深水嵌岩锁扣钢管桩围堰施工阶段力学特性分析  

Analysis of mechanical characteristics of deep-water rock-socketed locking steel pipe pile cofferdam in construction stage

作　　者：宁宏坤 Ning Hongkun(China Railway 11th Bureau Group First Engineering Co.,Ltd.,Xiangyang Hubei 441100,China)

机构地区：[1]中铁十一局集团第一工程有限公司,湖北襄阳441100

出　　处：《山西建筑》2025年第6期126-132,共7页Shanxi Architecture

基　　金：中铁十一局集团有限公司科技研发项目(项目编号:22-AⅡ-01)。

摘　　要：结合东南沿海地区某高速铁路特大桥11号墩承台深水嵌岩基础锁扣钢管桩围堰工程,利用Midas civil建立三维有限元模型,模拟设置施工过程中的不利工况,对围堰整体和关键构件的内力、变形和稳定性进行了有限元分析。结果表明:围堰的土方开挖主要引起第二、三道内支撑及标高101 m~114 m区间钢管桩的应力和位移显著增加,而其他区域的钢管桩和第一道内支撑受到的影响相对较小,应力和位移变化不显著;锁扣钢管桩围堰用作基坑开挖的防水结构,其强度、刚度和稳定性均达到规范标准。Based on the lock-up steel pipe pile cofferdam project of deep-water rock-socketed foundation of 11#pier cap of a high-speed railway super-large bridge in the southeast coastal area,Midas civil was used to establish a three-dimensional finite element model to simulate the unfavorable working conditions in the construction process,and the internal force,deformation and stability of the whole cofferdam and key components were analyzed by finite element method.The results show that the earth excavation of the cofferdam mainly causes the stress and displacement of the second and third internal supports and the steel pipe piles in the elevation of 101 m to 114 m to increase significantly,while the steel pipe piles and the first internal support in other areas are relatively less affected,and the stress and displacement changes are not significant.The lock-lock steel pipe pile cofferdam is used as a waterproof structure for foundation pit excavation,and its strength,stiffness and stability meet the standard.

关 键 词：深水嵌岩 锁扣钢管桩围堰 有限元模型 内力 变形 稳定性 

分 类 号：TU997[建筑科学—市政工程] U445.4[建筑科学—桥梁与隧道工程]