不同离心力下的离心机强夯试验模拟

Simulation of centrifuge dynamic compaction test under different centrifugal force

采用PFC3D对离心机强夯试验进行数值离散模拟,在与试验对比验证模拟结果正确的基础上,研究不同离心力对数值模拟结果的影响。在30g^70g离心力下,夯沉量结果近似一致,土体的孔隙率增量、配位数和竖向峰值应力都近似相等,说明土体被夯实,符合实际情况。但是,随着离心力继续增大,即离心力在80g、90g和100g的情况下,夯锤下落时出现倾斜现象,且由于模型偏小,影响模拟数据的采集。总结认为,60g离心力为模型上限。数值模拟为研究不同离心力下的数值强夯试验提供参考。

The discrete numerical simulation of centrifuge dynamic compaction test is carried out using PFC3D. The simulation results are verified by the comparison with test, and then the influence of different centrifugal forces on numerical simulation results is studied. When the centrifugal force is within 30g to 70g, the crater depth, porosity increment, coordination number and vertical peak stress of soil are approximately equal. It shows that the soil is compacted, which is in accordance with the actual situation. However, as the centrifugal force continues to increase, that is, when the centrifugal force is 80g, 90g and 100g, the rammer inclines when it falls. Because the model is too small, the collection of simulation data is affected. It is concluded that the upper centrifugal force limit of the model is 60g. The numerical simulation can provide reference for the study of numerical dynamic compaction test under different centrifuge forces.