离散单元法分析隔振沟引起的强夯变形和应力变化

为有效分析隔振沟对强夯引起的土体变形和应力的影响, 基于二维离散元法理论和已有的砂土地基强夯离心机试验, 建立了强夯的地基处理模型, 研究了隔振沟深度和位置对地基表面隆起的影响, 从颗粒尺度方面对隔振沟外 3 m 范围内的应力变化进行了探讨. 结果表明: 隔振沟可以有效减小地基表面的隆起变形, 但隔振沟位置和深度对地表的隆起变形影响较小; 隔振沟对应力变化的影响随观测点深度的增加逐渐减小, 当深度达到地面以下 4 m 时, 隔振沟的设置对远离震源一侧监测点处的应力变化影响很小.

Effect of an isolation trench on deformation and stress induced by dynamic compaction based on the discrete element method

To analyze the influence of an isolation trench on the foundation deformation and stress induced by dynamic compaction, based on two-dimensional discrete element theory and a previous centrifuge model test of a sand foundation under dynamic compaction, a foundation model under dynamic compaction was established. The influence of depth and location of the isolation trench on the upheaval of the ground surface was studied. The stress variation in the range of 3 m outside the trench was discussed at a grain level. The results show that an isolation trench can effectively reduce the upheaval deformation of the ground surface; however, the location and depth of the isolation trench have little effect on it. The influence of the isolation trench on the stress change gradually decreases with the increase of the depth of the monitoring point. At a depth of >4 m below the ground, the effect of the isolation trench on the stress change far from the center of the ramming pit is very small.