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地基回弹再压缩特性离心模型试验及数值模拟

, PP. 106-111

Keywords: 隧道工程,沉管隧道,回弹再压缩,离心模型试验,有限元模拟

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Abstract:

以港珠澳沉管隧道天然地基段某一横断面为研究对象,对垫层厚度1m及1.5m的工况分别进行了模拟整个施工过程的离心模型试验及有限元计算研究,揭示了不同垫层厚度地基回弹再压缩应力应变特性、沉管结构的应变特征,为沉管隧道的施工及地基处理方案设计提供依据。结果表明,开挖卸荷基底产生拱形回弹;回填后基底应力及沉管底板应变均呈马鞍形分布;随时间及回淤增加,仅基底中部应力增大。垫层薄,基底应力分布匀化效果差,再压缩量及工后沉降增大。

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