2 research outputs found
The Choice of Technology and Equipment for Coal Seamsof Different Bedding Excavation at Kuzbass Surface MinesBased on Digging Capacity and Unit Costs
The paper deals with an approach to the choice of equipment and technological schemes for the extraction of coal seams of different bedding by excavators of high specific productivity. A wide variety of mining and geological conditions for the coal seams bedding in the quarry fields of Kuzbass (Western Siberia, Russia) determines the use of a variety of high-performance excavation (rope and hydraulic shovels, hydraulic backhoes, draglines) and transport (dump trucks, railway trains, draglines) equipment used in various technological schemes. The problem lies in the choice of the excavator type and the technological scheme of its use for extracting coal from seams with different dip angles and thickness within the boundaries of one quarry field in order to achieve maximum productivity and economic efficiency of the entire site development. This article substantiates the analysis of the present and promising coal mining technologies using mechanical shovels, draglines and hydraulic backhoes in order to determine the optimal technological schemes for specific conditions. The basic principle of the proposed idea is to ensure the maximum ratio of the excavator's actual performance and unit costs, taking into account geological conditions and coal loss during extraction. In this regard, based on the analysis, the article presents recommendations for choosing a technological scheme when replacing equipment based on mining and geological conditions. Under certain circumstances, the analysis may result in a recommendation for a complete replacement of the excavator fleet. The advantage of the presented method, along with computational efficiency and visualization, is the applicability for the analysis of technological schemes of any complexity, which makes it possible to use it for the design of sections that develop complex-structured coal deposit
Influence of fracture incidence angle on the local stress state of the near-slope zone of the overburden ledge
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ. ΠΠ°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎ-Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ ΠΏΡΠΈ ΠΎΡΠΊΡΡΡΠΎΠΉ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ ΠΏΠΎΠ»Π΅Π·Π½ΡΡ
ΠΈΡΠΊΠΎΠΏΠ°Π΅ΠΌΡΡ
, ΡΠ°Π²Π½ΠΎ ΠΊΠ°ΠΊ ΠΈ ΠΏΡΠΈ ΡΡΡΠΎΠΈΡΠ΅Π»ΡΡΡΠ²Π΅ Π² Π³ΡΡΠ½ΡΠ°Ρ
Π²ΡΠ΅ΠΌΠΎΠΊ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΡΠ°Π·ΠΌΠ΅ΡΠΎΠ², Π·Π°Π²ΠΈΡΠΈΡ ΠΊΠ°ΠΊ ΠΎΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΠΎΡΠΎΠ΄, ΡΠ°ΠΊ ΠΈ ΠΎΡ ΡΡΡΡΠΊΡΡΡΠ½ΠΎ-ΡΠ΅ΠΊΡΡΡΡΠ½ΡΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄. Π ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ, Π½Π°Π»ΠΈΡΠΈΠ΅ ΡΡΠ΅ΡΠΈΠ½ Π² ΠΏΡΠΈΠΎΡΠΊΠΎΡΠ½ΠΎΠΉ Π·ΠΎΠ½Π΅ ΡΡΡΡΠΏΠ° ΠΌΠΎΠΆΠ΅Ρ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΎΡΠ»Π°Π±ΠΈΡΡ Π΅Π³ΠΎ ΡΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΡ, Π° Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΠΈ ΡΠ³ΠΎΠ» ΠΏΠ°Π΄Π΅Π½ΠΈΡ ΡΡΠ΅ΡΠΈΠ½ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΎΡΠΊΠΎΡΠ° ΡΡΡΡΠΏΠ° ΠΈΠ·ΠΌΠ΅Π½ΡΡΡ ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΡΡ
Π·ΠΎΠ½ Π²Π½ΡΡΡΠΈ ΠΌΠ°ΡΡΠΈΠ²Π° ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΠΆΠ΅Π½ΠΈΡ. ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΠΉ Π½Π°ΡΡΠ½ΠΎ-ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π·Π°Π΄Π°ΡΠ΅ΠΉ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ΅ΡΡΡ Π²ΡΡΠ²Π»Π΅Π½ΠΈΠ΅ Π·ΠΎΠ½ ΠΏΠΎΠ²ΡΡΠ΅Π½Π½ΡΡ
ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ Ρ ΡΠ΅Π»ΡΡ ΠΏΡΠΎΠ³Π½ΠΎΠ·Π° ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΌΠ°ΡΡΠΈΠ²ΠΎΠ² Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌΠΈ ΡΡΡΡΠΊΡΡΡΠ½ΠΎ-ΡΠ΅ΠΊΡΡΡΡΠ½ΡΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ. Π¦Π΅Π»Ρ: Π²ΡΡΠ²Π»Π΅Π½ΠΈΠ΅ Π·ΠΎΠ½ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ Π² ΠΏΡΠΈΠΎΡΠΊΠΎΡΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈ ΡΡΡΡΠΏΠ° Π² ΠΌΠ°ΡΡΠΈΠ²Π΅ Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌΠΈ ΡΡΡΡΠΊΡΡΡΠ½ΠΎ-ΡΠ΅ΠΊΡΡΡΡΠ½ΡΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ ΠΏΡΠΈ Π²Π΅Π΄Π΅Π½ΠΈΠΈ ΠΎΡΠΊΡΡΡΡΡ
