论文部分内容阅读
软土地基上高速公路拓宽时,新老路基结合部会出现差异沉降、路面裂缝等病害。基于D-P模型,采用有限元法分析新路堤作为附拓荷载对老路堤与地基变形的影响,并通过有限元数值模拟计算结果与现场监测数据资料对比。分析表明,拓宽路堤的填筑将会引起老路不同位置的过大附加差异沉降,老路堤靠近中心线出现略微的向上和向内的移动;老路肩有向外的较大的水平位移指向道路的外侧;新路堤靠近坡脚处出现较大的水平位移指向道路的内侧,最大沉降的位置在拓宽后路基表面的中心处,并逐渐向外移动,呈现出一定的规律性。
When the expressway on soft ground is widened, there will be differential settlement and pavement cracks at the junction of old and new subgrade. Based on the D-P model, the influence of the new embankment as the extension load on the deformation of the old embankment and foundation was analyzed by finite element method. The calculated results were compared with the field monitoring data by finite element method. The analysis shows that widening the embankment will result in excessive additional settlement of the old road at different locations. The old embankment moves slightly upward and inward near the center line. The larger horizontal displacement of the old road shoulder points to the road Outside the new embankment, a large horizontal displacement near the foot of the embankment points to the inside of the road. The location of maximum settlement is gradually broadened to the center of the surface of the subgrade and moves outward gradually, showing a certain regularity.