渗透破坏作用下管涌土强度劣化机制及预测模型  

Strength Degradation Mechanism and Predictive Model of Piping Soils under Seepage Failure

作　　者：邱松楠 黎晓冬 周鹏展 QIU Song-nan;LI Xiao-dong;ZHOU Peng-zhan(Faculty of Secondary Vocational Education,The Open University of China,Beijing 100039,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Key Laboratory of Urban and Engineering Safety and Disaster Reduction of Ministry of Education,BeijingUniversity of Technology,Beijing 100124,China)

机构地区：[1]国家开放大学中职学院,北京100039 [2]南京理工大学机械工程学院,南京210094 [3]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《长江科学院院报》2025年第1期186-193,207,共9页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金重点项目(52130905);国家重点研发计划项目(2018YFC1505001)。

摘　　要：由于发展过程的隐蔽性和破坏后果的严重性,渗透破坏问题往往对涉水工程具有较大威胁。为研究管涌土在渗透作用下渗透破坏前后强度劣化特性,研发了土工内部冲蚀应力路径三轴仪。利用该装置围绕细颗粒含量、固结压力、水力梯度三种因素下强度劣化机制开展渗透破坏试验和三轴劣化试验。结果表明:细颗粒含量、固结压力和水力梯度因素对渗透破坏过程存在较大影响,从而影响管涌土的强度劣化性质,细颗粒含量和固结压力因素会降低管涌土的劣化度,而水力梯度因素则会显著提高管涌土的劣化度;采用双曲线函数对管涌土强度劣化度进行拟合,并通过数值模拟软件建立了渗透破坏强度劣化模型。研究成果可为涉水建筑物内部结构的强度分析以及溃坝等灾害的预测提供参考。Due to its concealed development process and severe consequences,seepage failure poses a significant threat to hydraulic engineering projects.To investigate the strength degradation characteristics of piping soils before and after seepage failure,an internal erosion stress path triaxial apparatus was developed for geotechnical testing.Seepage failure tests and triaxial degradation tests were conducted using this apparatus,considering the influences of three critical factors:fine particle content,consolidation pressure,and hydraulic gradient.Results revealed that:1)These three factors significantly impact the seepage failure process,thereby affecting the strength degradation behavior of piping soils.Specifically,higher fine particle content and consolidation pressure tend to mitigate the degree of degradation,while a higher hydraulic gradient significantly amplifies it.2)A hyperbolic curve function was used to model the degradation degree of piping soils,and a seepage failure strength degradation model was established through numerical simulation software.These findings provide valuable insights for the structural integrity analysis of hydraulic constructions and the prediction of seepage-related disasters.

关 键 词：渗透破坏 管涌土 劣化度 累计涌砂量 数值模拟 

分 类 号：TV16[水利工程]