水平荷载对支盘桩受压承载力的影响分析

Analysis on Influence of Horizontal Load on Bearing Capacity of Branch Pile

摘要:

针对单独竖向受压荷载作用和受压 + 水平组合荷载作用两种情况，采用数值分析，对支盘桩的沉降特征、桩 身轴力分布、支盘阻力、竖向承载力等承载性能进行系统地分析，进一步确定了支盘桩受压承载力的大小。研究表明: 桩身轴力随深度增加而减小，在支盘上下处明显降低; 在支盘荷载量级较小时，相比于单独受压荷载作用下，受压 + 水平组合荷载作用下的桩顶沉降较大。水平荷载的存在会对支盘桩的受压承载力产生一定程度的影响，会使受压承 载力略有增加，但总体上影响不太大。

关键词:支盘桩; 竖向受压承载力; 水平荷载; 数值模拟

Abstract:

For the two cases，that is，individual vertical compressive load and combined horizontal compressive load，the numerical analysis method is adopted to systematicly study the bearing behaviors of branch pile，including settlement，distribution of shaft axial force and branches＇friction etc． The magnitude of vertical bearing capacity of branch pile is further obtained． The research shows that the axial force of pile decreases with the increase of depth，and decreases obviously at the upper and lower sides of the branches． Compared with individual compressive load，when the load is less，the settlement is greater at the top of the pile which is borne combined load． The existence of horizontal load has an effect on bearing capacity of branch pile， which makes bearing capacity of branch pile increase slightly，but not too large．

Key words:branch pile; vertical bearing capacity; horizontal loading; numerical analysis