Improving the efficiency of methane extraction from coal seams

This article discusses the issues of ensuring the safe conduct of mining operations in coal mines. Ensuring the safety of coal industry workers is an urgent problem today. The gas content of the layers increases with the depth of their occurrence and is a deterrent factor in the extraction of minerals. Sudden methane emissions can provoke a large number of human casualties, financial losses, and other consequences. In recent years alone, such accidents have claimed more than 157 human lives in the mines of the Karaganda coal basin. However, by solving this important problem, you can get associated gas. It is not easy to reduce the gas content using existing degassing technologies. The formations have almost zero gas permeability and low gas output at the current depths of their development. That is why it is necessary to have an impact on the coal seam as early as possible in order to ensure the release of methane. This process will make it possible to obtain associated gas, which can be used for the needs of industry or the national economy. As a result, reducing the gas content of coal seams will reduce the risks of mining operations and increase labor safety.

Section: Introductionmentioning

confidence: 95%

unclassified

Experience of coalbed methane extraction in the Karaganda coal basin

Rabatuly,

Musin,

Zamaliyev

et al. 2023

“…The research of the method justifying the application of a limitedly yieldable anchor support, which influences the development of fracture zones in the contour rocks by binding and hardening them within the initial zones of stratification, formed outside the zone of influence of coal-face works, to create a safety bridge, distributing pressure on the vault heels, and playing in the subsequent in the zone of supporting pressure, the role of redistributing the load from the overlying rocks that have come into shear -figure 1 is established [ [7], [8]].…”

Section: Introductionmentioning

confidence: 99%

Technological conditions for ensuring the stability of the array of enclosing rocks during the fastening of mine workings

Khalikova,

Demin,

Demina

et al. 2023

Ensuring the stability of the array of enclosing rocks during the fastening of mine workings is possible only if there is a highly efficient technology for conducting and maintaining workings. For fixing the mining, taking into account the technological stratification of coal-bearing massifs, a method using anchor fastening technology is recommended. The effect of the proposed method of fastening workings is that high reliability of fastening is ensured, and the volume of labor-intensive processes to combat the collapse and stratification of rocks is reduced. The stability of the contours of preparatory workings, taking into account their stress-strain state, depending on mining, geological, and technological factors of factors using the finite element method, is investigated. The boundaries of the area of inelastic deformations are determined by the method of successive loadings. The parameters of deformation of the lateral rocks of the mine workings from the angle of incidence of the formation and the depth of anchoring are considered.

“…To increase the efficiency of rock mass support around the excavation for its strengthening, a purposeful geotechnological impact on the stressed and deformed zones with active manifestations of pressure around mine workings on the basis of the results of production monitoring and modeling of the "wall rock mass -contour support" system is necessary [ [7], [8]].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of the stress-strain state during preparatory workings

Khalikova,

Diomin,

Mussin

et al. 2023

Maintaining and increasing the volume of underground coal mining is possible only if there is a highly efficient technology for conducting and maintaining preparatory workings. The purpose of the research was to assess the parameters of stability control of the contours of the mine workings, anchored with anchorage, to create a technology for intensive and safe excavation of mine workings based on the identified patterns of behavior of adjacent rock massifs. The idea of the approach is to use a man-made stress-strain state to develop an effective technology for fixing a contour rock mass. The mechanism of deformation, displacement, and collapse of rocks in a structurally disturbed inhomogeneous mountain range is investigated to assess the state of the rock mass around the mine workings. The technology of fastening contiguous soil rocks has been developed taking into account the state of the mountain massif around the workings and the parameters of the operation of the anchor supports in mines for fixing rods in workings in order to ensure the safety of mining operations in the mines of the Karaganda coal basin have been determined.