劳俊源

土拱效应是土工格栅加筋桩基路堤中普遍存在的现象。土拱的形成本质上是一个空间三维问题，在桩承式路堤内部会形成一系列的三维土拱。本文采用三维有限元模型研究了桩承式加筋路堤中土拱的群拱效应。通过将数值计算结果与全尺寸实验的实测数据进行对比发现吻合较好。通过控制不同位置桩间土的沉降，分析了土拱的变化规律。研究结果表明，随着下垫土层沉降量的增加，土拱现象更加明显，随着地基沉降的继续增加，土拱高度达到极限值，但这种沉降对附近的土拱影响不大。

土拱；群效应；土工格栅加筋桩基路堤；有限元模拟

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