新加宽的路基。

英文摘要：

Focusing on the key technology problem of aeolian sand subgrade widening problem,based on the real case of Suishen highway widening problem.Finite element software PLAXIS was adopted to analyze the shock load of dynamic consolidation,dynamic response of the foundation from different ground treatment methods.The results indicate that intensive tamp will cause damage in the slope toe easily.Under the extreme precipitation condition,cut slope foot and geogrid junction appear a larger strain,slope retaining wall prefabricated pipe pile composite foundation is suitable in this case,and the pipe pile can effectively control the shear stress of the new widening subgrade.