Asymmetric deformation mechanism and control technology of roadway under room-pillar group in Huasheng coal mine

Liu, Hai-yan; Zuo, Jian-ping; Zhang, Chun-wang; Wu, Kai-jun; Lei, Bo

doi:10.1007/s11771-023-5364-y

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…The occurrence of multiple coal seams is a distinctive feature in coal deposits, and the extraction of multiple coal seams poses a common challenge in coal mining. Regarding the sequence of mining in multiple coal seams [1,2], the traditional approach primarily involves downward mining [3,4]. The opposite mining sequence is upward mining [5].…”

Section: Introductionmentioning

confidence: 99%

Calculation Method of Support Load Zoning and Mechanism of Mine Pressure Behavior in Upward Mining Face across Half of the Goaf along the Panel Direction

Zhang,

Ma,

Feng

et al. 2024

Processes

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The 1515 mining face in Yongming Coal Mine was upward mined across half of the goaf along the panel direction. In this paper, the methods of field measurement, theoretical analysis, and numerical simulation were used to study the overlying rock fracture structure, support load characteristics, and the mechanism of mine pressure behavior across half of the goaf. The results indicate that the support load of the 1515 upward mining face across half of the goaf along the panel direction exhibits distinct zoning characteristics. The maximum support load is 1.37 times the minimum support load. The development height of the roof separation in the up-mining area is 1.74 times that in the entity coal area, at 9.1 m and 5.22 m respectively. The height of separation and hanging roof length increase and decrease, respectively, along the initial rock fracture area, tensile fracture area, structural fracture area, and compacted fracture area. Based on the definition of the variation coefficient “m” for immediate roof height and hanging roof coefficient “n”, a partitioned method for calculating support loads in the upward mining face across half of the goaf was proposed. Finally, the key parameter values for support loads in each zoning were provided and validated.

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Section: Introductionmentioning

confidence: 99%

Calculation Method of Support Load Zoning and Mechanism of Mine Pressure Behavior in Upward Mining Face across Half of the Goaf along the Panel Direction

Zhang,

Ma,

Feng

et al. 2024

Processes

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Numerical Model for Fracture Instability Mechanism and Reinforcement Technology of Irregular Coal Pillar Under the Mining Abutment Stress: A Case Study from Da-yang Coal Mine

Shen,

Chen,

Wang

et al. 2024

Mining, Metallurgy & Exploration

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A new indicator for estimating the degree of mining-induced land subsidence: the overburden’s average GSI value

Gong,

Zha,

Guo

et al. 2024

Sci Rep

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Underground coal mining leads to land subsidence, which, in turn, results in damage to buildings and infrastructure, disturbs the original ecological environment, and hinders the sustainable development of coal mining cities. A reasonable estimation of land subsidence, on the other hand, is the foundation for building protection, land reclamation, and ecological environment reconstruction. However, when we applied the existing land subsidence estimation theory to the deep mining areas of the Ordos coalfield in western China, there was a significant deviation between the estimations and the measurements. To explain such unusual case, we propose using the overburden’s average GSI (Geological Strength Index) value instead of the compressive strength (UCS) of rock specimens for a better representation of the overburden’s overall properties. By using on-site subsidence monitoring results and historical data, we provided evidence which supports that the overburden’s average GSI value has a much greater impact on subsidence rates than the UCS. Subsequently, we investigated the relationship between three typical overburden’s GSI values and the subsidence rates via a calibrated numerical model, revealing the variation patterns of maximum surface subsidence when the overburden’s average GSI value is set at 30, 50, and 75, respectively. Finally, on the basis of the measured and simulated results, we discussed a non-conventional strip mining method for mining subsidence control in the deep mining areas of the Ordos coalfield in western China, and explained why it is possible and what are the significant advantages behind. The proposed methods, findings, and suggestions in this paper are therefore quite helpful for researchers and engineers who wish to estimate and control the mining-induced land subsidence, as well as for those who are particularly interested in the study of environment science related to land subsidence.

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Asymmetric deformation mechanism and control technology of roadway under room-pillar group in Huasheng coal mine

Cited by 5 publications

References 37 publications

Calculation Method of Support Load Zoning and Mechanism of Mine Pressure Behavior in Upward Mining Face across Half of the Goaf along the Panel Direction

Calculation Method of Support Load Zoning and Mechanism of Mine Pressure Behavior in Upward Mining Face across Half of the Goaf along the Panel Direction

Numerical Model for Fracture Instability Mechanism and Reinforcement Technology of Irregular Coal Pillar Under the Mining Abutment Stress: A Case Study from Da-yang Coal Mine

A new indicator for estimating the degree of mining-induced land subsidence: the overburden’s average GSI value

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