標準號：IS 2720 Pt.36-1975
發布日期：1976/3/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard ( Part XXXVI ) describes the method for determining coefficient of permeability of granular soils by a constant head method and under conditions of laminar flow of water. This method is suitable for disturbed granular soil containing less than 10 percent soil passing 75-micron IS Sieve, the type of material used for construction of embankments and base courses under pavements.1.1.1 Prerequisite for laminar flow of water through granular soils are that water shall flow below critical velocity so that there is no movement or disturbance of soil particles; moreover water shall flow through saturated soil voids without having bubbles in them; and there shall be no change in soil volume nor any change in hydraulic gradient during the performance of the test.