JUSTIFICATION OF REGULATIONS FOR DRIVING PARALLEL MUTUALLY INFLUENCING MINE WORKINGS IN STRESSED CRACKED ROCKY MASSIFS

• Main Authors: Timur F. Kharisov, Aleksandr E. Balek, Ivan L. Ozornin
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2020-10-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: massif; in situ research; stress-strain state; structural structure; hierarchical block structure
• Online Access: http://izvestiya.tpu.ru/archive/article/view/2851/2325

The relevance of the research is caused by the necessity to account mutual influence of the mine workings constructed in the intense cracked massifs of rocks for preserving stability of the approached mine workings in the course of their building and operation. The aim of study is to estimate the size of the deformation zone formed around a single horizontal mine workings during its construction with subsequent justification of the types and parameters of support, ensuring their stability. On the basis of the results of experimental and analytical studies of the «fastener–massif» system deformation, which were obtained and accumulated over 50 years in the course of construction of workings in the massif of chromite deposits of the Don Mining and Processing Complex, the assessment of stress-strain state of the rock massif on the scale of the mine field was made and the geomechanical model of the massif, which is characterized by gradual brittle destruction of rocks and subsequent crossovers, was justified. Results. The radii of deformation zones of the massif formed in different conditions around capital excavations for the whole range of design depths of the investigated field have been determined by the calculated method. The interval of optimum values of the repulse and, accordingly, bearing capacity of the support, providing reduction of radiuses of deformation zones around the horizontal extended and large-volume excavations of crushing and bypass complexes, was determined. Technological regulations for driving and fastening of such workings are developed, which take into account the processes of rock deformation that occur around each workings. Justification of types (special profile of CVP 17÷27) and parameters of attachment of parallel mutually influencing workings under conditions of the massif under study, providing the required repulse and stability of the close workings, both in the process of driving and subsequent operation, was made. Testing and practical implementation of the obtained technological solutions is currently being carried out in the process of construction of near-barrelled yards of the new stage of the mine DNK of the Donsk Mining and Processing Integrated Works.