Π³ΠΎΡΠ½ΡΡ
ΡΠ°Π±ΠΎΡ. ΠΠ΅ΡΠΎΠ΄Ρ: ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΌΠ°ΡΡΠΈΠ²ΠΎΠ² Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ Ρ ΡΡΡΡΠΎΠΌ ΠΈΡ
ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΈ ΡΡΡΡΠΊΡΡΡΠ½ΠΎ-ΡΠ΅ΠΊΡΡΡΡΠ½ΡΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΊΠΎΠ½Π΅ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ², ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ° ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΡΠΈΠ²Π΅Π΄Π΅Π½ΠΎ ΠΎΠΏΠΈΡΠ°Π½ΠΈΠ΅ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ Π΅ΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΡΠ΅ΡΠΈΠ½ΠΎΠ²Π°ΡΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄, ΠΈΠΌΠ΅ΡΡΠ΅Π³ΠΎ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡ ΠΎΠ±Π½Π°ΠΆΠ΅Π½ΠΈΡ Π² Π²ΠΈΠ΄Π΅ ΡΡΡΡΠΏΠ°, Π° ΡΠ°ΠΊΠΆΠ΅ Π·Π°ΠΊΠΎΠ½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΠΈ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ Π² Π½ΡΠΌ. ΠΠΏΠΈΡΠ°Π½ΠΎ Π½Π°ΠΏΡΡΠΆΡΠ½Π½ΠΎ-Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ Π½Π°Π³ΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΈ Π½Π΅Π½Π°Π³ΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²ΠΎΠ² Π² Π½Π΅Π½Π°ΡΡΡΠ΅Π½Π½ΠΎΠΌ ΠΈ Π½Π°ΡΡΡΠ΅Π½Π½ΠΎΠΌ ΡΡΠ΅ΡΠΈΠ½Π°ΠΌΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΠΎΡΠΈΠ΅Π½ΡΠ°ΡΠΈΠΈ ΡΠΎΡΡΠΎΡΠ½ΠΈΠΈ. ΠΠΏΠΈΡΠ°Π½ΠΎ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅ Π·ΠΎΠ½ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΡΠ°ΡΡΡΠ³ΠΈΠ²Π°ΡΡΠΈΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ, ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΠ΅ ΠΈΡ
Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ Π΄Π»Ρ ΡΡΡΡΠΏΠΎΠ² Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌ ΡΡΡΠΎΠ΅Π½ΠΈΠ΅ΠΌ. ΠΡΡΠ²Π»Π΅Π½Ρ ΠΏΠΎΠ²ΡΡΠ΅Π½Π½ΡΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΡΠ°ΡΡΡΠ³ΠΈΠ²Π°ΡΡΠΈΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ Π² ΠΌΠ°ΡΡΠΈΠ²Π΅ ΠΏΡΠΈ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ ΠΏΠ°Π΄Π΅Π½ΠΈΡ ΡΡΠ΅ΡΠΈΠ½ ΠΎΡ ΠΎΡΠΊΠΎΡΠ° ΡΡΡΡΠΏΠ° ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Π½Π΅Π½Π°ΡΡΡΠ΅Π½Π½ΡΠΌ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ΠΌ ΠΈ ΠΏΡΠΈ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ ΠΏΠ°Π΄Π΅Π½ΠΈΡ ΡΡΠ΅ΡΠΈΠ½ Π² ΡΡΠΎΡΠΎΠ½Ρ ΠΎΡΠΊΠΎΡΠ° ΡΡΡΡΠΏΠ°.Relevance. The stress-strain state of the rock massif during open-pit mining of mineral deposits, as well as during construction in excavations of significant size, depends on both the mechanical properties of rocks and the structural and textural features of the rock massif. In particular, the presence of cracks in the near-slope zone of the ledge can significantly weaken its stability, and the direction and angle of crack incidence relative to the ledge slope change the location of stress zones within the massif relative to the surface of the outcrop. The identification of zones of increased mechanical stresses in order to predict the behavior of rock massifs with different structural-textural properties is an urgent scientific and practical task. The main aim is identification of the stress concentration zones in the near-slope part of the ledge in the rock massif with different structural-textural properties during open-pit mining. Methods: mathematical modeling of rock massifs with regard to their physical and mechanical properties and structural and textural features using the finite element method, processing the results of experimental studies. Results. The paper introduces the description of the mathematical model of the elastic behavior of a natural fractured rock massif with an outcrop surface in the form of a ledge, as well as the laws of stress concentration distribution in it. The stress-strain state of loaded and unloaded massifs in the undisturbed and disturbed by cracks of different orientation states is described, and their values for ledges with different structure are compared. The authors have revealed the increased values of tensile stresses in the massif in the direction of crack incidence from the ledge slope compared to the undisturbed state and in the direction of crack incidence toward the ledge slope