大型沉井流塑状粉质黏土地基固结排水分析  

Analysis of Consolidation and Drainage of Large Caisson Flow Plastic Silty Clay Soil Foundation

作　　者：于航 陈志坚[1] 王喆[1] YU Hang;CHEN Zhijian;WANG Zhe(College of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100

出　　处：《沈阳大学学报（自然科学版）》2024年第4期341-349,共9页Journal of Shenyang University：Natural Science

基　　金：江苏省政策引导类计划项目(BY2015002-05)。

摘　　要：为了探究一种加快沉井地基土体固结排水效率的施工方法及其对沉井结构受力安全性影响,基于南京长江河段某过江通道悬索桥锚碇大型沉井基础,开展实测和数值模拟分析,研究换填沙袋处理配合沉井对角浇筑方法在流塑状粉质黏土地基基础施工过程中的影响。结果表明:在沉井井壁和隔墙底部采取换填沙袋处理后,沉井浇筑和接高施工进度可不受粉质黏土排水固结过程控制,而主要取决于沉井结构混凝土强度的增长情况。换填沙袋地基处理可以提升固结排水效率,但容易出现地基不均匀现象,从而产生沉井结构受力安全性问题。In order to explore a construction method to accelerate the soil consolidation and drainage efficiency of caisson foundation and its influence on the mechanical safety of caisson structure,based on the anchorage foundation of a suspension bridge anchorage in a river-crossing channel in Nanjing,the effect of sandbag replacement treatment combined with caisson diagonal pouring method in the construction process of flow-plastic silty clay foundation was studied.The results showed that the construction progress of caisson pouring and elevation could not be controlled by the drainage and consolidation process of silty clay,but mainly depended on the growth of the concrete strength of the caisson structure after the sandbag replacement treatment was adopted at the bottom of the caisson wall and partition wall.The replacement sandbag foundation treatment could improve the efficiency of consolidation and drainage,but it was easy to have uneven foundations,resulting in the mechanical safety of caisson structures.

关 键 词：流塑状粉质黏土 固结排水 换填沙袋地基 沉井 有限元分析 排水效率 

分 类 号：TU457[建筑科学—岩土工程]