上拔荷载作用下等截面桩承载性状数值模拟

利用轴对称模型对等截面桩进行承受上拔荷载作用的有限元模拟.通过数值模拟研究桩的承载性状,包括桩的上拔位移、荷载传递特性和桩侧摩阻力的发展,并分析桩底部土体的局部应变以及土体位移场的分布.研究发现,在达到极限上拔荷载时,桩端周围土体出现剪应变方向相反的两个区域并形成剪切带,桩周土体的位移场逐渐呈倒锥形分布.

Numerical simulation for bearing performance of uniform-section pile under uplift loading

Numerical simulation of finite element for pile under uplift loading is done by axisymmetric model. The bearing performance of pile is studied, including uplifting displacement, load transfer, and development of side resistance. The strain of soil near the edge of pile and distribution of displacement field are studied. It is found that two areas occurs near the edge of pile in shear strain and its reverse direction and shear band comes into being when uplifting load is up to limit, and the shape distribution of displacement field becomes inverse cone gradually.