高填方下土体本构模型对波纹钢管涵结构影响分析OA

Under conditions of high fill and deep burial,the confining pressure in the fill mass becomes extremely high,and the constant-modulus linear elastic model cannot adequately reflect the nonlinear deformation characteristics of the soil.To evaluate the influence of soil constitutive model selection on the structural response of a deeply buried corrugated steel pipe culvert under high confining pressure,a 70 m deeply buried corrugated steel pipe culvert located in the lower reservoir spoil disposal site of a pumped-storage power station is selected as the study object.Under unified geometric model,boundary conditions,and layered construction sequence,a comparative analysis is carried out between the linear elastic soil constitutive model and the Duncan-Chang nonlinear soil constitutive model.The results show that the maximum crown settlement predicted by the nonlinear model is approximately 13%greater than that predicted by the linear elastic model,while the maximum circumferential compressive stress increases by about 10%.The two models exhibit consistent main response distribution patterns and identical strength assessment results.This indicates that the selection of the soil constitutive model has a significant effect on the prediction of structural deformation,but only a limited influence on strength assessment.For high-fill deeply buried projects governed mainly by deformation control,the nonlinear constitutive model is more reasonable.The results can provide a reference for the numerical analysis of similar high-fill buried structures in Jiangsu Province.