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高速公路拓宽路基差异沉降

, PP. 25-31

Keywords: 路基工程,拓宽路基,离心模型试验,沉降,加筋

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Abstract:

以安新高速改扩建拼接试验段为工程背景,采用土工离心模型试验,对新老路基拼接时以土工格室为主的多种土工合成材料加筋方案进行预测与对比,分析了拓宽高速公路老路基固结沉降和新老路基拼接后表面沉降的变化规律。试验结果表明对新老路基,填筑期的路基沉降在半年内总沉降中均占相当大的比例,在70%以上;加筋后路基的沉降小于不加筋路基,且各方案的路基顶面最大和最小沉降均分别发生在新路基路肩边缘和老路基中心;由于地质条件良好,总体沉降并不大,各加筋方案之间的沉降无明显差异,均保持在较小水平,最小和最大沉降分别为1.67cm与3.33cm,最大差异沉降为1.66cm。可见,加筋能均衡路基的不均匀沉降,并在一定程度上减小地基的总沉降。

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