汉江雅口航运枢纽管袋砂过水围堰稳定性分析  

Stability of overtopped cofferdam with tubes of sand filling in Yakou navigation hub of Hanjiang River

作　　者：朱凡 童富果 肖艳斌[3] 李彪 ZHU Fan;TONG Fuguo;XIAO Yanbin;LI Biao(Hubei Key Laboratory of Hydropower Engineering Construction and Management,China Three Gorges University,Yichang 443002,China;College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,China;China Gezhouba Group Co.,Ltd.,Wuhan 430033,China)

机构地区：[1]三峡大学,湖北省水电工程施工与管理重点实验室,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002 [3]中国葛洲坝集团股份有限公司,湖北武汉430033

出　　处：《水运工程》2023年第7期188-195,共8页Port & Waterway Engineering

基　　金：国家自然科学基金项目(51939004)。

摘　　要：雅口航运枢纽二期围堰是采用河砂填筑、管袋砂护坡、复合土工膜防渗、土工布反滤、丙纶布防冲的新型复合结构,过水条件下易诱发围堰失稳问题。以试验数据为支撑,从渗流、应力变形、稳定性角度分析复杂工况下围堰稳定安全性,对比土工布、丙纶布与管袋砂层间稳定性。结果表明:围堰过水对坡脚处渗透梯度影响明显,加固后可增强局部抗渗透破坏的能力;过水条件对围堰基坑侧边坡稳定最不利,加固后应力变形、整体稳定性满足规范要求;丙纶布与管袋界面摩擦作用小,存在层间滑动的可能,在丙纶布与管袋砂间布置土工布可有效提高层间稳定性。经2021秋季汉江特大洪水考验,围堰在挡、过水工况下均能稳定安全运行。The second phase cofferdam of Yakou navigation hub adopts a new composite structure featuring river sand filling,slope protection with tube of sand filling,composite geomembrane anti-seepage,geotextile anti-filtration,and polypropylene fabric anti-scouring,and the overtopped condition is easy to induce the instability of cofferdam.Based on the experimental data,this paper analyzes the stability and safety of cofferdam under complex working conditions from the perspectives of seepage,stress and deformation,and stability and compares the stability of geotextile,polypropylene fabric,and tube of sand filling layer.The results show that the effect of an overtopped cofferdam on the slope foot seepage gradient is obvious,and the local resistance to seepage damage can be enhanced after reinforcement.The overtopped condition is the most unfavorable to the stability of the side slope of the foundation pit of the cofferdam,but the overall stability and stress and deformation meet the requirements of the code after reinforcement.The friction between polypropylene fabric and tube of sand filling is small,and there is the possibility of interlayer displacement,but the geotextile between polypropylene fabric and tube of sand filling can effectively improve the stability between layers.After the test of the severe Hanjiang River flood in the autumn of 2021,the cofferdam can run stably and safely under water retaining and overtopped conditions.

关 键 词：过水围堰 管袋砂 渗流分析 应力变形 整体稳定性 层间稳定性 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]