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路堤荷载下CFG桩复合地基桩土应力比原位测试

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Keywords: 道路工程,高速公路,桩土应力比,原位测试,CFG桩复合地基,柔性荷载

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Abstract:

通过对德兴至南昌高速公路填土路堤下CFG桩复合地基桩土应力比的现场原位测试试验,对不同桩距的CFG桩复合地基在路堤填筑施工期和载荷试验承载板下的桩土应力比测试结果进行分析,探讨了桩土应力比随荷载和时间变化的规律。结果表明路堤荷载条件下与刚性荷载下桩土应力比的变化规律存在着差异,在路堤施工期测试的桩土应力比较刚性荷载试验测试的结果要小。填土高度在2.0m以内,桩土应力比增加很快;随着填土高度的增加,在2~3.5m范围内,桩土应力比迅速减少;填土高度大于3.5m,桩土应力比又逐渐增加,且呈波浪形变化;最后稳定在1.18~2.26之间,且随固结时间基本不变。路堤荷载下的桩土应力比随桩距的增加而减少,桩距增大到一定程度,桩土应力比变化微小。

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