扩底桩上拔土体破坏形态分析

摘要

The whole shear failure form of the short piles with the enlarged bottom was obtained through the analysis of the static load tests.Through the finite element analysis of uplift piles with the enlarged bottom, it was concluded that the ultimate bearing capacity of the pile was directly proportional to the length of pile L.With the increase of pile length L, there existed a certain regularly change of failure form, which included the global slip-shear failure, the contracting inword shear failure, and the stably local shear failure.%对扩底抗拔短桩做静载荷试验分析,得到其具有整体剪切破坏的形式.同时,对扩底抗拔桩做了有限元法分析,结果表明,桩的极限承载力与桩长L成正比,并且随着桩长L增加,存在着一定变化规律的破坏形式,即整体剪切-内缩式局部剪切-稳定态局部剪切.