Kinematic Characteristics of Movement of the Explosive Cavity Wall in Different Rocks

摘要

Based on examination of the first stage of the explosive explosion in the rock massif an expression was proposed for increasing mass of rocks,squeezed out of the explosive cavity.Using the theorem of momentum change of the body with variable mass the dependence was determined of velocity changing of the explosive cavity walls movement from its radius.Giving a certain value of relative movement of the cavity walls,one can easily calculate their velocity during corresponding period according to this dependence.Also this dependence allows to find the expansion time of the explosive cavity during the period between its adjacent positions.According to the proposed formulas the velocities and expansion time were defined of the explosive cavity in rocks with different physical and mechanical properties by using explosives with the different physical-chemical characteristics.