【摘要】 通过数值模拟分析了高速公路碎石桩复合地基在桩体施工、路堤填筑、运行期全过程问题和地震动荷载作用等问题。计算结果表明:碎石桩在路堤的填筑和运行期起到明显的排水固结作用,当桩长大于6 m后复合地基中的孔压最大值变化较缓慢;在桩长大于10 m后路堤底面的沉降量和坡脚的水平位移量变化均较小。地震荷载作用下路堤顶部的水平向加速度峰值较底面大;在碎石桩加固范围内,复合地基的水平刚度大于天然地基,而在整个地基内,复合地基的竖向刚度均大于天然地基,在地基刚度较大的情况下位移最大值较大;天然地基在路堤坡脚下方、路堤边坡等位置较易发生液化,经过碎石桩加固后降低了地基液化的可能性。更多还原

【Abstract】 A numerical analysis is studied on the construction,runtime and earthquake condition of composite ground reinforced by stone columns.The calculated results indicate that the stone columns have significant effect on drainage of the excess pore pressure under construction and runtime;when the pile length is larger than 6 m,the maximum pore pressure changes slowly;when it is larger than 10 m,the settlement under embankment and horizontal displacement under slope toe change slowly.Under earthquakes the maximum acceleration at the top of the pave is larger than that at the bottom of the model;in reinforced scope,the horizontal stiffness of composite ground is larger than that of natural foundation;in the whole ground,the vertical stiffness of composite ground is larger than that of natural foundation,and the maximum displacement is larger in large stiffness ground;the toe position and slope of embankment are easy to be liquefied under earthquakes,but stone column composite ground can reduce the possibility of liquefaction.更多还原