软土地基江堤加宽施工对既有大堤的影响

以某主干路改扩建工程为依托，采用数值模拟方法，探究不同水位条件下水泥土搅拌桩施工及路基填筑对既有大堤变形的影响。结果表明:大堤在扩建工程中存在不均匀沉降，在枯水期施工时，大堤呈现向背水侧变形的趋势；当水位升高至设计洪水位17.0 m时，堤身呈现向迎水侧产生微小变形的趋势，水位升高对大堤垂直方向上的变形影响程度较小，而对水平位移影响较大，但水平变形较小；水泥土搅拌桩法对软土地基的加固效果较为显著，且施工过程对大堤扰动较小，有效限制了大堤的水平位移，保证大堤在水位变化下地基处理与路基填筑施工过程中的稳定性。

Influence of the River Levee Widening Construction of Soft Soil Foundation on the Existing Levee

Based on the reconstruction and expansion project of a trunk road, the influence of cement soil mixing pile construction and embankment filling under different water level conditions on the deformation of the existing levees was analyzed by using numerical simulation method. The results show that there is uneven settlement in the dam widening construction, During the construction of the levee in dry season, the levee's deformation tends to deform towards the back water side. When the water level rises to the design flood level of 17.0 m, the levee tends to deform slightly towards the upstream side. The rise of water level has little impact on the deformation in the vertical direction of the levee, but has a greater impact on the horizontal displacement, and the deformation is still very small. The cement soil mixing pile has a significant effect on the reinforcement of soft soil foundation, and the construction process has little disturbance to the levee, it effectively limits the horizontal displacement of the levee. The stability of the levee in the process of foundation treatment and embankment filling under the change of water level is guaranteed.