Journal of Science and Technique – ISSN 1859-0209 107 THE STUDY ON ESTABLISHING THE EXPERIMENTAL DEPENDENCE OF THE COMPRESSED ZONE RADIUS AND THE OBSERVED HEIGHT OF THE SPLASHED FUNNEL IN THE CLAY MEDIUM UNDER WATER Dam Trong Thang 1,* , Vu Tung Lam 1 , To Duc Tho 2 1 Le Quy Don Technical University; 2 Military Science Bureau Abstract Currently, there has not been the general formula calculating the radius of the compressed zone and the observed height of the explosive funnel destroying the ground under water. Therefore, this paper used experiment results from the previous study related to the clay medium under water. This paper studied and established a multivariable regression model, finding the general experiment law relating to the dependence relation between the radius of the compressed zone and the observed height of the splashed funnel in the clay medium under water and the water depth, the depth of buried explosive charge in the clay medium and the radius of explosive charges. The model is built with python programming language version 3. The law of model is evaluated and compared to actual values in experiments through the coefficient of determination R 2 . The result showed that the chosen law reached the relatively high accuracy. Keywords: Blasting; underwater blasting; blasting in clay medium; splashed explosion; compressed explosion; machine learning; regression. 1. Introduction Currently, in the field of blasting works, the general theory system and the calculation of blasting plans have just only resolved explosion missions on land. The calculation system of explosions destroying rock under water has mainly followed the way of inheriting the terrestrial explosion method, there has not been a general calculation method for parameters of the explosion, underwater blasting depends on the water height [1, 2, 4, 12, 13, 15]. Hence, it is an essential studying direction for studying the experiment law of the dependence between a side which includes the radius of the compressed zone and the observed height of the splashed funnel, and another side which includes the depth of buried explosives, the water depth and the radius of explosive charges. This studying direction also contains scientific and practical meanings. Establishing experiment laws on relations among parameters at multidimensional and multivariable level found it hard to give a general, successive form from splashed explosions to smoldered explosions with the traditional regression method [2]. * Email: thangdt@lqdtu.edu.vn https://doi.org/10.56651/lqdtu.jst.v3.n02.157.sce