武汉鹦鹉洲长江大桥1#墩群桩承载特性分析

Research On Bearing Characteristics of Piles Group Foundation Under 1# Pier of Wuhan Parrot Cay Yangtze River Bridge

根据武汉鹦鹉洲长江大桥1#墩44根超长哑铃型群桩基础工程,利用弹塑性有限元,对群桩沉降、桩身应力分布进行了数值计算,并分析了土体弹性模量、粘聚力以及内摩擦角等参数对群桩承载特性的影响.研究结果表明:该群桩基础的沉降量中间较两侧大,竖向应力沿桩身由上向下递减;桩基承载力随土体弹性模量、粘聚力和内摩擦角的增加而变大.

According to the dumbbell piles group foundation under 1 # pier of Wuhan Parrot Cay Yangtze River Bridge, the finite element method was used to calculate settlement of the piles group and pile stress distribution. The effect of soil elastic modulus, cohesion, angle of internal friction on pile group settlement and bearing characteristic were also analyzed. The results show that settlements of the middle piles is lager than those of the side piles; the vertical stress along ,piles are decreasing from top to bottom, the bearing capacity of pile group becomes larger with the increase of soil elastic modulus, cohesion and angle of internal friction.