METHOD FOR GROUND FILTRATION PROPERTIES DETERMINATION Russian patent published in 1994 - IPC

FIELD: geological engineering survey. SUBSTANCE: method for ground filtration properties determination includes placing a ground sample in a filtration-and-compression instrument having a piston of a zero weight and an axial force transducer; applying to the sample of hydrostatic pressure in a stepwise manner; measuring water flow rate over specific periods of time; and analysis of obtained data. Additionally are measured the hydrodynamic pressure of filtration flow applied to the sample (for stable filtration conditions) and ground sample displacement force in the working ring (without filtration flow). The obtained data is used to determine the ground filtration resistance ratio from a dependance presented in the description. EFFECT: improved measurement technique. 1 tbl, 2 dwg