Abstract：Numerical simulation has become an important method to investigate the soil arching mechanism in a piled embankment. The key lies in the need of reasonable constitutive model for embankment fill. A 2-D elastic-plastic finite element model simulating soil arching in a piled embankment is established. Three different constitutive models for embankment fill, such as Mohr-Coulomb model (MC), Hardening Soil model (HS) and Hardening Soil Small model (HSS) model, are used when the shape and effect of soil arching in a piled embankment are simulated by FEM. The results show that the shapes of the soil arch are all semi-elliptic from the three different soil constitutive models for embankment fill. By using HS and HSS models, the arch shapes, load sharing ratios of pile cap and the differential settlements between pile cap and subsoil are almost identical. Compared to HS or HSS model, when using MC model to model the embankment fill, the differential settlement between pile cap and subsoil is smaller and the load sharing ratio of pile cap is slightly larger. Moreover, when the height of embankment is relatively low, the soil arch from the MC model is much smaller than that from HS or HSS model. It is concluded that MC and HS models for embankment fill are recommended when the effect and shape of soil arching in a piled embankment are simulated numerically, respectively.
杨 涛 裴永盛. 桩承式路堤土拱数值模拟中路堤土本构模型的选择[J]. 土木工程学报, 2019, 52(S2): 7-13.
Yang Tao Pei Yongsheng. Study on embankment fill constitutive model in numerical simulation of#br#
soil arching in a piled embankment. 土木工程学报, 2019, 52(S2): 7-13.
