RESEARCH OF ARRAY GEODYNAMICS IN THE INTERFACE OF CLEANING AND PREPARATORY WORKS

Abstract

Relevance. At underground mining of rocky metal deposits in the junction zone of treatment and preparatory workings, the dynamics of stresses and strains complicates ore mining and reduces production efficiency. At the site of conjugation of workings, deformations in rocks serve as a source of local collapses. The study of the mechanism of development of stresses and deformations in the zone of ore body opening by mine workings allows adjusting the parameters of the cleaning works, reducing the results of the negative manifestation of rock pressure. The main methods of predicting the rate of development of rock pressure are field studies using geophysical and surveying methods. The obtained values ​​of stresses and strains are the basis for an objective assessment of the state of the array in the junction area of ​​the workings. Results. According to the field studies, the authors have constructed the graphs of changes in the support lining in time and space around the mine and assessed the mechanism of rock pressure development under the influence of mining. It is determined that the array is characterized by three sections of the existing stresses. The authors established a slight increase in stresses during the first three months of refining, as well as a slower rate of increase of stresses in rock than in ore. It is revealed that ore extraction in the junction zone of workings is divided into three phases according to the nature of development of deformations, which obey the laws. Findings. The established patterns of tension development in the zone of weakening by an array make it possible to predict the array state with details sufficient for controlling, that allows adjusting the development parameters to obtain the economic effect by reducing the dilution of ores and reducing the risk to workers.

Keywords

• ore
• development
• stress
• strain
• strain gauging
• leveling
• quality
• safety