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A comparative analysis of initiation indices for concentrated flow-induced crack erosion in
dam and embankment

1 1 2 3
LI Weichao ，SHANG Jingshi ，LI Shaopeng ，TANG Bin
（1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，
China Institute of Water Resources and Hydropower Research，Beijing 100038，China；
2. Beijing Engineering Corporation Limited，Powerchina，Beijing 100024，China；
3. China Water Investment Co.，Ltd，Beijing 100053，China）

Abstract：Piping and crack erosion are the popular phenomena of seepage-induced failure. But research on
crack erosion is relative scarce comparing to piping，and different initiation indices for crack erosion are of⁃
ten used. Referred to the research on hydraulic erosion by other subjects， such as sediment dynamics，
scour of bridge foundation， and soil erosion， and based on the hydraulic analysis of concentrated flow in
the crack， comparative analysis of initiation indices is conducted for concentrated flow-induced crack ero⁃
sion in dam and embankment. It shows that hydraulic gradient and velocity can be measured directly，and
hydraulic shear stress is difficult to measure. But as a crack erosion index，hydraulic stresses can be calcu⁃
lated without being influenced by the width of the crack，and this index can be used to express the initia⁃
tion and development of crack erosion. Through comparative analysis， hydraulic stress is recommended to
be used as an initiation index for concentrated flow-induced crack erosion in dam and embankment.
Keywords：concentrated flow；erosion；hydraulic shear stresses；crack；dam and embankment

（责任编辑：王学凤）

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