IS 2720 : Part 36 : 1987 Methods of test for soils: Part 36 Laboratory determination of permeability of granular soils (constant head)

1 Scope

1.1 This standard (Part 36) describes the method for determiningcoefficient of permeability of granular soils by a constant headmethod and under conditions of laminar flow of water. This methodis suitable for disturbed granular soil containing less than 10percent soil passing 75-micron IS Sieve, the type of material usedfor construction of embankments and base courses under pavements

1.1.1 Prerequisite for laminar flow of water through granularsoils is that, water shall flow below critical velocity so thatthere is no movement or disturbance of soil particles; moreover,water shall flow through saturated soil voids without havingbubbles in them, and there shall be no change in soil volume norany change in hydraulic gradient during the performance of thetest.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 2720 : Part 4 :1986 Methods of test for soils: Part 4 Grainsizeanalysis