摘要
管袋堤坝龙口封堵过程受水力作用明显,易出现袋体滑移失稳的现象,导致龙口封堵失败,造成施工成本增加和工期延误。为减小失败的风险,本文在理论分析的基础上,采用FLOW 3D和FLAC 3D数值模拟软件对过水堰顶管袋进行稳定分析,并与实际工程进行对比。结果表明:1)堰顶过流产生的静水压力和水流水平推力是顶袋发生滑移失稳破坏的主要因素。2)滑移临界水头与顶袋袋体宽度、袋体间等效摩擦系数、袋体充填密度呈正相关。3)预测公式计算结果与工程实际较为相符,具有一定的工程参考价值。
The blocking process of the geotextile tube in the closure gaps is obviously affected by hydraulic force,and the geotextile tube is prone to slip and instability,which leads to the failure of the blocking of the junctions,resulting in increased construction costs and delays in the construction period.To reduce the risk of the failure,based on the theoretical analysis,this paper uses the FLOW 3D and FLAC 3D numerical simulation software to analyze the stability of the weir top geotextile tube,and compares it with the actual project.The results show that:1)The hydrostatic pressure and the horizontal thrust of the water flow generated by the overflow at the top of the weir are the main factors for the slip failure of the top geotextile tube.2)The sliding critical head is positively related to the width of top bag,the equivalent friction coefficient between bags and the weight of bag filling.3)The calculation results of the prediction formula are more consistent with the actual engineering,and have certain engineering reference value.
作者
李庆
杨刚
刘世通
LI Qing;YANG Gang;LIU Shi-tong(College of Engineering and Architecture,Beibu Gulf University,Qinzhou 535011,China;CCCC TDC Southern Communication Co.,Ltd.,Shenzhen 518101,China;Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650504,China)
出处
《水运工程》
北大核心
2023年第1期170-174,共5页
Port & Waterway Engineering
基金
广西教育厅高校科研项目(2022KY0414)
钦州学院高层次人才科研启动项目(2019KYQD43)。
关键词
土工管袋
龙口封堵
稳定分析
临界水头
预测公式
geotextile tube
closure gaps blocking
stability analysis
critical head
prediction formula
