静压楔形桩沉桩效应模型试验研究

为探讨楔形桩与等截面桩在静力沉桩过程中的沉桩效应,在软土地基中分别对l根等截面模型桩和3根不同楔角的楔形模型桩进行静力沉桩试验.通过试验数据整理分析,获得等截面桩与楔形桩在静力沉桩中桩周土的竖向位移、径向位移、沉桩压力与沉桩深度的规律及最大竖向位移和径向位移.研究结果表明:在相同地质条件下,楔形桩周土的竖向位移和径向位移分别随沉桩深度、楔角的增大而不断下沉并靠近桩中心；最大竖向位移和径向位移均出现在1倍平均桩径处,最大竖向位移为平均桩径的5.78％～9.45％,最大径向位移量为平均桩径的0.92％～2.04％;楔形桩沉桩所需的沉桩压力随桩深度、楔角的增大而不断增加,且增加的速率越大.

Model experimental research on piling effects of static piling in soft clay ground with tapered pile

To study piling influence of tapered pile and uniform section pile during static piling,four static piling tests with one uniform section pile and three tapered pile with different tapers were performed in foundation pit filled with soft clay,respectively.Based on experimental results,a series of laws on piling influence,relationship between vertical displacement of surrounding soil and piling depth,relationship between radial displacement and piling depth,relationship among piling pressure and piling depth,the position and value of maximal vertical displacement and radial displacement,were obtained respectively.The results show that,under the same geological condition,vertical and radial displacement of soil surrounding tapered pile respectively increases with the increase of the pile sinking depth and taper angle,both the position of the maximum vertical and radial displacement are near the position distance,the maximum vertical displacement value is 5.78%?9.45% of the average pile diameter,and the maximum radial displacement value is 0.92%?2.04% of the average pile diameter.The piling pressure increases,and the increasing velocity is enhanced with the increase of the pile sinking depth and taper angle.