碎石桩复合地基场地预制桩沉桩试验

Precast Pile Driving Test in Gravel Pile Composite Foundation

为了研究在沉管碎石桩复合地基场地中沉入预制桩的可能性,进行了预制桩沉桩试验。结果表明:该场地沉入预制桩是可能的;经低应变检测,试验桩全为完整桩;位于沉管碎石桩中心或桩间土部位的试验桩,其桩身垂直度偏差满足规范要求,但位于碎石和土交界部位的试验桩,桩身垂直度偏差超出规范要求。设计时应避开碎石和土交界部位布桩。试验结果可供同类工程参考。

Precast pile driving test is performed to investigate its possibility in gravel pile composite foundation with settling tube. The results show： it is possible to drive precast pile in this field. The piles are all intact piles by the low strain dynamic test. The vertical deviation of test piles meets the standard requirements except the one located on the junction of gravel and soil, so the piles should be arranged avoiding the junction of gravel and soil in the design. The test results could be used as references for similar projects.