基于Biot固结理论的闸基灌注桩基础变形计算  

Research on Deformation Calculationof Pile Foundation of Concrete⁃Filled Piles Based on Biot Consolidation Theory

作　　者：杨宁 刘灿 YANG Ning;LIU Can(Gansu Provincial Water Resources and Hydropower Survey and Design Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃省水利水电勘测设计研究院有限责任公司,甘肃兰州730000

出　　处：《人民黄河》2020年第7期126-130,共5页Yellow River

摘　　要：甘肃省张掖市黑河小孤山水电站枢纽采用闸坝型式,基础河床覆盖着深厚的淤泥质土,采用混凝土灌注桩群桩措施进行基础处理。为研究闸基处理后变形情况,采用Biot固结理论,基于有限元法对多工况下桩基变形进行计算,并将计算结果与后期运行中枢纽上游、中游和下游3排共计15个监测点连续106期的监测数据进行对比。结果表明:①工程从开挖至正常运行和发生地震情况的桩基变形有限元计算结果与按照规范计算的结果较为接近;②枢纽工程建设完成后对其进行连续监测,将监测数据与计算数据对比,二者基本吻合,基础处理方案合理、有效,计算方法合理;③混凝土灌注桩群桩基础的处理措施改善了淤泥质软土的剪切变形和不均匀沉降,为工程的安全运行提供了保障。The sluice and dam are used in the Xiaogushan Hydropower Station of Heihe River in Zhangye City,Gansu Province.The river bed of the foundation is covered with deep silty soil and the foundation treatment is carried out by concrete grouting pile group piles.In order to study the deformation of sluice foundation after treatment,Biot consolidation theory was used to calculate the deformation of pile foundation under multiple conditions based on finite element method.Then the calculation results were compared with the monitoring data for 106 consecutive pe⁃riods of 15 monitoring points in 3 rows of upstream,middle stream and downstream of the later operation hub.The results show that a)the re⁃sults of pile foundation deformation base on finite element calculation method from excavation to normal operation and earthquake occurrence are close to those calculated according to the specifications;b)continuous monitoring is carried out after completion of complex project construc⁃tion,and the monitoring data are basically in agreement with the calculation data,which shows that the foundation treatment scheme is reasona⁃ble,effective and the calculation method is reasonable and;c)treatment measures for pile group foundation of concrete cast⁃in⁃place piles im⁃prove shear deformation and uneven settlement of silty soft soil,which provides guarantee for safe operation of the project.

关 键 词：BIOT固结理论 闸基 混凝土灌注桩群桩 变形计算 

分 类 号：TU473.1[建筑科学—结构工程]