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高速公路拓宽路基软土工程特性试验

, PP. 37-42

Keywords: 道路工程,高速公路,拓宽,软土路基

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Abstract:

分析了新老路基各试验断面软土层的物理力学特性,开展了新老路基软土室内三轴剪切试验和直剪试验,并进行了试验对比分析。结果表明老路基经过多年的运营产生了固结变形,其固结程度与力学性质好于新路基,表现在老路基软土的抗剪强度稍高于新路基对应位置,粘聚力高于新路基,但内摩擦角则相对低于新路基;由直剪试验求得的软土粘聚力普遍小于由三轴剪切试验求得的软土粘聚力,内摩擦角则相对较大;建议在考虑新路基的软基段的处理方法时,采取比相应段原有老路基的处理方式更为刚性的处治对策,更加严格地控制新路基沉降和差异沉降。

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