堤坝涵管接触冲刷破坏模式分析

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...

Analysis of failure modes of conduits throug

This paper analyses and summarizes the influencing factors of seepage deformation or contact erosion 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 failure modes are summarized as potential internal migration into a crack or joint in a conduit, internal erosion along cracked pressure conduit, internal erosion along the interface of conduit and embankment, internal 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.