Mohammadi ghaleh aziz,V. , and bahadori,H. . "Presenting a semi-empirical equation for the percentage of active fines parameter (b) to calculate the equivalent intergranular void ratio as a state variable in investigating the behavior of mixed soils", Scientific Quarterly Journal of Iranian Association of Engineering Geology, 18, 2, 2025, 57-69. doi: 10.22034/jiraeg.2026.528274.1347