The experimental and practical results of applying backfill

Palarski, Jan

doi:10.1201/9781003211488-5

Cited by 9 publications

(4 citation statements)

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“…In 1986, Polish scholar J.Palarski proposed that the surface subsidence should be controlled by the method of off-layer grouting, and predicted that off-layer grouting could reduce the amount of surface subsidence by 20-30% [7]; in 1990, Russian scholar В.Л.Самарин focused on the formation of off-layer zones, the location of the development of the zones and their influencing factors by taking the mining under the water as the object of his research; and S. Lin analyzed the dislocation of the composite roof level. S.LIN analyzed the discontinuity of displacement and the change of stress at the composite roof level [8]; Gregory Molinda observed the composite roof plate delamination in the field and proposed the method of grouting to strengthen the roof plate [9]. Gregory Molinda proposed the method of grouting to strengthen the roof slab [10].…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism and Prevention Technology of Mine Water Disaster under Complex Conditions

Ren,

Shi

2024

E3S Web Conf.

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With the continuous westward shift of China’s coal production center, the western mining areas will play an increasingly important role in ensuring national energy security. It is urgent to extract coal economically and efficiently and realize scientific mining under the premise of ensuring the safe and environmental capacity. This paper systematically summarizes the research progress of coal seam separation water disaster at home and abroad, and elaborates the problem of coal seam separation water disaster from four aspects: formation mechanism of coal seam separation water, disaster-causing mechanism, prediction and early warning of water disaster and key prevention and control technologies. This paper summarizes the research on mining overlying strata separation and the formation mechanism of overlying strata separation water, and summarizes the formation of coal seam overlying strata separation water into three basic conditions: water separation, the existence of recharge water around the separation bed, and the separation space lasting long enough. However, the prevention and control of coal mine water disaster under complex geological conditions is an important problem restricting coal mine safety at present. The water damage prediction of overlying strata separation is summarized from three aspects: prediction of the location of available water separation, prediction of the periodicity of water inrush and prediction of the amount of water inrush, according to the development characteristics of bed separation. In this paper, the water damage prediction of overlying strata separation is summarized from three aspects: prediction of the location of available water separation, prediction of the periodicity of water inrush and prediction of the amount of water inrush. According to the development characteristics of bed-separation and the location of bed-separation water, the main prevention and control methods of bed-separation water damage, such as diversion hole, advance drain hole and ground direct pump hole, are proposed.

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Section: Introductionmentioning

confidence: 99%

Formation Mechanism and Prevention Technology of Mine Water Disaster under Complex Conditions

Ren,

Shi

2024

E3S Web Conf.

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“…These often have unclear warning signs of water inrush, are of short duration, are difficult to detect, and have the typical characteristics of bed separation water damage [7]. There have been several studies of the formation mechanism and evolution pattern of bed separation in relation to coal seam mining [8][9][10][11]. For example, Qiao [12][13][14] suggested that there are three basic conditions for the formation of bed separation water: space that can accumulate water; the existence of recharge water sources around the strata; and the duration of the space within the strata being long enough to accumulate water.…”

Section: Introductionmentioning

confidence: 99%

Bed Separation Formation Mechanism and Water Inrush Evaluation in Coal Seam Mining under a Karst Cave Landform

Gao,

Xu,

et al. 2023

Processes

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Understanding the formation mechanism of bed separation in coal seam mining under a karst landform is needed for the prevention and control of roof-separated water damage in such areas. This research used a mine in the northern Guizhou coalfield, China, as a case study, and applied theoretical analysis, numerical simulation, and on-site measurement to develop a circular cave structure model in a key stratum. The dynamic evolution of a separation bed was analyzed from several aspects, including the formation mechanism, development location, the mechanical condition of local karst caves, fracture evolution, and fractal rules. Verification using in situ measurements is presented for the case study mine, and a quantitative evaluation method for water inrush from bed separation and improved fusion weighting is proposed based on a cloud model. The research results indicate the following: (1) Tensile cracks are prone to occur above and below a karst cave, which produce an impact of connectivity on the separated space. (2) When the working face advances to 270 m in coal mining, longitudinal tensile cracks below the karst cave gradually increase and the width of the bed separation crack shrinks to 68.2 m, with a maximum separation layer height of 3.01 m. (3) Based on the cloud model and the improved weighted fusion method, the risk of water inrush in bed separation is judged as “high”. The En of the cloud digital features is 0.0622 and the He is 0.0307, achieving a quantitative evaluation of water inrush in the separation layer that is consistent with on-site practice, and is highly stable and reliable. This study improves the understanding of the development pattern of bed separation and water inrush risk assessment in coal seam mining under a karst cave landform.

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“…Soviet scientists initially introduced grouting as a means to mitigate sinking. Subsequently, experiments of this technique were conducted in Poland during the 1980s [17]. Research on this technology in Australia was initiated in 2000 [18,19].…”

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confidence: 99%

Quantitative Evaluation of Isolated Overburden Grout Injection Technology Based on Large-Deflection Inclined Thin Plate Combined with Slurry Modeling

LI,

YANG

2024

Preprint

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In the Quaternary thick loose layer covered mining area, the Isolated Overburden Grout Injection technology has been widely applied and has provided effective ground subsidence management. For the process of mechanical action on the important strata, the stresses generated externally by the slurry in the Bed-separation cavities remain a study open question. In this paper, a large deflection mechanical model of inclined principal key strata (PKS) thin plate under the action of bed-separation slurry is constructed based on the large deflection of thin plate, the principle of energy law, fracture mechanics, and non-Newtonian hydrodynamic theory. The 7221 work face mining in Anhui Province, China, the height of the caved zone, fractured zone, continuous bending zone, and the placement of each important strata are all inferred by the model using the drilling holes’ physical and mechanical parameters. Assuming 7221 work face Longwall mining, the maximum deflection and volume of PKS are calculated and verified with 3DEC numerical simulation. Based on iso-volume, calculate the ground-moving basin inscribed function. The factors related to the grouting hole are analyzed, specifically focusing on the deflection and ground subsidence engraving function of the PKS in Isolated Overburden Grout Injection mining. The accuracy of PKS deflection after grouting was verified using 3DEC. The Small Baseline Subset (SBAS) technique was also employed to interpret satellite pictures from Sentinel I-A for ground subsidence monitoring. Model calculations, SBAS monitoring results, and measurements were cross-validated. This paper aims to quantitatively analyze deflection values, deflection volumes, and maximum ground subsidence for the PKS under two mining methods: Longwall mining and the Isolated Overburden Grout Injection technology. Applying the technology in the mining field involves deducing the mechanical mechanism and thoroughly verifying the actual subsidence and reduction impact.

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The experimental and practical results of applying backfill

Cited by 9 publications

References 0 publications

Formation Mechanism and Prevention Technology of Mine Water Disaster under Complex Conditions

Formation Mechanism and Prevention Technology of Mine Water Disaster under Complex Conditions

Bed Separation Formation Mechanism and Water Inrush Evaluation in Coal Seam Mining under a Karst Cave Landform

Quantitative Evaluation of Isolated Overburden Grout Injection Technology Based on Large-Deflection Inclined Thin Plate Combined with Slurry Modeling

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