Constant head

ASTM D 2434 Constant Head Permeability Test CIVE 310 Soil Mechanics Civil, architectural, & Environmental Engineering Department Drexel University

Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Darcy’s Law ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Purpose and Significance Purpose: Determine the permeability, k, (hydraulic conductivity) of soils by appropriate test method. Significance : Permeability is necessary for the calculation of seepage through earth dams or under sheet pile walls, the calculation of the seepage rate from waste storage facilities (landfills, ponds, etc.), and the calculation of the rate of settlement of clayey soil deposits.

Test Method ,[object Object],[object Object],[object Object],[object Object],[object Object]

Typical Soil Permeability The constant head test method is used for permeable soils (k>10 -4 cm/s), and the falling head test is mainly used for less permeable soils (k<10 -4 cm/s).

Test Apparatus Permeameters Ruler Tamper Balance Watch (or Stopwatch) Thermometer Filter

Test Procedure ,[object Object],[object Object],[object Object]

Test Procedure (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Calculation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Extended Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Graph ,[object Object],Permeability at 20 o C Void ratio

Constant head

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Constant head