同济大学学报（自然科学版）2026，Vol.54Issue(3)：355-364,10.DOI:10.11908/j.issn.0253-374x.24353
基于各向异性本构的软土路基沉降机制与加固分析
Settlement Mechanism and Reinforcement Analysis of Soft Soil Subgrades Based on Anisotropic Constitutive Model
摘要
Abstract
Taking the deep soft soil subgrade project of the South Extension of Wanhuan West Road as the background,the K0-MCC model was embedded into the finite element software ABAQUS through secondary development of a UMAT subroutine to establish a finite element model of deep soft soil subgrades considering soil anisotropy.Settlements,pore water pressures,and horizontal displacements caused by subgrade filling were calculated.The model's validity was verified by comparison with field-measured data.The settlement and deformation mechanisms of deep soft soil subgrades were analyzed.Furthermore,by comparing the effectiveness of cement-mixed piles and prestressed pipe piles in controlling settlement,reinforcement methods suitable for deep soft subgrades were proposed.The results indicate that the initial stress anisotropy of the soil and stress-induced anisotropy have significant effects on the settlement and deformation of soft soil subgrades.The settlement during the two-stage surcharge of the deep soft soil subgrade reached 0.337 m,while the consolidation settlement occurring during the construction interval after the first surcharge was only 0.005 m.Within one year after the surcharge,as excess pore water pressure dissipated and the subgrade continued to bear load,settlement further developed,reaching a total of 0.366 m,with settlement generated during surcharge construction accounting for 92%of the total.After subgrade filling,settlements were larger at shallower depths and closer to the subgrade center.Compared with cement-mixed piles,prestressed pipe pile reinforcement is more effective in controlling construction settlement of deep soft soil subgrades,particularly in terms of total and long-term settlement control.关键词
软土路基/K0-MCC模型/UMAT子程序/各向异性/沉降机制/加固Key words
soft soil subgrade/K0-MCC model/UMAT subroutine/anisotropy/settlement mechanism/reinforcement分类
建筑与水利引用本文复制引用
焦文秀,雷博乾,刘细军,李林..基于各向异性本构的软土路基沉降机制与加固分析[J].同济大学学报（自然科学版）,2026,54(3):355-364,10.基金项目
国家自然科学基金(52108297,52578385) （52108297,52578385）
中央高校基本科研业务费资助项目(300102214303 （）
300102213302) （）
