堆载范围与桩径对桩侧摩阻力影响的研究

Research on the influence of the heap load range and the pile diameter on the skin friction behavior of piles

针对地面堆载范围与桩径对桩侧摩阻力特性的影响,采用有限元软件进行数值模拟,研究结果表明:影响桩侧摩阻力特性的堆载范围存在一个界限值,当堆载范围小于此值时,桩身轴力和摩阻力随着堆载范围的增大而增大,但是增大幅度逐渐减小;当地面堆载范围大于此界限值时,桩身轴力与桩身侧摩阻力值趋于稳定,在界限值堆载范围下,桩身轴力随着桩径增大而增大,桩身摩阻力值和桩径大小成负相关关系,但不同桩径的中性点位置相同。

The influences of heap load range on a ground and the diameter of pile on skin friction characteristics are simulated by finite element software. It is pointed out that a critical value exists for the heap load range which affects skin friction characteristics of pile, when the heap load range is less than the value, pile axial force and friction resistance increases as the heap load range, but increases deputy degree decreases, the pile axial force and side frictional resistance value tends to be stable when heap load range on a ground is greater than the value. Under the criti- cal heap load range, the axial force increases with the pile diameter while there is a negative correlation relationship between the change value of the pile friction resistance and the pile diameter, but neutral position of each pile is the same.