Study on surface subsidence prediction method of shallow coal seam backfill-strip mining under the hard roof

Bo, Huaizhi; Guo, Guangli; Li, Huaizhan; Wang, Yuezong; Jiang, Qian; Hu, Shanchao; Zhang, Fanglong

doi:10.1007/s10064-023-03284-3

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…However, the overlying rock structure in LHAs has not been studied in depth. With the continuous increase of mining intensity, the coal seams of Jurassic Yan'an Formation are mostly spontaneous combustion and spontaneous combustion coal seams, which are shallowly buried close distance [18,[30][31][32]. There is no bending subsidence zone in this area, and the overburden fractures develop to the surface [1,14].…”

Section: Introductionmentioning

confidence: 96%

Study on the mechanism and control of strong ground pressure in the mining of shallow buried close-distance coal seam passing through the loess hilly region

He,

Huang,

2024

Preprint

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Shallow buried close-distance coal seam (SBCCS) is widely found in northern Shaanxi, China. In the process of mining under the loess hilly area (LHA) in SBCCS, many accidents of strong ground pressure have occurred. Taking the in the Zhangjiamao Coal Mine as the background, this study revealed the mechanism of high ground pressure when the working face of lower coal seam passes through the surface loess hilly region. On-site measurements, physical similarity simulation, numerical calculation, and theoretical analysis were combined to study the mining process of SBCCS. The movement characteristics of the activated structure of the interval strata of the lower coal seam were analyzed. The dynamic load and the change pattern of the front abutment pressure (FAP) of the support during the loading stage of entering and exiting the loess hilly were determined. A coupled structural mechanics model of the overlying activated voussoir beam and the step voussoir beam rock beam of the interval strata was established, revealing the dynamic loading mechanism of strong ground pressure during passing through the LHA . The results showed that the dynamic load of the working face was the highest in areas affected by the load of the LHA, followed by the load while entering the LHA , the peak value of the FAP in the load-influenced LHA was high, which was approximately 1.12 times that after leaving the load-influenced LHA and 1.61 times that before entering this area. By establishing a mechanical model of the roof coupling structure when entering and exiting the load-influenced LHA, it was revealed that the dynamic load of the support while mining under the goaf in the LHA is mainly due to the synchronous movement of the activated structure of the collapsed roof of the upper coal seam and the interval rock structure. The load in the LHA was transmitted to the interval rock structure through the activated structure, resulting in a high dynamic load on the support. The study concluded that the determination of the support resistance of the working face should be based on the high-period compressive load of the synchronous movement of the roof structure in the loess hilly beam area. Through the engineering practice of hydraulic fracturing, the roof structure of the interval strata is changed, which can effectively reduce the dynamic pressure disaster of the working face. The research provides a scientific basis for the safe and efficient mining of shallow coalfields, and it provides reference for similar mining.

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Section: Introductionmentioning

confidence: 96%

Study on the mechanism and control of strong ground pressure in the mining of shallow buried close-distance coal seam passing through the loess hilly region

He,

Huang,

2024

Preprint

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“…The extraction area lling mining mostly involves the deposition of waste materials within the designated extraction area after the extraction of coal seams. The classi cation of lling materials is based on their state, which includes water-sand lling [7],…”

Section: Introductionmentioning

confidence: 99%

“…solid lling [5,7], paste lling [8,9], and slurry lling [10]. Bed-separation lling mining refers to introducing ller material into a cavity, primarily via the Isolated Overburden Grout Injection Technology.…”

Section: Introductionmentioning

confidence: 99%

Isolated Overburden Grout Injection Technology Mining and Grouting Parameters Discussion and Redesign

LI,

MA,

YANG

et al. 2023

Preprint

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The "Three down" coal resource mining, ground subsidence management, and fly ash waste treatment are carried out using the Isolated Overburden Grout Injection Technology, which embodies the idea of green mining. The concurrent mining and grouting of bed-separation voids beneath key strata are intricately intertwined and subject to space and time constraints. Isolated Overburden Grout Injection Technology may be successfully analyzed using the large-deflection inclined thin plate mixed with the slurry model. Nevertheless, the diversity in stratigraphic parameters, including main roof and principal key strata (PKS), across various mines, as well as variations in design parameters such as working face dimensions, mining height, coal seam angle of inclination, mining speed, and grouting parameters like the number of grouting holes, start and finish times, and slurry consistency, ultimately contribute to discrepancies in outcomes such as PKS deflection and Bed-separation development, as well as the maximum subsidence and extent of the ground subsidence basin. To ensure the precise and efficient protection of village structures, the extraction of coal resources, and the proper disposal of fly ash waste, it is imperative to conduct a comprehensive analysis of the impact of each parameter of the model. This analysis will help elucidate the mining and grouting process and facilitate the rational design of the relevant parameters. This paper categorizes and discusses the impact of each parameter on the outcomes, using the case study of the 7221 work face grouting operations in Huaibei, Anhui Province, China. In order to fulfill the protection needs of the Gaochangying and Houlou Gaojia villages, modifications were made to the mining and grouting sections' parameters. These modifications evaluated the potential benefits of increasing the original design of coal seam resources and implementing fly ash backfill.

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Isolated overburden grout injection technology mining and grouting parameters discussion and optimization

Li,

Ma,

Yang

et al. 2024

Environ Earth Sci

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Study on surface subsidence prediction method of shallow coal seam backfill-strip mining under the hard roof

Cited by 3 publications

References 36 publications

Study on the mechanism and control of strong ground pressure in the mining of shallow buried close-distance coal seam passing through the loess hilly region

Study on the mechanism and control of strong ground pressure in the mining of shallow buried close-distance coal seam passing through the loess hilly region

Isolated Overburden Grout Injection Technology Mining and Grouting Parameters Discussion and Redesign

Isolated overburden grout injection technology mining and grouting parameters discussion and optimization

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