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基于弹塑性有限元方法,对老路基抬高加宽这一新的拓宽方式下公路拓宽工程的变形特性进行了数值模拟分析。分析结果表明,与老路基不抬高直接加宽路基相比,老路基抬高加宽路基的路表沉降、路表水平位移和地基土侧向位移都要大得多。老路基顶面以上的路表沉降分布更为均匀;新路肩和老路中心处地基土固结速率间的差异较小。随着老路基抬高高度的增加,路表工后沉降从老路中心处最小变为新路肩处最小,工后出现负坡率。
Based on the elasto-plastic finite element method, the deformation characteristics of highway widening project under the new widening mode of old embankment widening are numerically simulated. The analysis results show that the old roadbed is widened to widen the road surface settlement, the horizontal displacement of the road surface and the lateral displacement of the foundation soil are much greater than the old roadbed without raising the embankment directly. The subsidence distribution of the road surface above the top of the old subgrade is more uniform; the difference between the consolidation rates of the subgrade and soil at the center of the new shoulder and the old road is small. With the increase of the height of the old embankment, the settlement of the road surface post-construction changes from the minimum at the center of the old road to the minimum at the new shoulder and the negative slope after work.