摘要
新老路地基差异沉降和沉降控制是软土地区改扩建工程面临的重要难题。对高速公路改扩建新老路基进行沉降监测,对沉降监测结果进行分析,使用双曲线模型对新老路基沉降进行计算,并对不同软基处理方式的差异沉降控制效果进行评价。结果表明:高速公路改扩建新老路地基横断面沉降呈现“W”型沉降,即道理两侧新建路基沉降大,中间原有路基沉降小;新建道路的路基在填筑期沉降量较大,进入稳定期后沉降量较小,新路路堤的填筑对老路地基沉降的影响较小;模型预测结果表明:新老路基的长期沉降表现出显著差异,其中新建路段15 a后的沉降量接近80.01mm,最终将达到82.52 mm;相比之下,老路地基15 a后的沉降仅为19.15 mm,最终沉降量预测为20.79 mm;扩建软土路基处理效果最好的是PC管桩,经过软基处理后的新老路基差异沉降控制明显优于未处理的地基。
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.
作者
李兴明
祝希
石得权
秦磊
王才进
王蒙
LI Xingming;ZHU Xi;SHI Dequan;QIN Lei;WANG Caijin;WANG Meng(Hubei Land Resources Vocational College,Wuhan 430090,China;College of Civil Engineering and Architecture,Xinjiang University,Urumgi 830047,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,China)
出处
《岩土工程学报》
北大核心
2025年第S1期261-265,共5页
Chinese Journal of Geotechnical Engineering
基金
湖北省教育厅科学研究计划指导性项目(B2023296)。
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
soft foundation
settlement monitoring
hyperbolic model
soft foundation treatment
differential settlement control
