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利用离心模型研究了软土地基上高速公路加宽中筋材拉应变和新老路堤变形特性。离心模型试验结果表明,土工格网铺设在软基和路堤之间比铺设在加宽路堤中部加筋效果显著,同时加筋可以降低加宽路堤的差异沉降。为较为全面分析加宽工程加筋路堤性状,采用大型有限元软件ABAQUS对离心模型试验进行了数值模拟。数值模拟和离心模型试验结果具有良好的一致性。同时,采用有限元方法对加筋效果进行了进一步的分析,结果表明,加筋可以限制加宽路堤横向变形;建议新路堤加两层筋,一层在底部,一层在中部,以限制路堤的位移,提高整体稳定性,并应嵌入老路一定长度。
Centrifugal model was used to study the tensile strain of widened tendons and the deformation characteristics of old and new embankments on expressway with soft soil foundation. Centrifugal model test results show that geogrid laying between the soft foundation and the embankment is more effective than laying the embankment in the middle of the widened embankment, and the reinforcement can reduce the differential settlement of widened embankments. In order to comprehensively analyze and broaden the embankment characters of engineering embankment, a large-scale finite element software ABAQUS was used to simulate the centrifugal model test. Numerical simulation and centrifugal model test results have good consistency. At the same time, the finite element method is used to further analyze the reinforcement effect. The results show that the reinforcement can limit the lateral deformation of widened embankment; it is suggested that the new embankment should be reinforced with two layers of tendons, one at the bottom and the other at the middle to limit the embankment The displacement, improve the overall stability, and should be embedded in a certain length of the old road.