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SIMULATION TEST OF STRESS AND PORE WATER PRESSURE INDUCED BY PILE PENETRATION

机译：桩穿透引起的应力与孔隙水压力模拟试验

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The changes of strain,stress and pore water pressure in soil caused by pile penetration is rarely investigated by stress-path controlled triaxial tests.The changes during pile penetration can be simulated through stress-path controlled triaxial test.The stress-path controlled triaxial tests were carried out on five samples of normal consolidated mucky clay or silt clay at different depths.It is found that the heights of the samples prepared horizontally increased during K0 consolidation.The increase in sample height was larger for samples with smaller Possion' s ratio.In loading process,the total stress and the effective stress increased continuously with the increasing in strain without softening.The pore water pressure increased quickly initially and tended to a stable value when the strain is large.The pore water pressure coefficient increased first and then decreased with the increase in stress.A peak value of the pore water pressure appeared.With the dissipation of the pore water pressure,the consolidation coefficients were smaller for samples with higher initial strain and vice versa.The lateral effective stress and the average value of the lateral stress coefficient increased.
机译：应力路径控制三轴试验很少研究桩穿透引起的土壤中的应变，应力和孔隙水压力的变化，可以通过应力路径控制三轴试验模拟桩穿透过程中的变化。对5个普通固结的泥质或粉质黏土样品在不同的深度进行了测试，发现在K0固结过程中，水平制备的样品的高度增加了，而位置比较小的样品的增加幅度更大。在加载过程中，总应力和有效应力随着应变的增加而连续增加而不软化。孔隙水压力开始迅速增加，当应变较大时趋于稳定值。孔隙水压力系数先增加后减小随着应力的增加，出现了孔隙水压力的峰值，随着孔隙水的消散初始应变较高的样品，固结系数较小，反之亦然。横向有效应力和横向应力系数的平均值增大。

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