GFRP桩在泥炭质土中静压挤土效应试验

Experiments of soil compacting effects of GFRP pile in peaty soil

在泥炭质土中沉入3根直径分别为38、75和92 mm的玻璃纤维增强复合材料（glass fiber reinforce polymer,GFRP）模型桩,监测在沉桩过程中沿径向的地面隆起量、不同深度处径向挤土压力和桩身侧摩阻特性,得到沉桩时地面隆起量的分布规律,及与桩轴不同距离处沿深度方向的挤土压力变化规律.当沉桩深度达到0.15倍桩长时,出现最大地表隆起量,且最大地表隆起量出现在距桩轴1.50~2.50倍桩径处.沉桩结束后,径向挤土压力沿着深度方向逐渐增大.

Three glass fiber reinforce polymer piles with diameters 38,75 and 95 mm respectively were penetrated into peaty soil. The law of land upheaval with radial distance,the law of soil compacting pressure with depth and radial distance during pile-sinking,and the friction change along piles were monitored. The law of land upheaval with radial during pile-sinking,and the law of soil compacting pressure with depth and radial distance were analyzed. The experimental results show that the maximum land upheaval occurs at 1. 50 ~ 2. 50 times the pile diameter from the axis of pile when pile is penetrated into soil at a depth of 0. 15 times the pile length. At the end of pile-sinking,radial soil compacting pressure increases along depth direction.