Seepage failure of soil under various flow conditions –theory experiment

摘要

Seepage failure of soil under various flow conditions is discussed: two-dimensional flow (2Drnflow), two-dimensionally concentrated flow (2DC flow) and axisymmetric flow (AXS flow). The normalizedrnnon-dimensional formulation of critical hydraulic head difference between up- and downstream sides, Hc, isrnfirst discussed. It is confirmed that the D/T and Hc_γ_w/T_γ’ relationship is an appropriate representation of seepagernfailure phenomena, where D is the penetration depth of sheet piles, T the total depth of soil, γ_w the unitrnweight of water and γ’ the buoyant unit weight of soil. For the same penetration ratio of sheet piles D/T, H_crnvalues are given as follows in the order of magnitude: (1D flow assumed) < (AXS flow) < (2DC flow) < (2Drnflow), in which 1D flow assumed is the flow under the assumed condition where the head difference is entirelyrnconsumed in the soil within the walls. It is shown that the experimental results coincide with theoretical relationshipsrnbetween D/T and H_cγ_w/T_γ’ for the three flow conditions.