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支承在中等密实圆砾层上的桩基础,受长期振动时相继出现持续沉陷事故,引起了工程界的重视。本文探讨了长期振动下桩的承载力问题,介绍了桩的现场振动荷载试验方法,阐述了长期振动下桩的沉陷特性。对振动引起的地基塑性变形提前出现的原因进行了初步分析。最后,笔者以试验为基础,提出桩的持久承载力概念和按振动大小确定单桩承载力的方法。
The pile foundation supported on the medium dense compacted gravel layer suffered continuous subsidence accidents when it was subjected to long-term vibration, which attracted the attention of the engineering community. In this paper, the problem of bearing capacity of piles under long-term vibration is discussed. The in-situ vibration load test method of piles is introduced, and the settlement characteristics of piles under long-term vibration are described. The cause of the early occurrence of plastic deformation of foundation caused by vibration was analyzed. Finally, based on the experiment, the author put forward the concept of the pile’s long-term bearing capacity and the method of determining the bearing capacity of the single pile according to the vibration size.