潮汕车站桩网复合地基管桩承载性状数值分析

Numerical Analysis on Bearing Behavior of the Piles in Pile-net Composite Foundation for Chaoshan Railway Station

采用桩网复合地基,对软土地基进行加固处理是十分有效的措施。依托厦深铁路潮汕车站深厚软土的地基处理,利用FLAC3D有限元计算软件对潮汕车站桩网复合地基管桩承载性状进行数值模拟分析,以研究管桩桩身轴力特性及管桩桩身摩阻力分布特性。负摩阻力对桩网复合地基有不利的影响,其增大了桩的沉降量,降低了桩对上部荷载承载能力和桩网复合地基的整体工作性能。在工程设计过程中应充分考虑负摩阻力对桩承载力及沉降的影响。

It is a very effective measure that using the pile-net composite foundation to reinforce the soft foundation.In this paper,based on the foundation treatment of deep soft soil in the Chaoshan railway station area on Xiamen-Shenzhen Railway,the bearing behavior of pile of the pile-net composite foundation is analyzed by using the numerical simulation software FLAC3D to study the distributing properties of axis force and skin friction of pile body.The negative skin friction affect the pile-net composite foundation adversely because it can increase the settlement of pile and reduce upper bearing capacity of pile and whole working performance of pile-net composite foundation.During the engineering design process,the influence of negative friction on pile bearing capacity and settlement should be taken into full account.