Comparative Analysis of Basic and Extended Power Models of Boreholes Expansion Dependence on Explosive Charge in Blasting in Clay Soil

Abstract

Spherical cavities made by explosive charge activation in a clay soils differ in size and shape. The mass of explosive charge lowered on the bottom of the borehole in a one-time blasting is typically relatively small and is calculated by a desired and planned performace. The effect of smaller explosive charge for spherical cavities is in principle different than continuously filled borehole in mining and blasting operations. Detonation of smaller explosive charge crushes the material in proximity of activated explosive charge. With the increase of distance from the explosive charge, the released energy in not enough for crushing of the materials, but instead compacts it. This paper is an extension of the previous research, which resulted in a smallest error of estimated in a model shown as the sum of square residuals (SS), largest value of determination coefficient (R2) and smallest loss of information through Akaike’s Information Criteria (AIC and AICc). This paper presents an extended power model of dependence of spherical cavity volume expansion on explosive charge. Extended model is a basic model with an additional parameter to ensure more precise mathematical description and further decrease of error of estimate for all efficiency indicators and for both types of explosive used.

Influence of Meteorological Parameters on Explosive Charge and Stemming Length Predictions in Clay Soil during Blasting Using Artificial Neural Networks

“…Further, the compatibility of the application with other CAD tools greatly contributes to the verification and more detailed 3D model of the resulting expansion. Regarding the need to use the data processing method for the obtained data, Volume of the resulting cavity, V rc [m 3 ], Resulting expansion of the borehole, L re [m], and Deepening of the resulting expansion, D re [m], during the preparation of the doctoral dissertation, Težak, D. 2018 [2] confirms and additionally proves this by introducing an additional supplemented model [2,6]. The introduction of a supplemented model in defining the resulting volume of spherical expansion, expansion and deepening of a borehole improved the original method presented in Težak, D. 2018 [2], and further facilitated the use of the application "Bušotine" when blasting in clays in geotechnical practice.…”