堤坝涵管接触冲刷破坏模式分析  

Analysis of failure modes of conduits through embankment dams due to contact erosion

作　　者：孙东亚[1,2] 姚秋玲[1,2] 赵雪莹 SUN Dongya;YAO Qiuling;ZHAO Xueying(China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Research Center on Flood&Drought Disaster Reduction of the Ministry of Water Resources,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院,北京100038 [2]水利部防洪抗旱减灾工程技术研究中心,北京100038

出　　处：《中国水利水电科学研究院学报》2021年第2期276-280,共5页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家重点研发计划课题(2017YFC1502602)。

摘　　要：本文分析总结了涵管与堤坝土体结合面区域土体渗透变形或接触冲刷破坏影响因素,主要包括涵管材料、裂缝或孔洞、回填土性质、水头、水流类型、设计因素等。从后向侵蚀管涌和内部侵蚀机理出发,归纳了4种堤坝涵管接触冲刷破坏模式,即土颗粒流失进入无压涵管导致土体发生内部侵蚀、压力涵管内水外溢导致的内部侵蚀、沿涵管周围土体产生后向侵蚀管涌或内部侵蚀和涵管附近土体裂缝导致的内部侵蚀。应用连续统概念模型阐述了接触冲刷破坏发生发展过程和可能防御措施,有助于堤坝涵管工程设计、施工和后期运行管理。This paper analyses and summarizes the influencing factors of seepage deformation or contact ero⁃sion failure in the interface area between conduits and embankment,such as the conduit materials,crack or opening,the characteristic of soil,water head,pressure or non-pressure water flow,design and so on.Based on the mechanism of backward erosion piping and internal erosion,four kinds of contact erosion fail⁃ure modes are summarized as potential internal migration into a crack or joint in a conduit,internal ero⁃sion along cracked pressure conduit,internal erosion along the interface of conduit and embankment,inter⁃nal erosion caused by the crack or opening in the embankment near the conduit.The development process and possible preventive measures of contact erosion failure are expounded by using continuum conceptual model,which is helpful to the design,construction and operation management.

关 键 词：接触冲刷 内部侵蚀 破坏模式 涵管 

分 类 号：TV698.23[水利工程—水利水电工程]