岩土工程学报2025，Vol.47Issue(z1)：261-265,5.DOI:10.11779/CJGE2025S10023
高速公路改扩建新老路基沉降变形规律研究
Settlement and deformation laws of new and old subgrades in reconstruction and extension of expressways
摘要
Abstract
The differential settlement and settlement control of the new and old road foundations are the important problem faced by the reconstruction and expansion projects in soft soil areas.In this study,the settlement monitoring of the new and old roadbeds in reconstruction and expansion of expressways is carried out.The settlement monitoring results are analyzed,the settlement of the new and old roadbeds is calculated by using the hyperbolic model,and the differential settlement control effects of different soft foundation treatment methods are evaluated.The results show that the cross section settlement of the old and new road foundations of the reconstruction and expansion of expressways presents"W"type settlement,that is,the settlement of the new roadbed at both sides is large,and that of the original roadbed in the middle is small.The settlement of the subgrade of the newly built road is large in the filling period,but small after entering the stable period.The filling of the embankment of the new road has small influences on the settlement of the old road foundation.Based on the hyperbolic model,the final settlement of the newly built roadbed is 82.52 mm,and it is 80.01mm in 15 years after construction.The final settlement of the old road foundation is 20.79 mm,and it is 19.15 mm in 15 years after construction.The best effects for soft soil subgrade treatment is to use PC pipe piles,and the differential settlement control of new and old subgrades after soft foundation treatment is significantly better than that of untreated subgrade.关键词
软基/沉降监测/双曲线模型/软基处理/不均匀沉降控制Key words
soft foundation/settlement monitoring/hyperbolic model/soft foundation treatment/differential settlement control分类
建筑与水利引用本文复制引用
李兴明,祝希,石得权,秦磊,王才进,王蒙..高速公路改扩建新老路基沉降变形规律研究[J].岩土工程学报,2025,47(z1):261-265,5.基金项目
湖北省教育厅科学研究计划指导性项目(B2023296) （B2023296）
