挤扩支盘桩受力机理试验研究

Experimental study on loading mechanism of compaction-under reamed bored pile

通过 36根室内模型桩和 2根足尺挤扩桩的试验研究 ,分析探讨挤扩桩的受力机理及承载力性状 ;同时收集调研了 2 1根工程挤扩桩试验资料。室内外试验中 ,通过埋设在支或盘部位的土压力盒和沿桩身布置应变计 ,分别测试支或盘分担荷载的传递规律。此外 ,对挤扩支盘桩的承载力标准值及变形公式提出建议 。

Based on the 36 laboratory test piles and 2 full scale test piles, the failure mechanism and bearing capacity behavior of compaction under reamed bored pile has been studied and analyzed. At the same time, 21 working static load test piles have been collected and analyzed. The load transfer law along the pile body is analyzed with pressure cell and strain gauge. Moreover, the experimental formula of the bearing capacity and deformation of the new pile are presented. The ratio of side friction and end capacity of disk have been calculated. Compression with a lot of experiment data indicates that the experimental formula give a close agreement with the laboratory test and full scale test.