TY JOUR TI POROSITY COEFFICIENT OF DIFFERENT FRACTIONS OF SANDY SOIL AT DIFFERENT COMPOUNDING DENSITIES KW porosity coefficient KW sandy soil KW grain size JO Modern Technologies and Scientific and Technological Progress AU Obmanko, N.S. AU Knyazik, V.A. AU Baranova, A.A. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»