This line separates a saturated soil mass from an unsaturated soil mass. Figure 9.1.2–7 shows contours of saturation that indicate a region of fully saturated material under the phreatic zone and decreasing saturation in and above the phreatic zone.

Plotting of Phreatic Line In order to draw flow net, it is first essential to find the location and shape of Phreatic line or top flow line separating Saturated and Unsaturated Zones. Hydrostatic pressure acts below the phreatic line whereas atmospheric pressure exists above the phreatic line. It is not an equipotential line, but a flow line. Equipotential lines h. hp1 Flow Lines. This phreatic surface compares well with the analytical phreatic surface calculated by Harr (1962), shown in Figure 9.1.2–2. Phreatic surface the top flow line Equipotential lines - line of constant total head - … Title: Soil Mechanics A 1 Flow Nets 2 Flow through a Dam Phreatic line Unsaturated Soil Drainage blanket Flow of water z x 3 Graphical representation of solution 1. Head reference line 24 Equipotentials. A homogeneous dam (Fig. 6.1) is one that is composed almost entirely of the ... occurs under the steady-state seepage condition due to the softening and weakening of the soil mass when the top flow line or phreatic line intersects it. … Equipotentials Lines of constant head, h(x,z) Equipotential (EP) 4 Graphical representation of solution 2. Procedure for drawing flow nets : Procedure for drawing flow nets Mark all boundary conditions Draw a coarse net which is consistent with the boundary conditions and which has orthogonal equipotentials and flow lines. SEEPAGE THROUGH DAMS 6.1 TYPES OF DAMS The type of earth or earth and rockfill dam that is constructed at a particular location is usually dictated by the local availability of appropriate materials such as quarried rock, gravel, sand, silt or clay. Phreatic Line and Horizontal Drain In Earth fill Dams: Advertisements. 6. Elevation head reference line/datum.

Seepage Control for Tailings Dams by Earle J. Klohn, President, Klohn Leonoff Consultants Ltd., Richmond, British Columbia, Canada 1. Flow Lines Jarak terdekat/terkecil untuk air keluar Phreatic surfa ce. (It is usually easier to visualise the pattern of flow so start by drawing the flow lines). ‘Thanks for A2A’ Phreatic line also known as the seepage line or saturation line is an imaginary line which separates saturated zone from unsaturated zone in an earthen dam.

the starting point of the phreatic line. The top flow line of a saturated soil mass below which seepage takes place, is called the Phreatic line. phreatic line has been lowered down effectively by the central clay core. Graphical Method or Casagrande Method 2. Phreatic line can be located by 1.



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