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中文摘要：
以扩建中的沪宁高速公路为实例，运用FLAC^3D程序对高速公路新老路基拼接中所产生的差异沉降问题进行了数值模拟分析，对拼接路基在荷载作用下的应力与变形特征以及差异沉降的发生过程进行了研究，讨论了路基的变形发展及应力的集中与分布情况。结果表明：新老路基的拼接部位是整个拓宽公路最薄弱的环节，水平应力和竖向应力都在拼接部位发生应力集中，最大沉降发生在新拓宽路基形心位置下方，采用台阶式拼接是一种控制新老路基差异沉降的有效方法。
英文摘要：
For the purpose of investigating the differential settlement problem occurred in jointing the new and old roadbed of freeway, the freeway from Nanjing to Shanghai, which was being extended, was chosen as an example and was simulated and analyzed by applying FLAC^3D. The characteristics of the stress and deformation, the developing process of differential settlement were studied after the load was added to the jointed embankments; deformation and development of roadbed, concentration and distribution of stress were discussed. It is indicated from the results that both the horizontal and vertical stresses concentrate in the jointed area which is the most unsubstantial position for the roadbed. The largest settlement occurs below the center of shape of the new extended roadbed. It is found that the method of step-jointing is effective for reducing and controlling the differential settlement of jointing of new and old roadbed.
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