TY JOUR TI DETERMINATION OF THE FILTRATION COEFFICIENT FOR DIFFERENT FRACTIONS OF SANDY SOIL WITH VARIABLE PRESSURE GRADIENT KW filtration time KW Kamensky tube KW sandy soil KW grain size KW non-stationary filtering mode JO Modern Technologies and Scientific and Technological Progress AU Panov, L.A. AU Baranova, A.A. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»