载体桩单桩竖向承载力学性能研究进展

A review of research on vertical bearing capacity of single pile with ram-compacted bearing sphere

载体桩作为一种由混凝土桩身和载体构成的新型桩基础,具有承载力高、造价低等优点,合理确定载体等效尺寸对于载体桩单桩竖向承载力计算具有重要意义。在总结载体桩施工工艺演进及承载机理的基础之上,介绍了载体桩单桩竖向受压承载性能、抗拔承载性能及沉降计算方法的研究现状,分析了目前载体等效计算面积取值、抗拔承载力计算时载体影响区段几何参数确定以及载体桩沉降计算中存在的问题,提出了多角度综合确定载体等效尺寸、强化桩身与载体界面连接、开展动荷载作用下载体桩承载性能测试等方面的研究建议。

The novel pile with ram-compacted bearing sphere,composed of a concrete pile body and a bearing sphere,is characterized by high bearing capacity and low cost.It is important to confirm the equivalent size of the bearing sphere reasonably for the calculation of the vertical bearing capacity of a single novel pile.Based on the summary of the construction techniques and load-carrying mechanism,the research status of the vertical bearing performance,uplift bearing performance and settlement calculation methods for the single pile with ram-compacted bearing sphere was introduced,the problems of setting an appropriate value for the bearing sphere equivalent area,the determination of geometric parameters of the influenced section when calculating the uplift bearing capacity and settlement were analyzed.And then research suggestions were put forward as follows:comprehensively determining the bearing sphere equivalent size from multiple perspectives,strengthening the connection between the pile shaft and bearing sphere and carrying out the bearing capacity performance tests under dynamic load.