深中通道沉管隧道水下基槽开挖边坡稳定性分析  

Slope stability analysis of underwater trench excavation based on the Shenzhen-Zhongshan Link immersed tunnel

作　　者：刘旭 刘文彬[1,2,3,4] 张瑞棋 喻志发 尹瑞龙[1,3,4] LIU Xu;LIU Wen-bin;ZHANG Rui-qi;YU Zhi-fa;YIN Rui-long(Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300222,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China;Key Laboratory of Port Geotechnical Engineering of Ministry of Communications,Tianjin 300222,China;Key Laboratory of Port Geotechnical Engineering of Tianjin,Tianjin 300222,China)

机构地区：[1]中交天津港湾工程研究院有限公司,天津300222 [2]中交第一航务工程局有限公司,天津300461 [3]港口岩土工程技术交通行业重点实验室,天津300222 [4]天津市港口岩土工程技术重点实验室,天津300222

出　　处：《中国港湾建设》2024年第9期29-35,共7页China Harbour Engineering

基　　金：中交一航局科技研发资金支持项目(2022-7-15)。

摘　　要：在沉管隧道整体施工过程中,特别是外海沉管隧道,其深基槽通常面临海流作用复杂、基槽泥沙回淤等问题,给基槽边坡的安全稳定性带来不利影响。以深中通道沉管隧道工程为背景,采用数值模拟方法,通过对边坡形态、边坡回淤物分布以及海流荷载等因素的研究,分析了在相应条件下水下基槽边坡的安全系数和破坏特性。结果表明,边坡的土体特性与几何形态、边坡回淤物的分布与厚度以及海流荷载的大小与方向的变化均会对基槽边坡的稳定性造成不同程度的影响。In the whole construction process of immersed tunnels,especially those in offshore areas,the deep foundation trench typically faces issues such as the complex influences of ocean currents and sediment siltation,which adversely affect the safety and stability of the trench slopes.Based on the Shenzhen-Zhongshan Bridge immersed tunnel project,the safety factors and failure characteristics of underwater trench slopes in the corresponding conditions were analyzed by numerical simulation method through the research of factors such as slope morphology,the distribution of sediment siltation on the slope,and the ocean current loads.The results indicate that the soil characteristics and geometric shape of the slope,the distribution and thickness of sediment siltation,and the magnitude and direction of ocean current load could all have varying degrees of impact on the stability of the foundation trench slope.

关 键 词：水下边坡 回淤物 海流荷载 边坡稳定 

分 类 号：U655.542[交通运输工程—港口、海岸及近海工程] U459.5[交通运输工程—船舶与海洋工程] TU432[建筑科学—桥梁与隧道工程]