Project 2
Development of technologies for efficient underground mining of hard-to-recover reserves of seam coal deposits and high-speed mining by robotic modules
"Coal mining and processing"

Introduction of efficient and safe technologies of underground coal mining from thick steep and gentle coal seams, contributing to a significant reduction of technological losses of minerals

  • Technology of high-speed sinking of preparatory underground mine workings by the robotic complex on the basis of hydrofied walking fasteners

  • Technology of aimless development of coal seams of medium thickness by chamber-pillar method by the robotized complex on the basis of the hydroficient walking fastening

  • Technology of mining of reserves of thick flat coal seams with long columns along the strike by robotic complexes with controlled release of underlying strata and de-strengthening of hard-to-collapse roof by the method of directional hydraulic fracturing

  • Technology of mining reserves of thick steep and steeply sloping coal seams with a sub-stage system of development by a robotic complex with release on the basis of a hydroficated walking fastener

  • Technology of alluvial deposits reserves development by robotized complex on the basis of hydrofied walking fastener
    research center of Coal and Coal Chemistry
    SB RAS
    ООО "Kuzbass
    welding center
    and control"
The results of 2022
  • The design of a multifunctional mechanized walking casing (hereinafter referred to as MMPC) consisting of two sections with a cyclic walking method of movement, designed for practical application in various technological tasks of subway development as a multifunctional platform, has been substantiated. It has been established that a two-section construction with time-differentiated walking of sections provides the necessary speed of sinking of preparatory excavations and safety of works during their conduct due to timely advance support of the roof and alternate perception of the overlap of sections of the rock pressure with preservation of the stability of the elements of the structure at the values of the safety factor n>1.5. Theoretically substantiated the dependence of the rock pressure load acting on the MSHK from the side of the roof rock massif on the strength of rocks and roof type on stability. It is established that in the passed preparatory excavation with dimensions 5,0x3,5 m and depth of 250 m the maximum load of 240 kN/m2 of mining pressure from the side of the roof on MMShK occurs on unstable roofs with III type of roof on collapsibility, and the minimum 120 kN/m2 - at stable roofs, thus with increase of a coefficient of strength of rocks for I and III types of a roof on collapse there is an increase of resistance to compression of rocks of a roof in an array and decrease of loading on MMSHK. The design and speed parameters of hydraulic cylinders of hydraulic struts and hydraulic jacks of MMShK moving under the conditions of sinking at maximum load were justified, which allowed to determine the working cycle time of MMShK sections moving 2.15 min and speed 0.93 m/min.
  • Proposals for work on the digital platform for monitoring greenhouse gas emissions at subsequent stages of its development include: justification of the structure and formats of input and output data, as well as exchange files to ensure interaction between program modules; development of the digital platform software; filling the database with reference data on greenhouse gas emission factors of Level 2; test tests of the functioning of individual modules of the digital platform and inter-module interaction.
  • Numerical studies and mathematical modeling of the geotechnical state of the rock mass during the underground excavations with the use of MMShK supports have established, that at the alternate movement of sections of MMSHK with three and two support beams, the deformation module of the section of the support changes and reaches respectively the maximum value of 2013 kN/m2 at a load on the support of 1500 kN, and the minimum of 1920 kN/m2 at a load on the support of 1000 kN, while the maximum value of convergence of the roof and soil of the excavation does not exceed the permissible values and will be 0.168 m. The application of the developed MMSHK in the technologies of sinking of underground mine workings allows to separate consecutive and interrelated operations of the main tunneling cycle in space and partially combine their time, which together increases the rate of sinking not less than 1.8 times.