多层连接双排桩基坑支护FLAC-3D数值模拟及分析

FLAC3D Numerical Simulation and Analysis of Multiple Layers Horizontal Connection of a Double-row Piles Retaining Structure

为了研究多层连接双排桩支护结构桩间距对支护性能的影响,运用FLAC3D建立了深基坑多层水平连接双排桩支护的计算模型,进行分层开挖三维动态模拟计算,同时讨论了排距、桩长等参数对桩顶位移的影响。通过多工况数值分析求得：当桩长约为开挖深度的1.8~2.0倍时,排距与基坑开挖深度之比为0.43~0.50,基坑支护效果较好。为探究多层水平连接双排桩支护结构提供有益指导。

In order to investigate the effect of the multiple layers horizontal connection of a double - row piles retaining structure pile spacing on supporting performance. The FLAC3D is used to applying a numerical model of multiple layers connection of double - row piles supporting structure , conducting a three - dimensional dynamic simulation on excavation. The influences of row spacing , pile length on displacement of pile top were discussed. Tile result show that a good supporting effect can be achieved when the ratio of pile length and foundation depth is 1.8 - 2. 0, and the ratio of row spacing and foundation depth is 0.43 - 0.50. This paper gives the theoretical guide to study the new multiple layers horizontal connection of double - row piles supporting structure.