Kritičeskij gidravličeskij gradient jedinoabraznych adnarodnych stěklannych granul

Critical hydraulic gradient for uniform homogenous glass beads

miscellaneous

Russian

Damby plotiny izaščitnyje barjery ot navodněnija, postrojenije na pronicajemom pesčanom gruntě, mogut razrušaťsja iz-za processa procačivanija pod konstrukcijej. Vosmaja naučno-těchničeskaja konferencia "Giroeněrgetika-novyje razrabotki i těchnologii", 23.-25.10.2014, VNIIG, Sankt-Petěrburg, Rossija

Dams, levees and flood-walls built on permeable sandy soil can be susceptible to failure due to seepage under the structure. In uniform soils the initiation phase of progressive internal erosion usually starts with fluidization. The magnitude of volume forces is governed by the local hydraulic gradient at the exit of the seepage downstream of the structure. Extensive experimental research on uniform glass beads was carried out at the Laboratory of Hydraulic Research at Brno University of Technology (BUT) to estimate the critical hydraulic gradient, JC. In this paper, experimentally obtained JC values are compared with values obtained from formulae proposed by other authors. Other factors affecting JC, such as grain size and compaction rate, are discussed.

Kritičeskij gidravličeskij gradient; plotina

Critical hydraulic gradient; Internal erosion; Fluidization

ALHASAN, Z.; JULÍNEK, T.; ŘÍHA, J.; DUCHAN, D.

23. 10. 2014

Vedeneev All-Russian Research Institute for Hydroengineering (VNIIG)

Sankt-Peterburg, Russia

25

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