桩基参数对岸坡稳定影响的数值模拟研究

Numerical simulation study on influence of pile foundation parameterson bank slope stability

针对桩基对岸坡稳定影响的问题,采用数值模拟方法分析有桩岸坡的桩间距、桩边长、桩长等参数的变化对岸坡稳定的影响。结果表明,对于同一岸坡和桩顶自由的条件,决定桩基对岸坡稳定作用效果的参数是桩边长(桩径)与桩间距的比值,即边距比(径距比),对特定的土层,存在一个边距比(径距比)值使桩基对岸坡稳定发挥最优作用;在桩尺寸和桩间距不变的情况下,单纯增加嵌固土层内的桩长,并不能提高桩基对岸坡稳定的作用效果。

Aiming at the influence of pile foundation on bank slope stability,we analyze the influence of pile spacing,pile edge length and pile length on bank slope stability by means of numerical simulation.The results show that the ratio of pile edge length(pile diameter)to pile spacing determines the effect of pile foundation on bank slope stability based on conditions of the same bank slope and the freedom of pile top.For a specific soil layer,there is a margin ratio(diameter-distance ratio)value,which makes the pile foundation play an optimal role in the stability of bank slope.With the same size and spacing of piles,simply increasing the length of piles in the embedded soil layer cannot improve the effect of pile foundation on bank slope stability.