The design procedure parameters of system of pillars of when developing coal-bed dangerous on rockburst. Recommendations about a choice of parameters of pillars are provided for example the preparation of protective seams Fifth and Fourth on JSC «Vorkutaugol» mines.
Positions of methodology of a complex estimation of influence of tectonic disturbances on stability of a rock mass for conditions of mining of ore deposits of a difficult geologic structure are considered. Degree of stability of a rock mass and constructive elements of mining methods in zones of influence of tectonic disturbances is estimated on size of an increment of stresses from action of motions on a contact surface of a tectonic disturbance.
Results of the analysis of factors of mining operations influencing safe conducting are resulted. Technological solutions on the pressure control, allowing messages mining operations on the big depths in rock-bump hazardous conditions are considered. Methodical positions and results of definition of parameters of constructive elements of systems of minings for conditions North Ural bauxite deposits are resulted.
The modern industrial corporations are deeply integrated which is expressed in a variety of connections and interactions. Key among these are technological connections based on which the commodity and cash flows are generated. The global innovative economy impacts economic activity integration and consolidation parameters, leading to organization of strategic management and value creation chains in mesoeconomic network structures with a single logistic center, intangible assets and a special system of long-term contracts. Product fabrication in the mineral resources sector is primarily associated with the large highly efficient companies. Meanwhile present competition in the global resource extraction and a need in further development and growth of the companies, especially in the resource-based economies, become a stimulus for implementation of large-scale strategic projects involving exploration of new mineral resources. As a rule, strategic projects in mineral sector have impact on the population and various business actors, on the development of an industry, a region and a country as a whole. Strategic investment projects in the mining sector are often implemented in complicated organizational, technical and economic setting, including poor infrastructure, harsh natural climatic and geographical conditions, lack of qualified staff, a need in large-scale funding, a need to mitigate material adverse effect on the environment. Large-scale projects implemented in the frontier regions have significant impact on the development of resource- based economies and cross-border cooperation. Selection of a modality for implementation of the mining project and assessment of its effects can be based on the added value concept, which maximizes the value growth. Value creation pattern depends on a number of production stages, depth of diversification, production capacity, company assets and range of products. Here it is important to consider not only project’s positive NPV, but also emerging additional effects related to project integration and implementation in the value chain. The purpose of the study is to justify a methodic approach based on the value chain to the assessment of effects of a large-scale mining project, which may have impact on a holding, a region, national economy and cross- border cooperation. The research carried out helped to justify the use of the added value concept for deciding on the type of pro ject for the field development, the basic and additional effects of a large-scale mining project have been revealed and possible organizational and economic framework for creation of tin industry in the Republic of Kazakhstan has been proposed.
The safe parameters of temporary interchamber pillars have been determined for the chamber-and-pillar method with ore discharge on trenches in designing of underground mining of the Koashva apatite-nepheline deposit. The results of calculation of economical efficiency of comparable parameters are presented. It was substantiated that the economical efficiency of application of the chamber-and-pillar method up to the depth of 800 m is related to the increase of natural yielding of interchamber pillars.
Comparison of results of calculations of the tangential stresses on the inner contour of tunnel lining and radial stresses on the outer contour is done. Stresses are found by solving the problem of interaction in geomechanical system «lining-ground massif» in 2D and 3D model (single layer tunnel lining and double layer tunnel lining). Area of correct application of 2D models are revealed.
The article describes practical experience of using room and pillar mining (RAPM) under conditions of deep horizons and dynamic overburden pressure. It was identified that methods of rock pressure control efficient at high horizons do not meet safety requirements when working at existing depths, that is explained by changes in geodynamic processes during mining. With deeper depth, the geodynamic processes become more intensive and number of pillar and roof failures increase. When working at 800 m the breakage of mine structures became massive and unpredictable, which paused a question of development and implementation of tools for compliance assessment of used elements of RAPM and mining, geological, technical and geodynamic conditions of North Ural bauxite deposits and further development of guidelines for safe mining under conditions of deep horizons and dynamic rock pressure. It describes reasons of mine structure failures in workings depending on natural and man-caused factors, determines possible hazards and objects of geomechanic support. It also includes compliance assessment of tools used for calculations of RAPM structures, forecast and measures for rock tectonic bursts at mines of OAO “Sevuralboksitruda” (SUBR). It describes modernization and development of new geomechanic support of RAPM considering natural and technogenic hazards. The article presents results of experimental testing of new parameters of RAPM construction elements of SUBR mines. It has data on industrial implementation of developed regulatory and guideline documents at these mines for identification of valid parameters of RAPM elements at deep depths.
The paper presents results of conducted research using regional and local methods of forecast and control over geomechanical state of the rock mass at burst-hazardous Nikolayevskoye field, located in a geodynamically active region. The study subject is the ore mass of Nikolayevskoye field, characterized by man-induced and tectonic disturbances and high geodynamic activity. The aim of research was practical implementation of methods and instruments of forecast and control over geomechanical state of the burst-hazardous rock mass and safety improvement of mining operations. Exploitation practice of burst-hazardous fields demonstrates that forecast accuracy of hazardous rock pressure demands cutting-edge multi-level systems, where local methods and tools complement regional ones. A regional forecast of rock-burst hazard at Nikolayevskoye field was performed by means of seismoacoustic method using automated control system for rock pressure (ACSRP) «Prognoz-АDS». Local forecast was carried out using «Prognoz-L» device, geophysical (sample disking) method and visual observations of dynamic pressure manifestations in the mining tunnels. Quality assessment of stress-strain and burst state of the rock mass was performed using specialized software «PRESS 3D URAL». Integration of engineering and geomechanical data in the process of conducting research guarantees a relevant assessment of rock-burst hazard in various areas of the field at various stages of its development. Practical verification of the system, where local methods and tools complement regional ones, demonstrated satisfactory results at Nikolayevskoye mining plant, which makes it recommendable for other mining facilities extracting ore at great depths under similar conditions of active geodynamic processes.