Study on Efficient Utilization Technology of Coal Pillar Based on Gob-Side Entry Driving in a Coal Mine with Great Depth and High Production

Abstract

Improving the utilization of non-renewable resources takes a crucial position in circular economy. Gob-side entry driving technology has been widely applied in coal mines in China, such as in the Shilawusu mine (Ordos City, Inner Mongolia), here considered as a case study due to its high safety and resource-recovery rate. However, at present the complexity of coal pillar utilization makes it hard to fully master the key technology for coal pillar size design, which leads to huge waste of coal resources. Based on theoretical calculation and numerical simulation, this study analyzed the basic mechanical structure of coal pillar and the characteristics of its weakening failure, providing theoretical reference for efficient recovery of coal resources. In general, results of this study can be helpful in pursuing the efficient, hence sustainable, development of mines with Gob-side entry driving technology.

Determination of coal pillar width for gob‐side entry driving in isolated coal face and its control in deep soft‐broken coal seam: A case study

“…Therefore, it is of great guiding significance for safe and efficient production of coal mine by analyzing the stress distribution and plastic characteristics of surrounding rock, and reasonably designing narrow coal pillar width and control technology. 6,7 In view of GED technology, scholars have mainly carried out the following research: (1) main advantages: in the low-stress zone, 8 improving the utilization rate of coal resources, 9,10 accelerating the excavating rate 11 ; (2) in terms of large deformation and failure mechanism of surrounding rock: a theoretical mechanical model of surrounding rock structure, 12,13 influence characteristics of basic roof thickness on surrounding rock stability, 14 disturbance mechanism of basic roof subsidence on narrow coal pillar, [15][16][17] failure mechanism of deep topcoal caving face, 18 distribution and evolution laws of surrounding rock displacement and stress 19,20 were studied; (3) narrow coal pillar width [21][22][23] and its control technology 24,25 were determined under specific conditions.…”

Mining‐induced failure characteristics and surrounding rock control of gob‐side entry driving adjacent to filling working face in the deep coal mine

“…Xue et al 10 established a mathematical model of a coal pillar from the perspective of energy accumulation and dissipation and analyzed the energy balance relationship of a coal pillar mechanical system. Li et al 11 analyzed the basic mechanical structure of a coal pillar and its weakening failure characteristics using a theoretical calculation and numerical simulation. Zhang et al 12 analyzed the lateral support stress distribution law near the gob side and investigated the relationships between the coal pillar stress distribution, roadway surrounding rock stress distribution, roadway surrounding rock deformation, and coal pillar width.…”

The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining

“…Coal is one of the main energy sources in China [2][3][4]. Therefore, the development of high-yield, high-efficiency, and safe mining technology for thick continuous coal seams is important to ensure the high production of coal [5]. However, the rapid development of mining technology in the coal industry results in an increase in the depth and intensity of mine mining.…”