软土地区引水沉井沉降预测  

Settlement prediction of water diversion open caisson in soft soil area

作　　者：林小飞 马泉坤 刘越 吴慧明 LIN Xiao-fei;MA Quan-kun;LIU Yue;WU Hui-ming(Kaitian Engineering Technology Co.,Ltd.,Ningbo 315000,Zhejiang,China)

机构地区：[1]浙江开天工程技术有限公司,浙江宁波315000

出　　处：《地基处理》2024年第3期305-311,共7页Journal of Ground Improvement

基　　金：宁波市水利科技计划项目(NSKA202106);宁波市交通运输科技计划项目(NO.202106);宁波市科技计划项目(2019B10047)。

摘　　要：软土地区用于穿管用的沉井回填期间及回填后的沉降直接关系到引水管线安全,但现有计算理论很难对沉井沉降进行可靠预测,尤其是软土地区采取了各种减沉措施的沉井沉降。本文选取宁波软土地区一重大引水工程,对2个采取减沉措施的工作沉井和2个未采取减沉措施的接收沉井进行了沉降变形长期跟踪监测,监测结果表明:该区域沉井下沉性状与沉井参数关系较小;沉井沉降主要发生在沉井回填施工期间,回填完成后10 d内沉降基本稳定;对4个沉井的沉降监测数据进行分析统计,通过多个回归模型对比后发现,双曲线模型预测法具有较好适配性,预测曲线与实测沉降曲线良好吻合,可用作引水全线沉井沉降的预测,为该区域引水管线的安全提供可靠的技术支持。The settlement of open caisson in soft soil regions significantly impacts the safety of water diversion pipelines.However,existing calculation theories are difficult to accurately predict open caisson settlement,particularly in soft soil areas implementing various settlement reduction measures.This work focuses on a significant water diversion project situated in the soft soil area of Ningbo.Long-term tracking monitoring was conducted on the settlement deformation of two working open caissons and two receiving open caissons.Monitoring results reveal that the sinking behavior of open caissons exhibits minimal correlation with caisson parameters within this locale.Settlement predominantly occurs during the construction stage of open caisson backfilling,and approaches stable within 10 d after backfilling completion.Analysis of settlement monitoring data from the four open caissons were performed.Through comparative assessment of multiple regression models,the hyperbolic model prediction method exhibits strong adaptability.Notably,the prediction curve closely aligns with the measured settlement curve,offering a reliable way to forecast open caisson settlement.This predictive capability furnishes valuable technical support for pipeline safety within this area.

关 键 词：沉井回填 沉降规律 工后沉降预测 双曲线法 实测曲线 

分 类 号：TU43[建筑科学—岩土工程]