饱和粘土中静压桩挤土效应的离心模型试验研究

通过静压桩在不同粘土中贯入的离心模型试验，对桩体贯入饱和粘土时的土体位移和初始超孔压的空间分布情况进行了研究，研究结果表明土体径向位移在水平方面具有对数递减的规律，而在竖向２／３桩长范围内呈线形增加分布，约在２／３桩长处增加到最大值，在其下范围内逐渐减小，直至桩尖以下约５￣１０桩半径处衰减为零；试验结果同时表明，大部分桩长范围内，初始超孔压具有孔随计算点至桩轴水平距离的加大而呈对数减小、随深度的加

Centrifugal Model Tests of Piles Jacked in Saturated Clay

Centrifugal model tests of piles jacked in saturated clay are conducted, and the modes of soil displacements and initial excess pore water pressures generated during pile penetration are studied. It is shown that both the radial displacements of the soil and the initial excess pore water pressure decrease logarithmically with increasing distance from the pile axis in the horizontal direction. In the depth direction, radial displacements of the soil increase in the upper 2/3 area;below that it begins to decrease. The initial excess pore water pressure increases linearly with the depth in the area from the ground to the pile tip. Also obtained is the scope in which the initial excess water pore pressure is obvious. It is shown that it is necessary to conduct spatial analysis on pile jacking.