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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2.0 m以内,桩土应力比增加很快;随着填土高度的增加,在2～3.5 m范围内,桩土应力比迅速减少;填土高度大于3.5 m,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。
Through the in-situ test of pile-soil stress ratio of CFG pile composite foundation under the embankment of Dexing-Nanchang Expressway, in-situ test of CFG pile composite foundation with different pile spacing during embankment filling construction and under load test bearing plate Soil stress ratio test results were analyzed to explore the pile-soil stress ratio with load and time changes. The results show that there are differences between the stress ratio of pile and soil under the condition of embankment load and rigid load, and the results of the test of rigid-soil pile stress under construction in the embankment are smaller. The pile-soil stress ratio increased rapidly with the filling height within 2.0 m. With the increase of filling height, the pile-soil stress ratio decreased rapidly in the range of 2 ~ 3.5 m. The filling height was more than 3.5 m, the pile-soil stress ratio But also gradually increased, and the wavy changes; finally stabilized at between 1.18 ~ 2.26, and with the consolidation time is basically unchanged. The pile-soil stress ratio under the embankment load decreases with the increase of pile spacing, the pile spacing increases to a certain extent, and the pile-soil stress ratio changes slightly.