Authors: Yu.A. Masaev, V.Y. Masaev, A.P. Politov

Title of the article: The impact of drilling and blasting operations on the disturbance of the legal array of mine workings

Year: 2023, Issue: 4, Pages: 75-83

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.236.4:622.235

DOI: 10.26730/1999-4125-2023-4-75-83

Abstract: Excavations are carried out over undisturbed rock masses, the strength properties of which vary depending on the depth of occurrence, formation conditions, stress state and other conditions. Depending on the conditions of their formation, the underlying rocks have natural fracturing, and during excavation, especially by drilling and blasting, the rock massif is disturbed and additional fractures are formed, which differ significantly from the natural fracturing. And the actual disturbance of the massif, obtained after explosive works, should be considered as the total fracturing. For many years, studies of rock fracturing in relation to solving a variety of problems, the main ways of studying these problems are geological, physical, strength, production, modeling. When carrying out mine workings by drilling and blasting method, only obtaining of a smooth contour of the workings that complies with the design cross-section is taken into account, and the factor of disturbance of the contour massif by formation of an additional system of cracks is not taken into account. To determine the influence of the contour blasting parameters on the disturbance of the massif, experimental research was carried out under production conditions. It included: continuous sounding by commercially available ultrasound equipment; direct observations of cores drilled in the faces and roofs of workings at different depths; analysis of fracturing and energy intensity of rock samples fracture.

Key words: legal array strength properties ultrasonic sounding cores cracking

Receiving date: 15.06.2023

Approval date: 15.09.2023

Publication date: 27.09.2023

CITE DOWNLOAD