IN-SITU TEST ON PILE-SOIL STRESS RATIO OF CFG PILE COMPOSITE FOUNDATION UNDER EMBANKMENT LOAD

摘要

The in-situ test of stress ratio of CFG pile composite foundation for the express way from Dexing to Nanchang in Jiangxi province is done, the test results of the pile-soil stress ratio of CFG pile composite foundation under different pile distance during embankment filling period and under loading test bearing board are analyzed, to investigate the principle of gained-pile-soil stress ratio changing with the time of the loading. The result indicates that the variation of pile-soil stress ratio under embankment load is quite different from that under rigid load. The pile-soil stress ratio under embankment load is less than that under the loading test. With the increasing load, there is a great increase at the beginning and decrease afterwards which is followed by flucations. Finally, it remains steady at the range of 1.18-2.26 and stays almost unchanged even the consolidation time changes. The pile-soil stress ratio is declining as the pile distance is becoming wider. The changes will decrease to a minimum as the pile distance is expanding to a certain degree.