在模拟公路桥涵台背回填中粗砂密实度检测的室内模型试验基础上,进行了三维有限元数值模拟分析。分析过程中,采用拉德(P.V.Lade)模型及刚—柔接触模型,模拟了平板载荷试验过程,获得了载荷板周围砂的应力、应变和位移场,验证了室内试验结果的正确性,揭示了载荷试验在回填中粗砂中的作用机理,可为今后类似的工程应用提供借鉴。 Based on the indoor model test of simulating the density of grit in backfill of bridge and culvert in highway, three-dimensional finite element numerical simulation is carried out. In the process of analysis, the PVLade model and the rigid-flexible contact model were used to simulate the process of the plate load test, and the stress, strain and displacement fields of the sand around the load plate were simulated. The correctness of the indoor test results was verified and revealed The action mechanism of load test in backfill grit can provide references for similar engineering applications in the future.