大回淤条件下回淤物流变特性试验研究  

Experimental study on rheological properties of sedimentation under strong deposition condition

作　　者：刘文彬[1,2] 刘瑞建 王雪奎 申秋华 LIU Wen-bin;LIU Rui-jian;WANG Xue-kui;SHEN Qiu-hua(Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Key Laboratory of Geotechnical Engineering,CCCC,Key Laboratory of Port Geotechnical Engineering,Ministry of Communications,PRC,Key Laboratory of Port Geotechnical Engineering of Tianjin,Tianjin 300222,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China;Naval Logistics Academy,Tianjin 300450,China)

机构地区：[1]中交天津港湾工程研究院有限公司,中交集团岩土工程重点实验室,港口岩土工程技术交通行业重点实验室,天津市港口岩土工程技术重点实验室,天津300222 [2]中交第一航务工程局有限公司,天津300461 [3]海军勤务学院,天津300450

出　　处：《中国港湾建设》2025年第4期56-63,102,共9页China Harbour Engineering

摘　　要：沉管隧道基槽开挖完成至沉管管节下放安装之间,存在一定的时间间隔。由于基槽改变了原有河床的地貌,在此施工间隔期内,基槽中容易产生回淤。在沉管下放安装时,未被挤出的回淤物会影响沉管的高程,并在后期产生不均匀沉降等不利影响,威胁沉管隧道的安全。因此,在大回淤条件的场地施工时,需要明确合理的清淤标准。文章依托室内大比尺试验,对回淤物在竖向沉放压力下的流动进行了研究,分析不同条件下回淤物的挤出情况,为明确回淤物的流变特性提供数据支撑。Between the process of foundation trench digging and the process of tunnel tube installation,there is a certain time interval.Due to the change in the original riverbed topography caused by the foundation trench digging,sedimentation deposition is prone to occur in the trench during the construction interval.During the installation of the immersed tubes,the sediment that has not been squeezed out can affect the elevation of the immersed tubes and lead to uneven settlement in the later stages,posing a threat to the safety of the immersed tube tunnel.Therefore,clear and reasonable dredging standards are needed for construction in sites with strong deposition conditions.Based on the indoor large-scale model tests,the flow of sediment under vertical pressure was studied,and the extrusion of sediment under different construction conditions was analyzed,which provides a data support for determining rheological properties of sediment.

关 键 词：沉管隧道 回淤物 室内试验 塑性流动 流变 

分 类 号：U652[交通运输工程—港口、海岸及近海工程]