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为把握新路基荷载作用下隔离墙加固直接方式拼接的拓宽路堤工作性状,建立了二维弹塑性有限元模型。通过有限元数值模拟分析,从加固前后拓宽路堤的沉降、地基土水平位移和竖向附加应力的变化等方面揭示了隔离墙的加固机理,并分析了隔离墙的最佳设置位置。计算结果表明,隔离墙的设置可有效地减小地基土水平位移和竖向附加应力,从而减小新老路基的沉降和差异沉降。拓宽路堤最大沉降和横向坡率的变化大小与隔离墙位置有关,隔离墙的最佳位置在新路肩下。
In order to grasp the working characteristics of broadened embankment strengthened by the direct reinforcement method of the wall under the load of new subgrade, a two-dimensional elasto-plastic finite element model was established. Through finite element numerical simulation analysis, the reinforcement mechanism of the wall is revealed from the aspects of widening the embankment settlement, the horizontal displacement of foundation soil and the vertical additional stress before and after reinforcement, and the optimal setting position of the wall is analyzed. The calculation results show that the setting of the separation wall can effectively reduce the horizontal displacement and vertical additional stress of the foundation soil, so as to reduce the settlement and differential settlement of new and old subgrade. Broaden the maximum embankment settlement and lateral slope changes in size and the size of the wall, the best position of the wall under the new shoulder.