首页|Study on the hydrodynamic mechanics and soil mechanical characteristics under the phenomenon of river-bottom tearing scour (RBTS)
Study on the hydrodynamic mechanics and soil mechanical characteristics under the phenomenon of river-bottom tearing scour (RBTS)
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NETL
NSTL
Elsevier
River-bottom tearing scour (RBTS) refers to the phenomenon wherein clay layers formed by the deposition and solidification of extremely fine cohesive sediment are uplifted, and exposed to the water surface during the hyperconcentrated floods. While prior research has established the conditions for RBTS occurrence, its underlying physical mechanisms remain unclear. In this study, to investigate the hydrodynamic mechanics and soil mechanical characteristics associated with the RBTS phenomenon, a series of direct shear tests on clay blocks collected from river reaches prone to the RBTS phenomenon and flume experiments simulating the RBTS phenomenon were conducted. The former direct shear tests revealed that the clay blocks generally possess high shear strength, a characteristic strongly influenced by their water content and grain size gradation. Observations from the latter flume experiments showed pronounced turbulence around the clay blocks, with measurement data indicating that the vertical distributions of flow velocity and turbulence intensity during the RBTS phenomenon are governed by the discharge, scour pit depth and rotation angle of the clay blocks... The aforementioned turbulence was identified as the source of uplift force on the clay block, while the high shear strength of unsaturated clay blocks enables them to resist fragmentation during uplift, thereby contributing to the characteristic RBTS formation process. Moreover, empirical expressions for the vertical distribution of longitudinal flow velocity, as well as the shear strength of clay blocks during the RBTS phenomenon were proposed. The conclusions in this paper can provide new insights into the hydrodynamic mechanism and soil mechanical characteristics underlying the RBTS phenomenon.
NETL
NSTL
Elsevier
